add code

2 years ago · ddaa193821
commit ddaa193821
130 changed files with 29457 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,3 @@
+.idea/
+build
+cmake-build-*
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -0,0 +1,6 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(geiger)
--- a/8
+++ b/8
@ -0,0 +1,8 @@
+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := fanctl
+
+include $(IDF_PATH)/make/project.mk
--- a/components/common_utils/CMakeLists.txt
+++ b/components/common_utils/CMakeLists.txt
@ -0,0 +1,8 @@
+set(COMPONENT_ADD_INCLUDEDIRS include)
+
+set(COMPONENT_SRCDIRS
+        "src")
+
+#set(COMPONENT_REQUIRES)
+
+register_component()
--- a/components/common_utils/README.txt
+++ b/components/common_utils/README.txt
@ -0,0 +1,2 @@
+General purpose, mostly platofrm-idependent utilities
+that may be used by other components.
--- a/components/common_utils/component.mk
+++ b/components/common_utils/component.mk
@ -0,0 +1,3 @@
+
+COMPONENT_SRCDIRS := src
+COMPONENT_ADD_INCLUDEDIRS := include
--- a/components/common_utils/include/common_utils/base16.h
+++ b/components/common_utils/include/common_utils/base16.h
@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef BASE16_H_
+#define BASE16_H_
+
+#include <stdint.h>
+#include <string.h>
+
+/**
+ * Calculate length of base16-encoded data
+ * @param raw_len Raw data length
+ * @return Encoded string length (excluding NUL)
+ */
+static inline size_t base16_encoded_len(size_t raw_len) {
+	return (2 * raw_len);
+}
+
+/**
+ * Calculate maximum length of base16-decoded string
+ * @param encoded Encoded string
+ * @return Maximum length of raw data
+ */
+static inline size_t base16_decoded_max_len(const char *encoded) {
+	return ((strlen(encoded) + 1) / 2);
+}
+
+/**
+ * Base16-encode data
+ *
+ * The buffer must be the correct length for the encoded string.  Use
+ * something like
+ *
+ *     char buf[ base16_encoded_len ( len ) + 1 ];
+ *
+ * (the +1 is for the terminating NUL) to provide a buffer of the
+ * correct size.
+ *
+ * @param raw Raw data
+ * @param len Length of raw data
+ * @param encoded Buffer for encoded string
+ */
+extern void base16_encode(uint8_t *raw, size_t len, char *encoded);
+
+/**
+ * Base16-decode data
+ *
+ * The buffer must be large enough to contain the decoded data.  Use
+ * something like
+ *
+ *     char buf[ base16_decoded_max_len ( encoded ) ];
+ *
+ * to provide a buffer of the correct size.
+ * @param encoded Encoded string
+ * @param raw Raw data
+ * @return Length of raw data, or negative error
+ */
+extern int base16_decode(const char *encoded, uint8_t *raw);
+
+#endif /* BASE16_H_ */
--- a/components/common_utils/include/common_utils/datetime.h
+++ b/components/common_utils/include/common_utils/datetime.h
@ -0,0 +1,131 @@
+/**
+ * TODO file description
+ * 
+ * Created on 2019/09/13.
+ */
+
+#ifndef CSPEMU_DATETIME_H
+#define CSPEMU_DATETIME_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+enum weekday {
+    MONDAY = 1,
+    TUESDAY,
+    WEDNESDAY,
+    THURSDAY,
+    FRIDAY,
+    SATURDAY,
+    SUNDAY
+};
+_Static_assert(MONDAY==1, "enum weekday numbering Mon");
+_Static_assert(SUNDAY==7, "enum weekday numbering Sun");
+
+enum month {
+    JANUARY = 1,
+    FEBRUARY,
+    MARCH,
+    APRIL,
+    MAY,
+    JUNE,
+    JULY,
+    AUGUST,
+    SEPTEMBER,
+    OCTOBER,
+    NOVEMBER,
+    DECEMBER
+};
+_Static_assert(JANUARY==1, "enum month numbering Jan");
+_Static_assert(DECEMBER==12, "enum month numbering Dec");
+
+/** Abbreviated weekday names */
+extern const char *DT_WKDAY_NAMES[];
+/** Full-length weekday names */
+extern const char *DT_WKDAY_NAMES_FULL[];
+/** Abbreviated month names */
+extern const char *DT_MONTH_NAMES[];
+/** Full-length month names */
+extern const char *DT_MONTH_NAMES_FULL[];
+
+typedef struct datetime {
+    uint16_t year;
+    enum month month;
+    uint8_t day;
+    uint8_t hour;
+    uint8_t min;
+    uint8_t sec;
+    enum weekday wkday; // 1=monday
+} datetime_t;
+
+// Templates for printf
+#define DT_FORMAT_DATE   "%d/%d/%d"
+#define DT_SUBS_DATE(dt) (dt).year, (dt).month, (dt).day
+
+#define DT_FORMAT_TIME   "%d:%02d:%02d"
+#define DT_SUBS_TIME(dt) (dt).hour, (dt).min, (dt).sec
+
+#define DT_FORMAT_DATE_WK   DT_FORMAT_WK " " DT_FORMAT_DATE
+#define DT_SUBS_DATE_WK(dt) DT_SUBS_WK(dt), DT_SUBS_DATE(dt)
+
+#define DT_FORMAT_WK   "%s"
+#define DT_SUBS_WK(dt) DT_WKDAY_NAMES[(dt).wkday]
+
+#define DT_FORMAT_DATE_TIME   DT_FORMAT_DATE " " DT_FORMAT_TIME
+#define DT_SUBS_DATE_TIME(dt) DT_SUBS_DATE(dt), DT_SUBS_TIME(dt)
+
+#define DT_FORMAT   DT_FORMAT_DATE_WK " " DT_FORMAT_TIME
+#define DT_SUBS(dt) DT_SUBS_DATE_WK(dt), DT_SUBS_TIME(dt)
+
+// base century for two-digit year conversions
+#define DT_CENTURY 2000
+// start year for weekday computation
+#define DT_START_YEAR 2019
+// January 1st weekday of DT_START_YEAR
+#define DT_START_WKDAY TUESDAY
+// max date supported by 2-digit year RTC counters (it can't check Y%400==0 with only two digits)
+#define DT_END_YEAR 2399
+
+typedef union __attribute__((packed)) {
+    struct __attribute__((packed)) {
+        uint8_t ones : 4;
+        uint8_t tens : 4;
+    };
+    uint8_t byte;
+} bcd_t;
+_Static_assert(sizeof(bcd_t) == 1, "Bad bcd_t len");
+
+/** Check if a year is leap */
+static inline bool is_leap_year(int year)
+{
+    return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
+}
+
+/**
+ * Check if a datetime could be valid (ignores leap years)
+ *
+ * @param[in] dt
+ * @return basic validations passed
+ */
+bool datetime_is_valid(const datetime_t *dt);
+
+/**
+ * Set weekday based on a date in a given datetime
+ *
+ * @param[in,out] dt
+ * @return success
+ */
+bool datetime_set_weekday(datetime_t *dt);
+
+/**
+ * Get weekday for given a date
+ *
+ * @param year - year number
+ * @param month - 1-based month number
+ * @param day - 1-based day number
+ * @return weekday
+ */
+enum weekday date_weekday(uint16_t year, enum month month, uint8_t day);
+
+
+#endif //CSPEMU_DATETIME_H
--- a/components/common_utils/include/common_utils/hexdump.h
+++ b/components/common_utils/include/common_utils/hexdump.h
@ -0,0 +1,19 @@
+/**
+ * @file
+ * @brief A simple way of dumping memory to a hex output
+ *
+ * \addtogroup Hexdump
+ *
+ * @{
+ */
+
+
+#include <stdio.h>
+
+#define HEX_DUMP_LINE_BUFF_SIZ  16
+
+extern void hex_dump(FILE * fp,void *src, int len);
+extern void hex_dump_buff_line(FILE *fp, int addr_size, unsigned pos, char *line, unsigned len);
+/**
+ * }@
+ */
--- a/components/common_utils/include/common_utils/utils.h
+++ b/components/common_utils/include/common_utils/utils.h
@ -0,0 +1,80 @@
+/**
+ * General purpose, platform agnostic, reusable utils
+ */
+
+#ifndef COMMON_UTILS_UTILS_H
+#define COMMON_UTILS_UTILS_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "base16.h"
+#include "datetime.h"
+#include "hexdump.h"
+
+/** Convert a value to BCD struct */
+static inline bcd_t num2bcd(uint8_t value)
+{
+    return (bcd_t) {.ones=value % 10, .tens=value / 10};
+}
+
+/** Convert unpacked BCD to value */
+static inline uint8_t bcd2num(uint8_t tens, uint8_t ones)
+{
+    return tens * 10 + ones;
+}
+
+/**
+ * Append to a buffer.
+ *
+ * In case the buffer capacity is reached, it stays unchanged (up to the terminator) and NULL is returned.
+ *
+ * @param buf - buffer position to append at; if NULL is given, the function immediately returns NULL.
+ * @param appended - string to append
+ * @param pcap - pointer to a capacity variable
+ * @return the new end of the string (null byte); use as 'buf' for following appends
+ */
+char *append(char *buf, const char *appended, size_t *pcap);
+
+/**
+ * Test if a file descriptor is valid (e.g. when cleaning up after a failed select)
+ *
+ * @param fd - file descriptor number
+ * @return is valid
+ */
+bool fd_is_valid(int fd);
+
+/**
+ * parse user-provided string as boolean
+ *
+ * @param str
+ * @return 0 false, 1 true, -1 invalid
+ */
+int parse_boolean_arg(const char *str);
+
+/** Check equality of two strings; returns bool */
+#define streq(a, b) (strcmp((const char*)(a), (const char*)(b)) == 0)
+
+/** Check prefix equality of two strings; returns bool */
+#define strneq(a, b, n) (strncmp((const char*)(a), (const char*)(b), (n)) == 0)
+
+/** Check if a string starts with a substring; returns bool */
+#define strstarts(a, b) strneq((a), (b), (int)strlen((b)))
+
+#ifndef MIN
+/** Get min of two numbers */
+#define MIN(a, b) ((a) > (b) ? (b) : (a))
+#endif
+
+#ifndef MAX
+/** Get max of two values */
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+
+#ifndef STR
+#define STR_HELPER(x) #x
+/** Stringify a token */
+#define STR(x) STR_HELPER(x)
+#endif
+
+#endif //COMMON_UTILS_UTILS_H
--- a/components/common_utils/src/base16.c
+++ b/components/common_utils/src/base16.c
@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <esp_log.h>
+
+static const char *TAG = "base16";
+
+void base16_encode(uint8_t *raw, size_t len, char *encoded) {
+	uint8_t *raw_bytes = raw;
+	char *encoded_bytes = encoded;
+	size_t remaining = len;
+
+	for (; remaining--; encoded_bytes += 2)
+		snprintf(encoded_bytes, 3, "%02X", *(raw_bytes++));
+
+}
+
+int base16_decode(const char *encoded, uint8_t *raw) {
+	const char *encoded_bytes = encoded;
+	uint8_t *raw_bytes = raw;
+	char buf[3];
+	char *endp;
+	size_t len;
+
+	while (encoded_bytes[0]) {
+		if (!encoded_bytes[1]) {
+			ESP_LOGE(TAG, "Base16-encoded string \"%s\" has invalid length\n",
+					encoded);
+			return -22;
+		}
+		memcpy(buf, encoded_bytes, 2);
+		buf[2] = '\0';
+		*(raw_bytes++) = strtoul(buf, &endp, 16);
+		if (*endp != '\0') {
+			ESP_LOGE(TAG,"Base16-encoded string \"%s\" has invalid byte \"%s\"\n",
+					encoded, buf);
+			return -22;
+		}
+		encoded_bytes += 2;
+	}
+	len = (raw_bytes - raw);
+	return (len);
+}
--- a/components/common_utils/src/common_utils.c
+++ b/components/common_utils/src/common_utils.c
@ -0,0 +1,52 @@
+#include <stdint.h>
+#include <string.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "common_utils/utils.h"
+
+char *append(char *buf, const char *appended, size_t *pcap)
+{
+    char c;
+    char *buf0 = buf;
+    size_t cap = *pcap;
+
+    if (buf0 == NULL) return NULL;
+    if (appended == NULL || appended[0] == 0) return buf0;
+
+    while (cap > 1 && 0 != (c = *appended++)) {
+        *buf++ = c;
+        cap--;
+    }
+    if (cap == 0) {
+        *buf0 = '\0';
+        return NULL;
+    }
+
+    *pcap = cap;
+    *buf = 0;
+    return buf;
+}
+
+bool fd_is_valid(int fd)
+{
+    return fcntl(fd, F_GETFD) != -1 || errno != EBADF;
+}
+
+int parse_boolean_arg(const char *str)
+{
+    if (0 == strcasecmp(str, "on")) return 1;
+    if (strstarts(str, "en")) return 1;
+    if (strstarts(str, "y")) return 1;
+    if (0 == strcmp(str, "1")) return 1;
+    if (0 == strcasecmp(str, "a")) return 1;
+
+    if (0 == strcasecmp(str, "off")) return 0;
+    if (0 == strcmp(str, "0")) return 0;
+    if (strstarts(str, "dis")) return 0;
+    if (strstarts(str, "n")) return 0;
+
+    return -1;
+}
+
--- a/components/common_utils/src/datetime.c
+++ b/components/common_utils/src/datetime.c
@ -0,0 +1,110 @@
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "common_utils/datetime.h"
+
+const char *DT_WKDAY_NAMES[] = {
+    [MONDAY] = "Mon",
+    [TUESDAY] = "Tue",
+    [WEDNESDAY] = "Wed",
+    [THURSDAY] = "Thu",
+    [FRIDAY] = "Fri",
+    [SATURDAY] = "Sat",
+    [SUNDAY] = "Sun"
+};
+
+const char *DT_WKDAY_NAMES_FULL[] = {
+    [MONDAY] = "Monday",
+    [TUESDAY] = "Tuesday",
+    [WEDNESDAY] = "Wednesday",
+    [THURSDAY] = "Thursday",
+    [FRIDAY] = "Friday",
+    [SATURDAY] = "Saturday",
+    [SUNDAY] = "Sunday"
+};
+
+const char *DT_MONTH_NAMES[] = {
+    [JANUARY] = "Jan",
+    [FEBRUARY] = "Feb",
+    [MARCH] = "Mar",
+    [APRIL] = "Apr",
+    [MAY] = "May",
+    [JUNE] = "Jun",
+    [JULY] = "Jul",
+    [AUGUST] = "Aug",
+    [SEPTEMBER] = "Sep",
+    [OCTOBER] = "Oct",
+    [NOVEMBER] = "Nov",
+    [DECEMBER] = "Dec"
+};
+
+const char *DT_MONTH_NAMES_FULL[] = {
+    [JANUARY] = "January",
+    [FEBRUARY] = "February",
+    [MARCH] = "March",
+    [APRIL] = "April",
+    [MAY] = "May",
+    [JUNE] = "June",
+    [JULY] = "July",
+    [AUGUST] = "August",
+    [SEPTEMBER] = "September",
+    [OCTOBER] = "October",
+    [NOVEMBER] = "November",
+    [DECEMBER] = "December"
+};
+
+static const uint16_t MONTH_LENGTHS[] = { /* 1-based, normal year */
+    [JANUARY]=31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+_Static_assert(sizeof(MONTH_LENGTHS) / sizeof(uint16_t) == 13, "Months array length");
+
+static const uint16_t MONTH_YEARDAYS[] = { /* 1-based */
+    [JANUARY]=0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 // // days until 1st of month
+};
+_Static_assert(sizeof(MONTH_YEARDAYS) / sizeof(uint16_t) == 13, "Months array length");
+
+_Static_assert(MONDAY < SUNDAY, "Weekday ordering");
+
+bool datetime_is_valid(const datetime_t *dt)
+{
+    if (dt == NULL) return false;
+
+    // check month first to avoid out-of-bounds read from the MONTH_LENGTHS table
+    if (!(dt->month >= JANUARY && dt->month <= DECEMBER)) return false;
+
+    int monthlen = MONTH_LENGTHS[dt->month];
+    if (dt->month == FEBRUARY && is_leap_year(dt->year)) {
+        monthlen = 29;
+    }
+
+    return dt->sec < 60 &&
+           dt->min < 60 &&
+           dt->hour < 24 &&
+           dt->wkday >= MONDAY &&
+           dt->wkday <= SUNDAY &&
+           dt->year >= DT_START_YEAR &&
+           dt->year <= DT_END_YEAR &&
+           dt->day >= 1 &&
+           dt->day <= monthlen;
+}
+
+bool datetime_set_weekday(datetime_t *dt)
+{
+    dt->wkday = MONDAY; // prevent the validator func erroring out on invalid weekday
+    if (!datetime_is_valid(dt)) return false;
+    dt->wkday = date_weekday(dt->year, dt->month, dt->day);
+    return true;
+}
+
+enum weekday date_weekday(uint16_t year, enum month month, uint8_t day)
+{
+    uint16_t days = (DT_START_WKDAY - MONDAY) + (year - DT_START_YEAR) * 365 + MONTH_YEARDAYS[month] + (day - 1);
+
+    for (uint16_t i = DT_START_YEAR; i <= year; i++) {
+        if (is_leap_year(i) && (i < year || month > FEBRUARY)) days++;
+    }
+
+    return MONDAY + days % 7;
+}
+
--- a/components/common_utils/src/hexdump.c
+++ b/components/common_utils/src/hexdump.c
@ -0,0 +1,72 @@
+/*
+ * util.c
+ *
+ *  Created on: Aug 12, 2009
+ *      Author: johan
+ */
+
+// adapted from libgomspace
+
+#include <string.h>
+#include <stdio.h>
+#include "common_utils/hexdump.h"
+
+
+//! Dump memory to debugging output
+/**
+ * Dumps a chunk of memory to the screen
+ */
+void hex_dump(FILE * fp, void *src, int len) {
+	int i, j=0, k;
+	char text[17];
+
+	text[16] = '\0';
+	//printf("Hex dump:\r\n");
+	fprintf(fp, "%p : ", src);
+	for(i=0; i<len; i++) {
+		j++;
+		fprintf(fp, "%02X ", ((volatile unsigned char *)src)[i]);
+		if(j == 8)
+			fputc(' ', fp);
+		if(j == 16) {
+			j = 0;
+			memcpy(text, &((char *)src)[i-15], 16);
+			for(k=0; k<16; k++) {
+				if((text[k] < 32) || (text[k] > 126)) {
+					text[k] = '.';
+				}
+			}
+			fprintf(fp, " |%s|\n\r", text);
+			if(i<len-1) {
+				fprintf(fp, "%p : ", src+i+1);
+			}
+		}
+	}
+	if (i % 16)
+		fprintf(fp, "\r\n");
+}
+
+void hex_dump_buff_line(FILE *fp, int addr_size, unsigned pos, char *line, unsigned len)
+{
+  unsigned i;
+
+  fprintf(fp, "%0*x", addr_size, pos);
+  for (i = 0; i < HEX_DUMP_LINE_BUFF_SIZ; i++)
+  {
+    if (!(i % 8))
+      fputc(' ', fp);
+    if (i < len)
+      fprintf(fp, " %02x", (unsigned char)line[i]);
+    else
+	  fputs("   ", fp);
+  }
+  fputs("  |", fp);
+  for (i = 0; i < HEX_DUMP_LINE_BUFF_SIZ && i < len; i++)
+  {
+    if (line[i] >= 32 && line[i] <= 126)
+      fprintf(fp, "%c", (unsigned char)line[i]);
+    else
+		fputc('.', fp);
+  }
+  fputs("|\r\n", fp);
+}
--- a/components/dhcp_wd/CMakeLists.txt
+++ b/components/dhcp_wd/CMakeLists.txt
@ -0,0 +1,9 @@
+set(COMPONENT_ADD_INCLUDEDIRS
+        "include")
+
+set(COMPONENT_SRCDIRS
+        "src")
+
+set(COMPONENT_REQUIRES ping tcpip_adapter)
+
+register_component()
--- a/components/dhcp_wd/Kconfig
+++ b/components/dhcp_wd/Kconfig
@ -0,0 +1,27 @@
+menu "DHCP watchdog"
+
+config DHCPWD_PERIOD_GW_PING_S
+    int "Connectivity test interval (s)"
+    default 60
+    help
+      Time between two connectivity tests (gateway ping)
+
+config DHCPWD_GETIP_TIMEOUT_S
+    int "Timeout to get IP (s)"
+    default 10
+    help
+      Timeout after establishing connection to get an IP address from the DHCP server.
+
+config DHCPWD_TASK_STACK_SIZE
+    int "Task stack size (bytes)"
+    default 4096
+    help
+      DHCP watchdog task stack size
+
+config DHCPWD_TASK_PRIORITY
+    int "Task priority"
+    default 3
+    help
+      DHCP watchdog task priority
+
+endmenu
--- a/components/dhcp_wd/README.txt
+++ b/components/dhcp_wd/README.txt
@ -0,0 +1,5 @@
+DHCP ping watchdog.
+
+ESP32 sometimes loses wireless connectivity (expiring lease that fails to renew,
+AP rebooting and forgetting us, etc). This module periodically pings the gateway
+and triggers reconnect if the ping fails.
--- a/components/dhcp_wd/component.mk
+++ b/components/dhcp_wd/component.mk
@ -0,0 +1,3 @@
+
+COMPONENT_SRCDIRS := src
+COMPONENT_ADD_INCLUDEDIRS := include
--- a/components/dhcp_wd/include/dhcp_wd.h
+++ b/components/dhcp_wd/include/dhcp_wd.h
@ -0,0 +1,82 @@
+/**
+ * DHCP watchdog
+ *
+ * This is a workaround for a rare case where we don't get
+ * any IP after connecting with STA. If it takes too long,
+ * try power-cycling the DHCP client. If that fails too,
+ * try cycling the WiFi stack too.
+ *
+ * This does not try to reboot, as there are valid cases when this
+ * can happen - e.g. no DHCP on the network + no static IP configured yet.
+ *
+ * The ping component is used as a dependency.
+ */
+
+#ifndef _DHCP_WD_H_
+#define _DHCP_WD_H_
+
+#include "esp_netif.h"
+#include "esp_event.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+typedef struct dhcp_wd_instance * dhcp_wd_handle_t;
+
+/**
+ * Start the watchdog. Handle must remain valid until the task is deleted.
+ *
+ * @param[in] iface
+ * @param[out] handle - pointer to a handle variable (will be written to it)
+ * @return success
+ */
+esp_err_t dhcp_watchdog_start(esp_netif_t * netif, bool is_wifi, dhcp_wd_handle_t *pHandle);
+
+/**
+ * Check if a watchdog is running
+ *
+ * @param[in] handle
+ * @return is running
+ */
+bool dhcp_watchdog_is_running(dhcp_wd_handle_t handle);
+
+/**
+ * Stop the watchdog and free resources.
+ * The handle becomes invalid and is set to NULL.
+ *
+ * @param[in] handle
+ * @return success
+ */
+esp_err_t dhcp_watchdog_stop(dhcp_wd_handle_t *pHandle);
+
+enum dhcp_wd_event {
+    DHCP_WD_NOTIFY_CONNECTED,
+    DHCP_WD_NOTIFY_DISCONNECTED,
+    DHCP_WD_NOTIFY_GOT_IP,
+};
+
+/**
+ * @brief Notify the watchdog task about a wifi state change
+ *
+ * Call this from the WiFi event handler.
+ *
+ * @param[in] handle
+ * @param[in] event - detected event
+ */
+esp_err_t dhcp_watchdog_notify(dhcp_wd_handle_t handle, enum dhcp_wd_event);
+
+enum dhcp_wd_test_result {
+    DHCP_WD_RESULT_OK = 0,
+    DHCP_WD_RESULT_PING_LOST,
+    DHCP_WD_RESULT_NO_GATEWAY,
+};
+
+/**
+ * Manually trigger a connection test by pinging the gateway.
+ * This is independent on any watchdog tasks and can be run without starting the watchdog.
+ *
+ * @param[in] iface - network interface, typically TCPIP_ADAPTER_IF_STA
+ * @return test result
+ */
+enum dhcp_wd_test_result dhcp_wd_test_connection(esp_netif_t *iface);
+
+#endif //_DHCP_WD_H_
--- a/components/dhcp_wd/src/dhcp_wd.c
+++ b/components/dhcp_wd/src/dhcp_wd.c
@ -0,0 +1,277 @@
+#include <string.h>
+#include "esp_log.h"
+#include "dhcp_wd.h"
+#include "esp_wifi.h"
+//#include "esp_eth.h"
+#include "ping.h"
+
+#define xstr(s) str(s)
+#define str(s) #s
+
+#define PERIOD_GW_PING_S  CONFIG_DHCPWD_PERIOD_GW_PING_S
+#define GETIP_TIMEOUT_S   CONFIG_DHCPWD_GETIP_TIMEOUT_S
+#define TASK_STACK_SIZE   CONFIG_DHCPWD_TASK_STACK_SIZE
+#define TASK_PRIO         CONFIG_DHCPWD_TASK_PRIORITY
+
+static const char *TAG = "dhcp_wd";
+
+static void dhcp_watchdog_task(void *parm);
+
+struct dhcp_wd_instance {
+    TaskHandle_t task;
+    esp_netif_t * iface;
+    bool is_wifi;
+    bool running;
+};
+
+#define STATES_ENUM \
+    X(DISCONECTED) \
+    X(CONECTED_WAIT_IP) \
+    X(CONECTED_WAIT_IP2) \
+    X(CONECTED)
+
+enum dhcp_wd_state {
+#undef X
+#define X(s) STATE_##s,
+    STATES_ENUM
+};
+
+const char *state_names[] = {
+#undef X
+#define X(s) xstr(s),
+    STATES_ENUM
+};
+
+enum dhcp_wd_notify {
+    NOTIFY_CONNECTED = BIT0,
+    NOTIFY_DISCONNECTED = BIT1,
+    NOTIFY_GOT_IP = BIT2,
+    NOTIFY_SHUTDOWN = BIT3, // kills the task
+};
+
+/** Send a notification to the watchdog task */
+esp_err_t dhcp_watchdog_notify(dhcp_wd_handle_t handle, const enum dhcp_wd_event event)
+{
+    assert(handle != NULL);
+    assert(handle->task != NULL);
+
+    uint32_t flag = 0;
+
+    switch (event) {
+        case DHCP_WD_NOTIFY_CONNECTED:
+            flag = NOTIFY_CONNECTED;
+            break;
+
+        case DHCP_WD_NOTIFY_DISCONNECTED:
+            flag = NOTIFY_DISCONNECTED;
+            break;
+
+        case DHCP_WD_NOTIFY_GOT_IP:
+            flag = NOTIFY_GOT_IP;
+            break;
+
+        default:
+            break;
+    }
+
+    BaseType_t ret = pdPASS;
+    if (flag != 0) {
+        ret = xTaskNotify(handle->task, flag, eSetBits);
+    }
+
+    return (pdPASS == ret) ? ESP_OK : ESP_FAIL;
+}
+
+/**
+ * Start the watchdog
+ */
+esp_err_t dhcp_watchdog_start(esp_netif_t * netif, bool is_wifi, dhcp_wd_handle_t *pHandle)
+{
+    assert(pHandle != NULL);
+
+    dhcp_wd_handle_t handle = calloc(1, sizeof(struct dhcp_wd_instance));
+    if (!handle) return ESP_ERR_NO_MEM;
+    *pHandle = handle;
+
+    handle->iface = netif;
+    handle->is_wifi = is_wifi;
+
+    BaseType_t ret = xTaskCreate(dhcp_watchdog_task, "dhcp-wd", TASK_STACK_SIZE, (void *)handle, TASK_PRIO, &handle->task);
+    handle->running = true;
+
+    return (pdPASS == ret) ? ESP_OK : ESP_FAIL;
+}
+
+/**
+ * Check if a watchdog is still running
+ *
+ * @param handle
+ * @return is running
+ */
+bool dhcp_watchdog_is_running(dhcp_wd_handle_t handle)
+{
+    return handle->running;
+}
+
+/**
+ * Stop the watchdog and free resources
+ */
+esp_err_t dhcp_watchdog_stop(dhcp_wd_handle_t *pHandle)
+{
+    assert(pHandle != NULL);
+    assert(*pHandle != NULL);
+    xTaskNotify((*pHandle)->task, NOTIFY_SHUTDOWN, eSetBits);
+    *pHandle = NULL;
+    return ESP_OK;
+}
+
+/**
+ * @param parm - tcpip_adapter_if_t iface (cast to void *) - typically TCPIP_ADAPTER_IF_STA
+ */
+static void dhcp_watchdog_task(void *parm)
+{
+    enum dhcp_wd_state state = STATE_DISCONECTED;
+
+    dhcp_wd_handle_t handle = parm;
+    assert(handle != NULL);
+    assert(handle->iface != NULL);
+
+    ESP_LOGI(TAG, "Watchdog started");
+
+    while (1) {
+        uint32_t flags = 0;
+        uint32_t wait_s;
+        TickType_t waittime;
+
+        switch (state) {
+            case STATE_DISCONECTED:
+                wait_s = waittime = portMAX_DELAY;
+                break;
+
+            case STATE_CONECTED_WAIT_IP:
+            case STATE_CONECTED_WAIT_IP2:
+                wait_s = GETIP_TIMEOUT_S;
+                waittime = (GETIP_TIMEOUT_S * 1000) / portTICK_PERIOD_MS;
+                break;
+
+            case STATE_CONECTED:
+                wait_s = PERIOD_GW_PING_S;
+                waittime = (PERIOD_GW_PING_S * 1000) / portTICK_PERIOD_MS;
+                break;
+
+            default:
+                assert(0);
+        }
+
+        ESP_LOGD(TAG, "State %s, wait %d s", state_names[state], wait_s);
+        BaseType_t rv = xTaskNotifyWait(
+            /* no clear on entry */ pdFALSE,
+            /* clear all on exit */ ULONG_MAX,
+                                    &flags, waittime);
+
+        if (rv == pdPASS) {
+            // the order here is important in case we get multiple events at once
+
+            if (flags & NOTIFY_DISCONNECTED) {
+                state = STATE_DISCONECTED;
+            }
+
+            if (flags & NOTIFY_CONNECTED) {
+                state = STATE_CONECTED_WAIT_IP;
+            }
+
+            if (flags & NOTIFY_GOT_IP) {
+                state = STATE_CONECTED;
+            }
+
+            if (flags & NOTIFY_SHUTDOWN) {
+                // kill self
+                handle->running = false;
+                free(handle);
+                vTaskDelete(NULL);
+                return;
+            }
+        } else {
+            // a timeout occurred
+
+            switch (state) {
+                case STATE_DISCONECTED:
+                    // this shouldn't happen, we have infinite delay waiting for disconnected
+                    ESP_LOGW(TAG, "dhcp_wd double discon evt");
+                    break;
+
+                case STATE_CONECTED_WAIT_IP:
+                    ESP_LOGW(TAG, "Get IP timeout, restarting DHCP client");
+                    // this is a bit suspicious
+                    // try to restart the DHCPC client
+                    ESP_ERROR_CHECK(esp_netif_dhcpc_stop(handle->iface));
+                    ESP_ERROR_CHECK(esp_netif_dhcpc_start(handle->iface));
+                    state = STATE_CONECTED_WAIT_IP2;
+                    break;
+
+                case STATE_CONECTED_WAIT_IP2:
+                    ESP_LOGW(TAG, "Get IP timeout 2, restarting network stack");
+                    // well now this is weird. try flipping the whole WiFi/Eth stack
+                    if (handle->is_wifi) {
+                        ESP_ERROR_CHECK(esp_wifi_disconnect());
+                    }
+                    // this will trigger the disconnected event and loop back into Disconnected
+                    // the disconnect event handler calls connect again
+                    state = STATE_DISCONECTED;
+                    break;
+
+                case STATE_CONECTED: {
+                    // Ping gateway to check if we're still connected
+                    enum dhcp_wd_test_result result = dhcp_wd_test_connection(handle->iface);
+
+                    if (result == DHCP_WD_RESULT_PING_LOST) {
+                        // looks like the gateway silently dropped us
+                        // try kicking the DHCP client, if it helps
+                        ESP_ERROR_CHECK(esp_netif_dhcpc_stop(handle->iface));
+                        ESP_ERROR_CHECK(esp_netif_dhcpc_start(handle->iface));
+                        state = STATE_CONECTED_WAIT_IP2;
+                        // if not, it'll flip the whole wifi stack
+                    } else {
+                        ESP_LOGD(TAG, "Gateway ping OK");
+                    }
+                    break;
+                }
+            }
+        }
+    }
+}
+
+enum dhcp_wd_test_result dhcp_wd_test_connection(esp_netif_t *iface)
+{
+    ESP_LOGD(TAG, "Ping Gateway to check if IP is valid");
+
+    ping_opts_t opts = PING_CONFIG_DEFAULT();
+    opts.count = 3;
+    opts.interval_ms = 0;
+    opts.timeout_ms = 1000;
+
+    esp_netif_ip_info_t ip_info = {};
+    ESP_ERROR_CHECK(esp_netif_get_ip_info(iface, &ip_info));
+
+    opts.ip_addr.addr = ip_info.gw.addr;
+
+    ping_result_t result = {};
+
+    if (ip_info.gw.addr != 0) {
+        esp_err_t ret = ping(&opts, &result);
+        if (ret != ESP_OK) {
+            ESP_LOGW(TAG, "Ping error");
+            return DHCP_WD_RESULT_PING_LOST;
+        }
+        ESP_LOGD(TAG, "Ping result: %d tx, %d rx", result.sent, result.received);
+        if (result.received == 0) {
+            ESP_LOGW(TAG, "Failed to ping GW");
+            return DHCP_WD_RESULT_PING_LOST;
+        } else {
+            return DHCP_WD_RESULT_OK;
+        }
+    } else {
+        ESP_LOGW(TAG, "No GW IP to ping");
+        return DHCP_WD_RESULT_NO_GATEWAY;
+    }
+}
--- a/components/esp32-ds18b20/.travis.yml
+++ b/components/esp32-ds18b20/.travis.yml
@ -0,0 +1,39 @@
+# Build and deploy doxygen documention to GitHub Pages
+sudo: false
+dist: trusty
+
+# Blacklist
+branches:
+  only:
+    - master
+
+# Environment variables
+env:
+  global:
+    - GH_REPO_REF: github.com/DavidAntliff/esp32-ds18b20.git
+
+# Install dependencies
+addons:
+  apt:
+    packages:
+      - doxygen
+      - doxygen-doc
+      - doxygen-latex
+      - doxygen-gui
+      - graphviz
+
+# Build the docs
+script:
+  - cd doc
+  - doxygen
+
+# Deploy using Travis-CI/GitHub Pages integration support
+deploy:
+  provider: pages
+  skip-cleanup: true
+  local-dir: doc/html
+  github-token: $GITHUB_TOKEN
+  on:
+    branch: master
+  target-branch: gh-pages
+
--- a/components/esp32-ds18b20/CMakeLists.txt
+++ b/components/esp32-ds18b20/CMakeLists.txt
@ -0,0 +1,6 @@
+set(COMPONENT_ADD_INCLUDEDIRS include)
+set(COMPONENT_SRCS "ds18b20.c")
+set(COMPONENT_PRIV_REQUIRES "esp32-owb")
+register_component()
+
+
--- a/components/esp32-ds18b20/LICENSE
+++ b/components/esp32-ds18b20/LICENSE
@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 David Antliff
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/components/esp32-ds18b20/README.md
+++ b/components/esp32-ds18b20/README.md
@ -0,0 +1,98 @@
+# esp32-ds18b20
+
+## Introduction
+
+This is a ESP32-compatible C component for the Maxim Integrated DS18B20 Programmable Resolution 1-Wire Digital
+Thermometer device.
+
+It supports multiple devices on the same 1-Wire bus.
+
+It is written and tested for v2.1, v3.0-3.3 and v4.1-beta1 of the [ESP-IDF](https://github.com/espressif/esp-idf) 
+environment, using the xtensa-esp32-elf toolchain (gcc version 5.2.0).
+
+## Dependencies
+
+Requires [esp32-owb](https://github.com/DavidAntliff/esp32-owb).
+
+## Example
+
+See [esp32-ds18b20-example](https://github.com/DavidAntliff/esp32-ds18b20-example) for an example that supports single
+and multiple devices on a single bus.
+
+## Features
+
+In cooperation with the underlying esp32-owb component, this component includes:
+
+ * External power supply mode.
+ * Parasitic power mode (VDD and GND connected) - see notes below.
+ * Static (stack-based) or dynamic (malloc-based) memory model.
+ * No globals - support any number of DS18B20 devices on any number of 1-Wire buses simultaneously.
+ * 1-Wire device detection and validation, including search for multiple devices on a single bus.
+ * Addressing optimisation for a single (solo) device on a bus.
+ * CRC checks on temperature data.
+ * Programmable temperature measurement resolution (9, 10, 11 or 12-bit resolution).
+ * Temperature conversion and retrieval.
+ * Separation of conversion and temperature retrieval to allow for simultaneous conversion across multiple devices.
+
+## Parasitic Power Mode
+
+Consult the [datasheet](http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf) for more detailed information about
+Parasitic Power mode.
+
+Parasitic power operation can be detected by `ds18b20_check_for_parasite_power()` followed by a call to
+`owb_use_parasitic_power()`, or simply set explicitly by a call to the latter.
+
+This library has been tested on the ESP32 with two parasitic-power configurations, with two DS18B20 devices at 3.3V:
+
+1. Disconnect power to each device's VDD pin, and connect that pin to GND for each device. Power is supplied to
+   each device through the OWB data line.
+2. Connect the OWB data line to VCC via a P-channel MOSFET (e.g. BS250) and current-limiting resistor (e.g. 270 Ohm).
+   Ensure your code calls `owb_use_strong_pullup_gpio()` with the GPIO connected to the MOSFET Gate. The GPIO will go
+   high during temperature conversion, turning on the MOSFET and providing power from VCC to each device through the OWB
+   data line.
+
+If you set up configuration 1 and do not see CRC errors, but you get incorrect temperature readings around 80 - 85 
+degrees C, then it is likely that your DS18B20 devices are running out of power during the temperature conversion. In 
+this case, consider reducing the value of the pull-up resistor. For example, I have had success obtaining correct
+conversions from two parasitic DS18B20 devices by replacing the 4k7 Ohm pull-up resistor with a 1 kOhm resistor.
+
+Alternatively, consider using configuration 2.
+
+Note that use of parasitic power mode disables the ability for devices on the bus to signal that an operation has 
+completed. This means that DS18B20 devices in parasitic power mode are not able to communicate when they have completed
+a temperature conversion. In this mode, a delay for a pre-calculated duration occurs, and then the conversion result is
+read from the device(s). *If your ESP32 is not running on the correct clock rate, this duration may be too short!*  
+
+## Documentation
+
+Automatically generated API documentation (doxygen) is available [here](https://davidantliff.github.io/esp32-ds18b20/index.html).
+
+## Source Code
+
+The source is available from [GitHub](https://www.github.com/DavidAntliff/esp32-ds18b20).
+
+## License
+
+The code in this project is licensed under the MIT license - see LICENSE for details.
+
+## Links
+
+ * [DS18B20 Datasheet](http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf)
+ * [1-Wire Communication Through Software](https://www.maximintegrated.com/en/app-notes/index.mvp/id/126)
+ * [1-Wire Search Algorithm](https://www.maximintegrated.com/en/app-notes/index.mvp/id/187)
+ * [Espressif IoT Development Framework for ESP32](https://github.com/espressif/esp-idf)
+
+## Acknowledgements
+
+Parts of this code are based on references provided to the public domain by Maxim Integrated.
+
+"1-Wire" is a registered trademark of Maxim Integrated.
+
+## Roadmap
+
+The following features are anticipated but not yet implemented:
+
+ * Concurrency support (multiple tasks accessing devices on the same bus).
+ * Alarm support.
+ * EEPROM support.
+ * Parasitic power support.
--- a/components/esp32-ds18b20/component.mk
+++ b/components/esp32-ds18b20/component.mk
@ -0,0 +1 @@
+# Use defaults
--- a/components/esp32-ds18b20/doc/.gitignore
+++ b/components/esp32-ds18b20/doc/.gitignore
@ -0,0 +1,3 @@
+html/
+latex/
+
--- a/components/esp32-ds18b20/doc/Doxyfile
+++ b/components/esp32-ds18b20/doc/Doxyfile
--- a/components/esp32-ds18b20/ds18b20.c
+++ b/components/esp32-ds18b20/ds18b20.c
@ -0,0 +1,614 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017-2019 David Antliff
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file ds18b20.c
+ *
+ * Resolution is cached in the DS18B20_Info object to avoid querying the hardware
+ * every time a temperature conversion is required. However this can result in the
+ * cached value becoming inconsistent with the hardware value, so care must be taken.
+ *
+ */
+
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <math.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/gpio.h"
+#include "esp_system.h"
+#include "esp_log.h"
+
+#include "ds18b20.h"
+#include "owb.h"
+
+static const char * TAG = "ds18b20";
+static const int T_CONV = 750;   // maximum conversion time at 12-bit resolution in milliseconds
+
+// Function commands
+#define DS18B20_FUNCTION_TEMP_CONVERT       0x44  ///< Initiate a single temperature conversion
+#define DS18B20_FUNCTION_SCRATCHPAD_WRITE   0x4E  ///< Write 3 bytes of data to the device scratchpad at positions 2, 3 and 4
+#define DS18B20_FUNCTION_SCRATCHPAD_READ    0xBE  ///< Read 9 bytes of data (including CRC) from the device scratchpad
+#define DS18B20_FUNCTION_SCRATCHPAD_COPY    0x48  ///< Copy the contents of the scratchpad to the device EEPROM
+#define DS18B20_FUNCTION_EEPROM_RECALL      0xB8  ///< Restore alarm trigger values and configuration data from EEPROM to the scratchpad
+#define DS18B20_FUNCTION_POWER_SUPPLY_READ  0xB4  ///< Determine if a device is using parasitic power
+
+/// @cond ignore
+typedef struct
+{
+    uint8_t temperature[2];    // [0] is LSB, [1] is MSB
+    uint8_t trigger_high;
+    uint8_t trigger_low;
+    uint8_t configuration;
+    uint8_t reserved[3];
+    uint8_t crc;
+} __attribute__((packed)) Scratchpad;
+/// @endcond ignore
+
+static void _init(DS18B20_Info * ds18b20_info, const OneWireBus * bus)
+{
+    if (ds18b20_info != NULL)
+    {
+        ds18b20_info->bus = bus;
+        memset(&ds18b20_info->rom_code, 0, sizeof(ds18b20_info->rom_code));
+        ds18b20_info->use_crc = false;
+        ds18b20_info->resolution = DS18B20_RESOLUTION_INVALID;
+        ds18b20_info->solo = false;   // assume multiple devices unless told otherwise
+        ds18b20_info->init = true;
+    }
+    else
+    {
+        ESP_LOGE(TAG, "ds18b20_info is NULL");
+    }
+}
+
+static bool _is_init(const DS18B20_Info * ds18b20_info)
+{
+    bool ok = false;
+    if (ds18b20_info != NULL)
+    {
+        if (ds18b20_info->init)
+        {
+            // OK
+            ok = true;
+        }
+        else
+        {
+            ESP_LOGE(TAG, "ds18b20_info is not initialised");
+        }
+    }
+    else
+    {
+        ESP_LOGE(TAG, "ds18b20_info is NULL");
+    }
+    return ok;
+}
+
+static bool _address_device(const DS18B20_Info * ds18b20_info)
+{
+    bool present = false;
+    if (_is_init(ds18b20_info))
+    {
+        owb_reset(ds18b20_info->bus, &present);
+        if (present)
+        {
+            if (ds18b20_info->solo)
+            {
+                // if there's only one device on the bus, we can skip
+                // sending the ROM code and instruct it directly
+                owb_write_byte(ds18b20_info->bus, OWB_ROM_SKIP);
+            }
+            else
+            {
+                // if there are multiple devices on the bus, a Match ROM command
+                // must be issued to address a specific slave
+                owb_write_byte(ds18b20_info->bus, OWB_ROM_MATCH);
+                owb_write_rom_code(ds18b20_info->bus, ds18b20_info->rom_code);
+            }
+        }
+        else
+        {
+            ESP_LOGE(TAG, "ds18b20 device not responding");
+        }
+    }
+    return present;
+}
+
+static bool _check_resolution(DS18B20_RESOLUTION resolution)
+{
+    return (resolution >= DS18B20_RESOLUTION_9_BIT) && (resolution <= DS18B20_RESOLUTION_12_BIT);
+}
+
+static float _wait_for_duration(DS18B20_RESOLUTION resolution)
+{
+    int64_t start_time = esp_timer_get_time();
+    if (_check_resolution(resolution))
+    {
+        int divisor = 1 << (DS18B20_RESOLUTION_12_BIT - resolution);
+        ESP_LOGD(TAG, "divisor %d", divisor);
+        float max_conversion_time = (float)T_CONV / (float)divisor;
+        int ticks = ceil(max_conversion_time / portTICK_PERIOD_MS);
+        ESP_LOGD(TAG, "wait for conversion: %.3f ms, %d ticks", max_conversion_time, ticks);
+
+        // wait at least this maximum conversion time
+        vTaskDelay(ticks);
+    }
+    int64_t end_time = esp_timer_get_time();
+    return (float)(end_time - start_time) / 1000000.0f;
+}
+
+static float _wait_for_device_signal(const DS18B20_Info * ds18b20_info)
+{
+    float elapsed_time = 0.0f;
+    if (_check_resolution(ds18b20_info->resolution))
+    {
+        int divisor = 1 << (DS18B20_RESOLUTION_12_BIT - ds18b20_info->resolution);
+
+        // allow for 10% overtime
+        float max_conversion_time = (float)T_CONV / (float)divisor * 1.1;
+        int max_conversion_ticks = ceil(max_conversion_time / portTICK_PERIOD_MS);
+        ESP_LOGD(TAG, "wait for conversion: max %.0f ms, %d ticks", max_conversion_time, max_conversion_ticks);
+
+        // wait for conversion to complete - all devices will pull bus low once complete
+        TickType_t start_ticks = xTaskGetTickCount();
+        TickType_t duration_ticks = 0;
+        uint8_t status = 0;
+        do
+        {
+            vTaskDelay(1);
+            owb_read_bit(ds18b20_info->bus, &status);
+            duration_ticks = xTaskGetTickCount() - start_ticks;
+        } while (status == 0 && duration_ticks < max_conversion_ticks);
+
+        elapsed_time = duration_ticks * portTICK_PERIOD_MS;
+        if (duration_ticks >= max_conversion_ticks)
+        {
+            ESP_LOGW(TAG, "conversion timed out");
+        }
+        else
+        {
+            ESP_LOGD(TAG, "conversion took at most %.0f ms", elapsed_time);
+        }
+    }
+    return elapsed_time;
+}
+
+static float _decode_temp(uint8_t lsb, uint8_t msb, DS18B20_RESOLUTION resolution)
+{
+    float result = 0.0f;
+    if (_check_resolution(resolution))
+    {
+        // masks to remove undefined bits from result
+        static const uint8_t lsb_mask[4] = { ~0x07, ~0x03, ~0x01, ~0x00 };
+        uint8_t lsb_masked = lsb_mask[resolution - DS18B20_RESOLUTION_9_BIT] & lsb;
+        int16_t raw = (msb << 8) | lsb_masked;
+        result = raw / 16.0f;
+    }
+    else
+    {
+        ESP_LOGE(TAG, "Unsupported resolution %d", resolution);
+    }
+    return result;
+}
+
+static size_t _min(size_t x, size_t y)
+{
+    return x > y ? y : x;
+}
+
+static DS18B20_ERROR _read_scratchpad(const DS18B20_Info * ds18b20_info, Scratchpad * scratchpad, size_t count)
+{
+    // If CRC is enabled, regardless of count, read the entire scratchpad and verify the CRC,
+    // otherwise read up to the scratchpad size, or count, whichever is smaller.
+
+    if (!scratchpad) {
+        return DS18B20_ERROR_NULL;
+    }
+
+    DS18B20_ERROR err = DS18B20_ERROR_UNKNOWN;
+
+    if (ds18b20_info->use_crc)
+    {
+        count = sizeof(Scratchpad);
+    }
+    count = _min(sizeof(Scratchpad), count);   // avoid reading past end of scratchpad
+
+    ESP_LOGD(TAG, "scratchpad read: CRC %d, count %d", ds18b20_info->use_crc, count);
+    if (_address_device(ds18b20_info))
+    {
+        // read scratchpad
+        if (owb_write_byte(ds18b20_info->bus, DS18B20_FUNCTION_SCRATCHPAD_READ) == OWB_STATUS_OK)
+        {
+            if (owb_read_bytes(ds18b20_info->bus, (uint8_t *)scratchpad, count) == OWB_STATUS_OK)
+            {
+                ESP_LOG_BUFFER_HEX_LEVEL(TAG, scratchpad, count, ESP_LOG_DEBUG);
+
+                err = DS18B20_OK;
+                if (!ds18b20_info->use_crc)
+                {
+                    // Without CRC, or partial read:
+                    ESP_LOGD(TAG, "No CRC check");
+                    bool is_present = false;
+                    owb_reset(ds18b20_info->bus, &is_present);  // terminate early
+                }
+                else
+                {
+                    // With CRC:
+                    if (owb_crc8_bytes(0, (uint8_t *)scratchpad, sizeof(*scratchpad)) != 0)
+                    {
+                        ESP_LOGE(TAG, "CRC failed");
+                        err = DS18B20_ERROR_CRC;
+                    }
+                    else
+                    {
+                        ESP_LOGD(TAG, "CRC ok");
+                    }
+                }
+            }
+            else
+            {
+                ESP_LOGE(TAG, "owb_read_bytes failed");
+                err = DS18B20_ERROR_OWB;
+            }
+        }
+        else
+        {
+            ESP_LOGE(TAG, "owb_write_byte failed");
+            err = DS18B20_ERROR_OWB;
+        }
+    }
+    else
+    {
+        err = DS18B20_ERROR_DEVICE;
+    }
+    return err;
+}
+
+static bool _write_scratchpad(const DS18B20_Info * ds18b20_info, const Scratchpad * scratchpad, bool verify)
+{
+    bool result = false;
+    // Only bytes 2, 3 and 4 (trigger and configuration) can be written.
+    // All three bytes MUST be written before the next reset to avoid corruption.
+    if (_is_init(ds18b20_info))
+    {
+        if (_address_device(ds18b20_info))
+        {
+            ESP_LOGD(TAG, "scratchpad write 3 bytes:");
+            ESP_LOG_BUFFER_HEX_LEVEL(TAG, &scratchpad->trigger_high, 3, ESP_LOG_DEBUG);
+            owb_write_byte(ds18b20_info->bus, DS18B20_FUNCTION_SCRATCHPAD_WRITE);
+            owb_write_bytes(ds18b20_info->bus, (uint8_t *)&scratchpad->trigger_high, 3);
+            result = true;
+
+            if (verify)
+            {
+                Scratchpad read = {0};
+                if (_read_scratchpad(ds18b20_info, &read, offsetof(Scratchpad, configuration) + 1) == DS18B20_OK)
+                {
+                    if (memcmp(&scratchpad->trigger_high, &read.trigger_high, 3) != 0)
+                    {
+                        ESP_LOGE(TAG, "scratchpad verify failed: "
+                                 "wrote {0x%02x, 0x%02x, 0x%02x}, "
+                                 "read {0x%02x, 0x%02x, 0x%02x}",
+                                 scratchpad->trigger_high, scratchpad->trigger_low, scratchpad->configuration,
+                                 read.trigger_high, read.trigger_low, read.configuration);
+                        result = false;
+                    }
+                }
+                else
+                {
+                    ESP_LOGE(TAG, "read scratchpad failed");
+                    result = false;
+                }
+            }
+        }
+    }
+    return result;
+}
+
+
+// Public API
+
+DS18B20_Info * ds18b20_malloc(void)
+{
+    DS18B20_Info * ds18b20_info = malloc(sizeof(*ds18b20_info));
+    if (ds18b20_info != NULL)
+    {
+        memset(ds18b20_info, 0, sizeof(*ds18b20_info));
+        ESP_LOGD(TAG, "malloc %p", ds18b20_info);
+    }
+    else
+    {
+        ESP_LOGE(TAG, "malloc failed");
+    }
+
+    return ds18b20_info;
+}
+
+void ds18b20_free(DS18B20_Info ** ds18b20_info)
+{
+    if (ds18b20_info != NULL && (*ds18b20_info != NULL))
+    {
+        ESP_LOGD(TAG, "free %p", *ds18b20_info);
+        free(*ds18b20_info);
+        *ds18b20_info = NULL;
+    }
+}
+
+void ds18b20_init(DS18B20_Info * ds18b20_info, const OneWireBus * bus, OneWireBus_ROMCode rom_code)
+{
+    if (ds18b20_info != NULL)
+    {
+        _init(ds18b20_info, bus);
+        ds18b20_info->rom_code = rom_code;
+
+        // read current resolution from device as it may not be power-on or factory default
+        ds18b20_info->resolution = ds18b20_read_resolution(ds18b20_info);
+    }
+    else
+    {
+        ESP_LOGE(TAG, "ds18b20_info is NULL");
+    }
+}
+
+void ds18b20_init_solo(DS18B20_Info * ds18b20_info, const OneWireBus * bus)
+{
+    if (ds18b20_info != NULL)
+    {
+        _init(ds18b20_info, bus);
+        ds18b20_info->solo = true;
+        // ROM code not required
+
+        // read current resolution from device as it may not be power-on or factory default
+        ds18b20_info->resolution = ds18b20_read_resolution(ds18b20_info);
+    }
+    else
+    {
+        ESP_LOGE(TAG, "ds18b20_info is NULL");
+    }
+}
+
+void ds18b20_use_crc(DS18B20_Info * ds18b20_info, bool use_crc)
+{
+    if (_is_init(ds18b20_info))
+    {
+        ds18b20_info->use_crc = use_crc;
+        ESP_LOGD(TAG, "use_crc %d", ds18b20_info->use_crc);
+    }
+}
+
+bool ds18b20_set_resolution(DS18B20_Info * ds18b20_info, DS18B20_RESOLUTION resolution)
+{
+    bool result = false;
+    if (_is_init(ds18b20_info))
+    {
+        if (_check_resolution(ds18b20_info->resolution))
+        {
+            // read scratchpad up to and including configuration register
+            Scratchpad scratchpad = {0};
+            _read_scratchpad(ds18b20_info, &scratchpad,
+                    offsetof(Scratchpad, configuration) - offsetof(Scratchpad, temperature) + 1);
+
+            // modify configuration register to set resolution
+            uint8_t value = (((resolution - 1) & 0x03) << 5) | 0x1f;
+            scratchpad.configuration = value;
+            ESP_LOGD(TAG, "configuration value 0x%02x", value);
+
+            // write bytes 2, 3 and 4 of scratchpad
+            result = _write_scratchpad(ds18b20_info, &scratchpad, /* verify */ true);
+            if (result)
+            {
+                ds18b20_info->resolution = resolution;
+                ESP_LOGD(TAG, "Resolution set to %d bits", (int)resolution);
+            }
+            else
+            {
+                // Resolution change failed - update the info resolution with the value read from configuration
+                ds18b20_info->resolution = ds18b20_read_resolution(ds18b20_info);
+                ESP_LOGW(TAG, "Resolution consistency lost - refreshed from device: %d", ds18b20_info->resolution);
+            }
+        }
+        else
+        {
+            ESP_LOGE(TAG, "Unsupported resolution %d", resolution);
+        }
+    }
+    return result;
+}
+
+DS18B20_RESOLUTION ds18b20_read_resolution(DS18B20_Info * ds18b20_info)
+{
+    DS18B20_RESOLUTION resolution = DS18B20_RESOLUTION_INVALID;
+    if (_is_init(ds18b20_info))
+    {
+        // read scratchpad up to and including configuration register
+        Scratchpad scratchpad = {0};
+        _read_scratchpad(ds18b20_info, &scratchpad,
+                offsetof(Scratchpad, configuration) - offsetof(Scratchpad, temperature) + 1);
+
+        resolution = ((scratchpad.configuration >> 5) & 0x03) + DS18B20_RESOLUTION_9_BIT;
+        if (!_check_resolution(resolution))
+        {
+            ESP_LOGE(TAG, "invalid resolution read from device: 0x%02x", scratchpad.configuration);
+            resolution = DS18B20_RESOLUTION_INVALID;
+        }
+        else
+        {
+            ESP_LOGD(TAG, "Resolution read as %d", resolution);
+        }
+    }
+    return resolution;
+}
+
+bool ds18b20_convert(const DS18B20_Info * ds18b20_info)
+{
+    bool result = false;
+    if (_is_init(ds18b20_info))
+    {
+        const OneWireBus * bus = ds18b20_info->bus;
+        if (_address_device(ds18b20_info))
+        {
+            // initiate a temperature measurement
+            owb_write_byte(bus, DS18B20_FUNCTION_TEMP_CONVERT);
+            result = true;
+        }
+        else
+        {
+            ESP_LOGE(TAG, "ds18b20 device not responding");
+        }
+    }
+    return result;
+}
+
+void ds18b20_convert_all(const OneWireBus * bus)
+{
+    if (bus)
+    {
+        bool is_present = false;
+        owb_reset(bus, &is_present);
+        owb_write_byte(bus, OWB_ROM_SKIP);
+        owb_write_byte(bus, DS18B20_FUNCTION_TEMP_CONVERT);
+        owb_set_strong_pullup(bus, true);
+    }
+    else
+    {
+        ESP_LOGE(TAG, "bus is NULL");
+    }
+}
+
+float ds18b20_wait_for_conversion(const DS18B20_Info * ds18b20_info)
+{
+    float elapsed_time = 0.0f;
+    if (_is_init(ds18b20_info))
+    {
+        if (ds18b20_info->bus->use_parasitic_power)
+        {
+            // in parasitic mode, devices cannot signal when they are complete,
+            // so use the datasheet values to wait for a duration.
+            elapsed_time = _wait_for_duration(ds18b20_info->resolution);
+        }
+        else
+        {
+            // wait for the device(s) to indicate the conversion is complete
+            elapsed_time = _wait_for_device_signal(ds18b20_info);
+        }
+    }
+    return elapsed_time;
+}
+
+DS18B20_ERROR ds18b20_read_temp(const DS18B20_Info * ds18b20_info, float * value)
+{
+    DS18B20_ERROR err = DS18B20_ERROR_UNKNOWN;
+    if (_is_init(ds18b20_info))
+    {
+        uint8_t temp_LSB = 0x00;
+        uint8_t temp_MSB = 0x80;
+        Scratchpad scratchpad = {0};
+        if ((err = _read_scratchpad(ds18b20_info, &scratchpad, 2)) == DS18B20_OK)
+        {
+            temp_LSB = scratchpad.temperature[0];
+            temp_MSB = scratchpad.temperature[1];
+        }
+
+        // https://github.com/cpetrich/counterfeit_DS18B20#solution-to-the-85-c-problem
+        if (scratchpad.reserved[1] == 0x0c && temp_MSB == 0x05 && temp_LSB == 0x50)
+        {
+            ESP_LOGE(TAG, "Read power-on value (85.0)");
+            err = DS18B20_ERROR_DEVICE;
+        }
+
+        float temp = _decode_temp(temp_LSB, temp_MSB, ds18b20_info->resolution);
+        ESP_LOGD(TAG, "temp_LSB 0x%02x, temp_MSB 0x%02x, temp %f", temp_LSB, temp_MSB, temp);
+
+        if (value)
+        {
+            *value = temp;
+        }
+    }
+    return err;
+}
+
+DS18B20_ERROR ds18b20_convert_and_read_temp(const DS18B20_Info * ds18b20_info, float * value)
+{
+    DS18B20_ERROR err = DS18B20_ERROR_UNKNOWN;
+    if (_is_init(ds18b20_info))
+    {
+        if (ds18b20_convert(ds18b20_info))
+        {
+            // wait at least maximum conversion time
+            ds18b20_wait_for_conversion(ds18b20_info);
+
+            if (value)
+            {
+                *value = 0.0f;
+                err = ds18b20_read_temp(ds18b20_info, value);
+            }
+            else
+            {
+                err = DS18B20_ERROR_NULL;
+            }
+        }
+    }
+    return err;
+}
+
+DS18B20_ERROR ds18b20_check_for_parasite_power(const OneWireBus * bus, bool * present)
+{
+    DS18B20_ERROR err = DS18B20_ERROR_UNKNOWN;
+    ESP_LOGD(TAG, "ds18b20_check_for_parasite_power");
+    if (bus) {
+        bool reset_present;
+        if ((err = owb_reset(bus, &reset_present)) == DS18B20_OK)
+        {
+            ESP_LOGD(TAG, "owb_reset OK");
+            if ((err = owb_write_byte(bus, OWB_ROM_SKIP)) == DS18B20_OK)
+            {
+                ESP_LOGD(TAG, "owb_write_byte(ROM_SKIP) OK");
+                if ((err = owb_write_byte(bus, DS18B20_FUNCTION_POWER_SUPPLY_READ)) == DS18B20_OK)
+                {
+                    // Parasitic-powered devices will pull the bus low during read time slot
+                    ESP_LOGD(TAG, "owb_write_byte(POWER_SUPPLY_READ) OK");
+                    uint8_t value = 0;
+                    if ((err = owb_read_bit(bus, &value)) == DS18B20_OK)
+                    {
+                        ESP_LOGD(TAG, "owb_read_bit OK: 0x%02x", value);
+                        if (present)
+                        {
+                            *present = !(bool)(value & 0x01u);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    else
+    {
+        ESP_LOGE(TAG, "bus is NULL");
+        err = DS18B20_ERROR_NULL;
+    }
+    return err;
+}
--- a/components/esp32-ds18b20/include/ds18b20.h
+++ b/components/esp32-ds18b20/include/ds18b20.h
@ -0,0 +1,206 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 David Antliff
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file ds18b20.h
+ * @brief Interface definitions for the Maxim Integrated DS18B20 Programmable
+ *        Resolution 1-Wire Digital Thermometer device.
+ *
+ * This component provides structures and functions that are useful for communicating
+ * with DS18B20 devices connected via a Maxim Integrated 1-Wire® bus.
+ */
+
+#ifndef DS18B20_H
+#define DS18B20_H
+
+#include "owb.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Success and error codes.
+ */
+typedef enum
+{
+    DS18B20_ERROR_UNKNOWN = -1,  ///< An unknown error occurred, or the value was not set
+    DS18B20_OK = 0,        ///< Success
+    DS18B20_ERROR_DEVICE,  ///< A device error occurred
+    DS18B20_ERROR_CRC,     ///< A CRC error occurred
+    DS18B20_ERROR_OWB,     ///< A One Wire Bus error occurred
+    DS18B20_ERROR_NULL,    ///< A parameter or value is NULL
+} DS18B20_ERROR;
+
+/**
+ * @brief Symbols for the supported temperature resolution of the device.
+ */
+typedef enum
+{
+    DS18B20_RESOLUTION_INVALID = -1,  ///< Invalid resolution
+    DS18B20_RESOLUTION_9_BIT   = 9,   ///< 9-bit resolution, LSB bits 2,1,0 undefined
+    DS18B20_RESOLUTION_10_BIT  = 10,  ///< 10-bit resolution, LSB bits 1,0 undefined
+    DS18B20_RESOLUTION_11_BIT  = 11,  ///< 11-bit resolution, LSB bit 0 undefined
+    DS18B20_RESOLUTION_12_BIT  = 12,  ///< 12-bit resolution (default)
+} DS18B20_RESOLUTION;
+
+/**
+ * @brief Structure containing information related to a single DS18B20 device connected
+ * via a 1-Wire bus.
+ */
+typedef struct
+{
+    bool init;                     ///< True if struct has been initialised, otherwise false
+    bool solo;                     ///< True if device is intended to be the only one connected to the bus, otherwise false
+    bool use_crc;                  ///< True if CRC checks are to be used when retrieving information from a device on the bus
+    const OneWireBus * bus;        ///< Pointer to 1-Wire bus information relevant to this device
+    OneWireBus_ROMCode rom_code;   ///< The ROM code used to address this device on the bus
+    DS18B20_RESOLUTION resolution; ///< Temperature measurement resolution per reading
+} DS18B20_Info;
+
+/**
+ * @brief Construct a new device info instance.
+ *        New instance should be initialised before calling other functions.
+ * @return Pointer to new device info instance, or NULL if it cannot be created.
+ */
+DS18B20_Info * ds18b20_malloc(void);
+
+/**
+ * @brief Delete an existing device info instance.
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @param[in,out] ds18b20_info Pointer to device info instance that will be freed and set to NULL.
+ */
+void ds18b20_free(DS18B20_Info ** ds18b20_info);
+
+/**
+ * @brief Initialise a device info instance with the specified GPIO.
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @param[in] bus Pointer to initialised 1-Wire bus instance.
+ * @param[in] rom_code Device-specific ROM code to identify a device on the bus.
+ */
+void ds18b20_init(DS18B20_Info * ds18b20_info, const OneWireBus * bus, OneWireBus_ROMCode rom_code);
+
+/**
+ * @brief Initialise a device info instance as a solo device on the bus.
+ *
+ * This is subject to the requirement that this device is the ONLY device on the bus.
+ * This allows for faster commands to be used without ROM code addressing.
+ *
+ * NOTE: if additional devices are added to the bus, operation will cease to work correctly.
+ *
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @param[in] bus Pointer to initialised 1-Wire bus instance.
+ */
+void ds18b20_init_solo(DS18B20_Info * ds18b20_info, const OneWireBus * bus);
+
+/**
+ * @brief Enable or disable use of CRC checks on device communications.
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @param[in] use_crc True to enable CRC checks, false to disable.
+ */
+void ds18b20_use_crc(DS18B20_Info * ds18b20_info, bool use_crc);
+
+/**
+ * @brief Set temperature measurement resolution.
+ *
+ * This programs the hardware to the specified resolution and sets the cached value to be the same.
+ * If the program fails, the value currently in hardware is used to refresh the cache.
+ *
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @param[in] resolution Selected resolution.
+ * @return True if successful, otherwise false.
+ */
+bool ds18b20_set_resolution(DS18B20_Info * ds18b20_info, DS18B20_RESOLUTION resolution);
+
+/**
+ * @brief Update and return the current temperature measurement resolution from the device.
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @return The currently configured temperature measurement resolution.
+ */
+DS18B20_RESOLUTION ds18b20_read_resolution(DS18B20_Info * ds18b20_info);
+
+/**
+ * @brief Read 64-bit ROM code from device - only works when there is a single device on the bus.
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @return The 64-bit value read from the device's ROM.
+ */
+OneWireBus_ROMCode ds18b20_read_rom(DS18B20_Info * ds18b20_info);
+
+/**
+ * @brief Start a temperature measurement conversion on a single device.
+ * @param[in] ds18b20_info Pointer to device info instance.
+ */
+bool ds18b20_convert(const DS18B20_Info * ds18b20_info);
+
+/**
+ * @brief Start temperature conversion on all connected devices.
+ *
+ * This should be followed by a sufficient delay to ensure all devices complete
+ * their conversion before the measurements are read.
+ * @param[in] bus Pointer to initialised bus instance.
+ */
+void ds18b20_convert_all(const OneWireBus * bus);
+
+/**
+ * @brief Wait for the maximum conversion time according to the current resolution of the device.
+ *        In external power mode, the device or devices can signal when conversion has completed.
+ *        In parasitic power mode, this is not possible, so a pre-calculated delay is performed.
+ * @param[in] ds18b20_info Pointer to device info instance.
+ * @return An estimate of the time elapsed, in milliseconds. Actual elapsed time may be greater.
+ */
+float ds18b20_wait_for_conversion(const DS18B20_Info * ds18b20_info);
+
+/**
+ * @brief Read last temperature measurement from device.
+ *
+ * This is typically called after ds18b20_start_mass_conversion(), provided enough time
+ * has elapsed to ensure that all devices have completed their conversions.
+ * @param[in] ds18b20_info Pointer to device info instance. Must be initialised first.
+ * @param[out] value Pointer to the measurement value returned by the device, in degrees Celsius.
+ * @return DS18B20_OK if read is successful, otherwise error.
+ */
+DS18B20_ERROR ds18b20_read_temp(const DS18B20_Info * ds18b20_info, float * value);
+
+/**
+ * @brief Convert, wait and read current temperature from device.
+ * @param[in] ds18b20_info Pointer to device info instance. Must be initialised first.
+ * @param[out] value Pointer to the measurement value returned by the device, in degrees Celsius.
+ * @return DS18B20_OK if read is successful, otherwise error.
+ */
+DS18B20_ERROR ds18b20_convert_and_read_temp(const DS18B20_Info * ds18b20_info, float * value);
+
+/**
+ * @brief Check OneWire bus for presence of parasitic-powered devices.
+ *
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[out] present Result value, true if a parasitic-powered device was detected.
+ * @return DS18B20_OK if check is successful, otherwise error.
+ */
+DS18B20_ERROR ds18b20_check_for_parasite_power(const OneWireBus * bus, bool * present);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // DS18B20_H
--- a/components/esp32-ds18b20/library.json
+++ b/components/esp32-ds18b20/library.json
@ -0,0 +1,26 @@
+{
+  "name": "esp32-ds18b20",
+  "keywords": "onewire, 1-wire, bus, sensor, temperature",
+  "description": "ESP32-compatible C component for the Maxim Integrated DS18B20 Programmable Resolution 1-Wire Digital Thermometer.",
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/DavidAntliff/esp32-ds18b20.git"
+  },
+  "authors":
+  [
+    {
+      "name": "David Antliff",
+      "url": "https://github.com/DavidAntliff",
+      "maintainer": true
+    }
+  ],
+  "version": "0.1",
+  "frameworks": "espidf",
+  "platforms": "espressif32",
+  "build": {
+    "flags": [
+        "-I include/"
+    ]
+  }
+}
--- a/components/esp32-owb/.travis.yml
+++ b/components/esp32-owb/.travis.yml
@ -0,0 +1,39 @@
+# Build and deploy doxygen documention to GitHub Pages
+sudo: false
+dist: trusty
+
+# Blacklist
+branches:
+  only:
+    - master
+
+# Environment variables
+env:
+  global:
+    - GH_REPO_REF: github.com/DavidAntliff/esp32-owb.git
+
+# Install dependencies
+addons:
+  apt:
+    packages:
+      - doxygen
+      - doxygen-doc
+      - doxygen-latex
+      - doxygen-gui
+      - graphviz
+
+# Build the docs
+script:
+  - cd doc
+  - doxygen
+
+# Deploy using Travis-CI/GitHub Pages integration support
+deploy:
+  provider: pages
+  skip-cleanup: true
+  local-dir: doc/html
+  github-token: $GITHUB_TOKEN
+  on:
+    branch: master
+  target-branch: gh-pages
+
--- a/components/esp32-owb/CMakeLists.txt
+++ b/components/esp32-owb/CMakeLists.txt
@ -0,0 +1,5 @@
+set(COMPONENT_ADD_INCLUDEDIRS include)
+set(COMPONENT_SRCS "owb.c" "owb_gpio.c" "owb_rmt.c")
+register_component()
+
+
--- a/components/esp32-owb/LICENSE
+++ b/components/esp32-owb/LICENSE
@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 David Antliff
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/components/esp32-owb/README.md
+++ b/components/esp32-owb/README.md
@ -0,0 +1,60 @@
+# esp32-owb
+
+This is a ESP32-compatible C component for the Maxim Integrated "1-Wire" protocol.
+
+It is written and tested for version 3.0-3.3 and 4.1-beta1 of the [ESP-IDF](https://github.com/espressif/esp-idf) 
+environment, using the xtensa-esp32-elf toolchain (gcc version 5.2.0, crosstool-ng-1.22.0-80-g6c4433a).
+
+Support for v2.1 is available on the [ESP-IDF_v2.1](https://github.com/DavidAntliff/esp32-owb/tree/ESP-IDF_v2.1) branch.
+
+## Features
+
+This library includes:
+
+ * External power supply mode.
+ * Parasitic power mode.
+ * Static (stack-based) or dynamic (malloc-based) memory model.
+ * No globals - support any number of 1-Wire buses simultaneously.
+ * 1-Wire device detection and validation, including search for multiple devices on a single bus.
+ * Addressing optimisation for a single (solo) device on a bus.
+ * 1-Wire bus operations including multi-byte read and write operations.
+ * CRC checks on ROM code.
+
+This component includes two methods of bus access - delay-driven GPIO and RMT-driven slots.
+The original implementation used CPU delays to construct the 1-Wire read/write timeslots
+however this proved to be too unreliable. A second method, using the ESP32's RMT peripheral,
+results in very accurate read/write timeslots and more reliable operation.
+
+Therefore I highly recommend that you use the RMT driver. *The GPIO driver is deprecated and will be removed.*
+
+See documentation for [esp32-ds18b20](https://www.github.com/DavidAntliff/esp32-ds18b20-example#parasitic-power-mode) 
+for further information about parasitic power mode, including strong pull-up configuration.
+
+## Documentation
+
+Automatically generated API documentation (doxygen) is available [here](https://davidantliff.github.io/esp32-owb/index.html).
+
+## Source Code
+
+The source is available from [GitHub](https://www.github.com/DavidAntliff/esp32-owb).
+
+## License
+
+The code in this project is licensed under the MIT license - see LICENSE for details.
+
+## Links
+
+ * [esp32-ds18b20](https://github.com/DavidAntliff/esp32-ds18b20) - ESP32-compatible DS18B20 Digital Thermometer 
+                                                                    component for ESP32
+ * [1-Wire Communication Through Software](https://www.maximintegrated.com/en/app-notes/index.mvp/id/126)
+ * [1-Wire Search Algorithm](https://www.maximintegrated.com/en/app-notes/index.mvp/id/187)
+ * [Espressif IoT Development Framework for ESP32](https://github.com/espressif/esp-idf)
+
+## Acknowledgements
+
+Thank you to [Chris Morgan](https://github.com/chmorgan) for his contribution of adding RMT peripheral support for more
+reliable operation.
+
+Parts of this code are based on references provided to the public domain by Maxim Integrated.
+
+"1-Wire" is a registered trademark of Maxim Integrated.
--- a/components/esp32-owb/component.mk
+++ b/components/esp32-owb/component.mk
@ -0,0 +1 @@
+# Use defaults.
--- a/components/esp32-owb/doc/.gitignore
+++ b/components/esp32-owb/doc/.gitignore
@ -0,0 +1,3 @@
+html/
+latex/
+
--- a/components/esp32-owb/doc/Doxyfile
+++ b/components/esp32-owb/doc/Doxyfile
--- a/components/esp32-owb/include/owb.h
+++ b/components/esp32-owb/include/owb.h
@ -0,0 +1,336 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 David Antliff
+ * Copyright (c) 2017 Chris Morgan <chmorgan@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file
+ * @brief Interface definitions for the 1-Wire bus component.
+ *
+ * This component provides structures and functions that are useful for communicating
+ * with devices connected to a Maxim Integrated 1-Wire® bus via a single GPIO.
+ *
+ * Externally powered and "parasite-powered" devices are supported.
+ * Please consult your device's datasheet for power requirements.
+ */
+
+#ifndef ONE_WIRE_BUS_H
+#define ONE_WIRE_BUS_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "driver/gpio.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+// ROM commands
+#define OWB_ROM_SEARCH        0xF0  ///< Perform Search ROM cycle to identify devices on the bus
+#define OWB_ROM_READ          0x33  ///< Read device ROM (single device on bus only)
+#define OWB_ROM_MATCH         0x55  ///< Address a specific device on the bus by ROM
+#define OWB_ROM_SKIP          0xCC  ///< Address all devices on the bus simultaneously
+#define OWB_ROM_SEARCH_ALARM  0xEC  ///< Address all devices on the bus with a set alarm flag
+
+#define OWB_ROM_CODE_STRING_LENGTH (17)  ///< Typical length of OneWire bus ROM ID as ASCII hex string, including null terminator
+
+#ifndef GPIO_NUM_NC
+#  define GPIO_NUM_NC (-1)  ///< ESP-IDF prior to v4.x does not define GPIO_NUM_NC
+#endif
+
+struct owb_driver;
+
+/**
+ * @brief Structure containing 1-Wire bus information relevant to a single instance.
+ */
+typedef struct
+{
+    const struct _OneWireBus_Timing * timing;   ///< Pointer to timing information
+    bool use_crc;                               ///< True if CRC checks are to be used when retrieving information from a device on the bus
+    bool use_parasitic_power;                   ///< True if parasitic-powered devices are expected on the bus
+    gpio_num_t strong_pullup_gpio;              ///< Set if an external strong pull-up circuit is required
+    const struct owb_driver * driver;           ///< Pointer to hardware driver instance
+} OneWireBus;
+
+/**
+ * @brief Represents a 1-Wire ROM Code. This is a sequence of eight bytes, where
+ *        the first byte is the family number, then the following 6 bytes form the
+ *        serial number. The final byte is the CRC8 check byte.
+ */
+typedef union
+{
+    /// Provides access via field names
+    struct fields
+    {
+        uint8_t family[1];         ///< family identifier (1 byte, LSB - read/write first)
+        uint8_t serial_number[6];  ///< serial number (6 bytes)
+        uint8_t crc[1];            ///< CRC check byte (1 byte, MSB - read/write last)
+    } fields;                      ///< Provides access via field names
+
+    uint8_t bytes[8];              ///< Provides raw byte access
+
+} OneWireBus_ROMCode;
+
+/**
+ * @brief Represents the state of a device search on the 1-Wire bus.
+ *
+ *        Pass a pointer to this structure to owb_search_first() and
+ *        owb_search_next() to iterate through detected devices on the bus.
+ */
+typedef struct
+{
+    OneWireBus_ROMCode rom_code;   ///< Device ROM code
+    int last_discrepancy;          ///< Bit index that identifies from which bit the next search discrepancy check should start
+    int last_family_discrepancy;   ///< Bit index that identifies the last discrepancy within the first 8-bit family code of the ROM code
+    int last_device_flag;          ///< Flag to indicate previous search was the last device detected
+} OneWireBus_SearchState;
+
+/**
+ * @brief Represents the result of OWB API functions.
+ */
+typedef enum
+{
+    OWB_STATUS_NOT_SET = -1,           ///< A status value has not been set
+    OWB_STATUS_OK = 0,                 ///< Operation succeeded
+    OWB_STATUS_NOT_INITIALIZED,        ///< Function was passed an uninitialised variable
+    OWB_STATUS_PARAMETER_NULL,         ///< Function was passed a null pointer
+    OWB_STATUS_DEVICE_NOT_RESPONDING,  ///< No response received from the addressed device or devices
+    OWB_STATUS_CRC_FAILED,             ///< CRC failed on data received from a device or devices
+    OWB_STATUS_TOO_MANY_BITS,          ///< Attempt to write an incorrect number of bits to the One Wire Bus
+    OWB_STATUS_HW_ERROR                ///< A hardware error occurred
+} owb_status;
+
+/** NOTE: Driver assumes that (*init) was called prior to any other methods */
+struct owb_driver
+{
+    /** Driver identification **/
+    const char* name;
+
+    /** Pointer to driver uninitialization function **/
+    owb_status (*uninitialize)(const OneWireBus * bus);
+
+    /** Pointer to driver reset functio **/
+    owb_status (*reset)(const OneWireBus * bus, bool *is_present);
+
+    /** NOTE: The data is shifted out of the low bits, eg. it is written in the order of lsb to msb */
+    owb_status (*write_bits)(const OneWireBus *bus, uint8_t out, int number_of_bits_to_write);
+
+    /** NOTE: Data is read into the high bits, eg. each bit read is shifted down before the next bit is read */
+    owb_status (*read_bits)(const OneWireBus *bus, uint8_t *in, int number_of_bits_to_read);
+};
+
+/// @cond ignore
+#define container_of(ptr, type, member) ({                      \
+        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+        (type *)( (char *)__mptr - offsetof(type,member) );})
+/// @endcond
+
+/**
+ * @brief call to release resources after completing use of the OneWireBus
+ * @param[in] bus Pointer to initialised bus instance.
+ * @return status
+ */
+owb_status owb_uninitialize(OneWireBus * bus);
+
+/**
+ * @brief Enable or disable use of CRC checks on device communications.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] use_crc True to enable CRC checks, false to disable.
+ * @return status
+ */
+owb_status owb_use_crc(OneWireBus * bus, bool use_crc);
+
+/**
+ * @brief Enable or disable use of parasitic power on the One Wire Bus.
+ *        This affects how devices signal on the bus, as devices cannot
+ *        signal by pulling the bus low when it is pulled high.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] use_parasitic_power True to enable parasitic power, false to disable.
+ * @return status
+ */
+owb_status owb_use_parasitic_power(OneWireBus * bus, bool use_parasitic_power);
+
+/**
+ * @brief Enable or disable use of extra GPIO to activate strong pull-up circuit.
+ *        This only has effect if parasitic power mode is enabled.
+ *        signal by pulling the bus low when it is pulled high.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] gpio Set to GPIO number to use, or GPIO_NUM_NC to disable.
+ * @return status
+ */
+owb_status owb_use_strong_pullup_gpio(OneWireBus * bus, gpio_num_t gpio);
+
+/**
+ * @brief Read ROM code from device - only works when there is a single device on the bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[out] rom_code the value read from the device's rom
+ * @return status
+ */
+owb_status owb_read_rom(const OneWireBus * bus, OneWireBus_ROMCode * rom_code);
+
+/**
+ * @brief Verify the device specified by ROM code is present.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] rom_code ROM code to verify.
+ * @param[out] is_present Set to true if a device is present, false if not
+ * @return status
+ */
+owb_status owb_verify_rom(const OneWireBus * bus, OneWireBus_ROMCode rom_code, bool * is_present);
+
+/**
+ * @brief Reset the 1-Wire bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[out] is_present set to true if at least one device is present on the bus
+ * @return status
+ */
+owb_status owb_reset(const OneWireBus * bus, bool * is_present);
+
+/**
+ * @brief Read a single bit from the 1-Wire bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[out] out The bit value read from the bus.
+ * @return status
+ */
+owb_status owb_read_bit(const OneWireBus * bus, uint8_t * out);
+
+/**
+ * @brief Read a single byte from the 1-Wire bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[out] out The byte value read from the bus (lsb only).
+ * @return status
+ */
+owb_status owb_read_byte(const OneWireBus * bus, uint8_t * out);
+
+/**
+ * @brief Read a number of bytes from the 1-Wire bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in, out] buffer Pointer to buffer to receive read data.
+ * @param[in] len Number of bytes to read, must not exceed length of receive buffer.
+ * @return status.
+ */
+owb_status owb_read_bytes(const OneWireBus * bus, uint8_t * buffer, unsigned int len);
+
+/**
+ * @brief Write a bit to the 1-Wire bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] bit Value to write (lsb only).
+ * @return status
+ */
+owb_status owb_write_bit(const OneWireBus * bus, uint8_t bit);
+
+/**
+ * @brief Write a single byte to the 1-Wire bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] data Byte value to write to bus.
+ * @return status
+ */
+owb_status owb_write_byte(const OneWireBus * bus, uint8_t data);
+
+/**
+ * @brief Write a number of bytes to the 1-Wire bus.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] buffer Pointer to buffer to write data from.
+ * @param[in] len Number of bytes to write.
+ * @return status
+ */
+owb_status owb_write_bytes(const OneWireBus * bus, const uint8_t * buffer, size_t len);
+
+/**
+ * @brief Write a ROM code to the 1-Wire bus ensuring LSB is sent first.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] rom_code ROM code to write to bus.
+ * @return status
+ */
+owb_status owb_write_rom_code(const OneWireBus * bus, OneWireBus_ROMCode rom_code);
+
+/**
+ * @brief 1-Wire 8-bit CRC lookup.
+ * @param[in] crc Starting CRC value. Pass in prior CRC to accumulate.
+ * @param[in] data Byte to feed into CRC.
+ * @return Resultant CRC value.
+ *         Should be zero if last byte was the CRC byte and the CRC matches.
+ */
+uint8_t owb_crc8_byte(uint8_t crc, uint8_t data);
+
+/**
+ * @brief 1-Wire 8-bit CRC lookup with accumulation over a block of bytes.
+ * @param[in] crc Starting CRC value. Pass in prior CRC to accumulate.
+ * @param[in] data Array of bytes to feed into CRC.
+ * @param[in] len Length of data array in bytes.
+ * @return Resultant CRC value.
+ *         Should be zero if last byte was the CRC byte and the CRC matches.
+ */
+uint8_t owb_crc8_bytes(uint8_t crc, const uint8_t * data, size_t len);
+
+/**
+ * @brief Locates the first device on the 1-Wire bus, if present.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in,out] state Pointer to an existing search state structure.
+ * @param[out] found_device True if a device is found, false if no devices are found.
+ *         If a device is found, the ROM Code can be obtained from the state.
+ * @return status
+ */
+owb_status owb_search_first(const OneWireBus * bus, OneWireBus_SearchState * state, bool *found_device);
+
+/**
+ * @brief Locates the next device on the 1-Wire bus, if present, starting from
+ *        the provided state. Further calls will yield additional devices, if present.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in,out] state Pointer to an existing search state structure.
+ * @param[out] found_device True if a device is found, false if no devices are found.
+ *         If a device is found, the ROM Code can be obtained from the state.
+ * @return status
+ */
+owb_status owb_search_next(const OneWireBus * bus, OneWireBus_SearchState * state, bool *found_device);
+
+/**
+ * @brief Create a string representation of a ROM code, most significant byte (CRC8) first.
+ * @param[in] rom_code The ROM code to convert to string representation.
+ * @param[out] buffer The destination for the string representation. It will be null terminated.
+ * @param[in] len The length of the buffer in bytes. 64-bit ROM codes require 16 characters
+ *                to represent as a string, plus a null terminator, for 17 bytes.
+ *                See OWB_ROM_CODE_STRING_LENGTH.
+ * @return pointer to the byte beyond the last byte written
+ */
+char * owb_string_from_rom_code(OneWireBus_ROMCode rom_code, char * buffer, size_t len);
+
+/**
+ * @brief Enable or disable the strong-pullup GPIO, if configured.
+ * @param[in] bus Pointer to initialised bus instance.
+ * @param[in] enable If true, enable the external strong pull-up by setting the GPIO high.
+ *                   If false, disable the external strong pull-up by setting the GPIO low.
+ * @return status
+ */
+owb_status owb_set_strong_pullup(const OneWireBus * bus, bool enable);
+
+
+#include "owb_gpio.h"
+#include "owb_rmt.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // ONE_WIRE_BUS_H
--- a/components/esp32-owb/include/owb_gpio.h
+++ b/components/esp32-owb/include/owb_gpio.h
@ -0,0 +1,70 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 David Antliff
+ * Copyright (c) 2017 Chris Morgan <chmorgan@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file
+ * @brief Interface definitions for the ESP32 GPIO driver used to communicate with devices
+ *        on the One Wire Bus.
+ *
+ * @deprecated
+ * This driver is deprecated and may be removed at some stage. It is not recommended for use
+ * due to issues with imprecise timing.
+ */
+
+#pragma once
+#ifndef OWB_GPIO_H
+#define OWB_GPIO_H
+
+#include "owb.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief GPIO driver information
+ */
+typedef struct
+{
+    int gpio;         ///< Value of the GPIO connected to the 1-Wire bus
+    OneWireBus bus;   ///< OneWireBus instance
+} owb_gpio_driver_info;
+
+/**
+ * @brief Initialise the GPIO driver.
+ * @return OneWireBus*, pass this into the other OneWireBus public API functions
+ */
+OneWireBus * owb_gpio_initialize(owb_gpio_driver_info *driver_info, int gpio);
+
+/**
+ * @brief Clean up after a call to owb_gpio_initialize()
+ */
+void owb_gpio_uninitialize(owb_gpio_driver_info *driver_info);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // OWB_GPIO_H
--- a/components/esp32-owb/include/owb_rmt.h
+++ b/components/esp32-owb/include/owb_rmt.h
@ -0,0 +1,75 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 David Antliff
+ * Copyright (c) 2017 Chris Morgan <chmorgan@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file
+ * @brief Interface definitions for ESP32 RMT driver used to communicate with devices
+ *        on the One Wire Bus.
+ *
+ * This is the recommended driver.
+ */
+
+#pragma once
+#ifndef OWB_RMT_H
+#define OWB_RMT_H
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/queue.h"
+#include "freertos/ringbuf.h"
+#include "driver/rmt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief RMT driver information
+ */
+typedef struct
+{
+  int tx_channel;     ///< RMT channel to use for TX
+  int rx_channel;     ///< RMT channel to use for RX
+  RingbufHandle_t rb; ///< Ring buffer handle
+  int gpio;           ///< OneWireBus GPIO
+  OneWireBus bus;     ///< OneWireBus instance
+} owb_rmt_driver_info;
+
+/**
+ * @brief Initialise the RMT driver.
+ * @param[in] info Pointer to an uninitialized owb_rmt_driver_info structure.
+ *                 Note: the structure must remain in scope for the lifetime of this component.
+ * @param[in] gpio_num The GPIO number to use as the One Wire bus data line.
+ * @param[in] tx_channel The RMT channel to use for transmitting data to bus devices.
+ * @param[in] rx_channel the RMT channel to use for receiving data from bus devices.
+ * @return OneWireBus *, pass this into the other OneWireBus public API functions
+ */
+OneWireBus* owb_rmt_initialize(owb_rmt_driver_info * info, gpio_num_t gpio_num,
+                               rmt_channel_t tx_channel, rmt_channel_t rx_channel);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // OWB_RMT_H
--- a/components/esp32-owb/library.json
+++ b/components/esp32-owb/library.json
@ -0,0 +1,30 @@
+{
+  "name": "esp32-owb",
+  "keywords": "onewire, 1-wire, bus, sensor, temperature",
+  "description": "ESP32-compatible C component for the Maxim Integrated 1-Wire protocol.",
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/DavidAntliff/esp32-owb.git"
+  },
+  "authors":
+  [
+    {
+      "name": "David Antliff",
+      "url": "https://github.com/DavidAntliff",
+      "maintainer": true
+    },
+    {
+      "name": "Chris Morgan",
+      "url": "https://github.com/chmorgan"
+    }
+  ],
+  "version": "0.1",
+  "frameworks": "espidf",
+  "platforms": "espressif32",
+  "build": {
+    "flags": [
+        "-I include/"
+    ]
+  }
+}
--- a/components/esp32-owb/owb.c
+++ b/components/esp32-owb/owb.c
@ -0,0 +1,744 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 David Antliff
+ * Copyright (c) 2017 Chris Morgan <chmorgan@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file
+ */
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "sdkconfig.h"
+#include "driver/gpio.h"
+
+#include "owb.h"
+#include "owb_gpio.h"
+
+static const char * TAG = "owb";
+
+static bool _is_init(const OneWireBus * bus)
+{
+    bool ok = false;
+    if (bus != NULL)
+    {
+        if (bus->driver)
+        {
+            // OK
+            ok = true;
+        }
+        else
+        {
+            ESP_LOGE(TAG, "bus is not initialised");
+        }
+    }
+    else
+    {
+        ESP_LOGE(TAG, "bus is NULL");
+    }
+    return ok;
+}
+
+/**
+ * @brief 1-Wire 8-bit CRC lookup.
+ * @param[in] crc Starting CRC value. Pass in prior CRC to accumulate.
+ * @param[in] data Byte to feed into CRC.
+ * @return Resultant CRC value.
+ */
+static uint8_t _calc_crc(uint8_t crc, uint8_t data)
+{
+    // https://www.maximintegrated.com/en/app-notes/index.mvp/id/27
+    static const uint8_t table[256] = {
+            0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
+            157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
+            35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
+            190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
+            70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
+            219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
+            101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
+            248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
+            140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
+            17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
+            175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
+            50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
+            202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
+            87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
+            233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
+            116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
+    };
+
+    return table[crc ^ data];
+}
+
+static uint8_t _calc_crc_block(uint8_t crc, const uint8_t * buffer, size_t len)
+{
+    do
+    {
+        crc = _calc_crc(crc, *buffer++);
+        ESP_LOGD(TAG, "buffer 0x%02x, crc 0x%02x, len %d", (uint8_t)*(buffer - 1), (int)crc, (int)len);
+    }
+    while (--len > 0);
+    return crc;
+}
+
+/**
+ * @param[out] is_found true if a device was found, false if not
+ * @return status
+ */
+static owb_status _search(const OneWireBus * bus, OneWireBus_SearchState * state, bool * is_found)
+{
+    // Based on https://www.maximintegrated.com/en/app-notes/index.mvp/id/187
+
+    // initialize for search
+    int id_bit_number = 1;
+    int last_zero = 0;
+    int rom_byte_number = 0;
+    uint8_t id_bit = 0;
+    uint8_t cmp_id_bit = 0;
+    uint8_t rom_byte_mask = 1;
+    uint8_t search_direction = 0;
+    bool search_result = false;
+    uint8_t crc8 = 0;
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    // if the last call was not the last one
+    if (!state->last_device_flag)
+    {
+        // 1-Wire reset
+        bool is_present;
+        bus->driver->reset(bus, &is_present);
+        if (!is_present)
+        {
+            // reset the search
+            state->last_discrepancy = 0;
+            state->last_device_flag = false;
+            state->last_family_discrepancy = 0;
+            *is_found = false;
+            return OWB_STATUS_OK;
+        }
+
+        // issue the search command
+        bus->driver->write_bits(bus, OWB_ROM_SEARCH, 8);
+
+        // loop to do the search
+        do
+        {
+            id_bit = cmp_id_bit = 0;
+
+            // read a bit and its complement
+            bus->driver->read_bits(bus, &id_bit, 1);
+            bus->driver->read_bits(bus, &cmp_id_bit, 1);
+
+            // check for no devices on 1-wire (signal level is high in both bit reads)
+            if (id_bit && cmp_id_bit)
+            {
+                break;
+            }
+            else
+            {
+                // all devices coupled have 0 or 1
+                if (id_bit != cmp_id_bit)
+                {
+                    search_direction = (id_bit) ? 1 : 0;  // bit write value for search
+                }
+                else
+                {
+                    // if this discrepancy if before the Last Discrepancy
+                    // on a previous next then pick the same as last time
+                    if (id_bit_number < state->last_discrepancy)
+                    {
+                        search_direction = ((state->rom_code.bytes[rom_byte_number] & rom_byte_mask) > 0);
+                    }
+                    else
+                    {
+                        // if equal to last pick 1, if not then pick 0
+                        search_direction = (id_bit_number == state->last_discrepancy);
+                    }
+
+                    // if 0 was picked then record its position in LastZero
+                    if (search_direction == 0)
+                    {
+                        last_zero = id_bit_number;
+
+                        // check for Last discrepancy in family
+                        if (last_zero < 9)
+                        {
+                            state->last_family_discrepancy = last_zero;
+                        }
+                    }
+                }
+
+                // set or clear the bit in the ROM byte rom_byte_number
+                // with mask rom_byte_mask
+                if (search_direction == 1)
+                {
+                    state->rom_code.bytes[rom_byte_number] |= rom_byte_mask;
+                }
+                else
+                {
+                    state->rom_code.bytes[rom_byte_number] &= ~rom_byte_mask;
+                }
+
+                // serial number search direction write bit
+                bus->driver->write_bits(bus, search_direction, 1);
+
+                // increment the byte counter id_bit_number
+                // and shift the mask rom_byte_mask
+                id_bit_number++;
+                rom_byte_mask <<= 1;
+
+                // if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask
+                if (rom_byte_mask == 0)
+                {
+                    crc8 = owb_crc8_byte(crc8, state->rom_code.bytes[rom_byte_number]);  // accumulate the CRC
+                    rom_byte_number++;
+                    rom_byte_mask = 1;
+                }
+            }
+        }
+        while (rom_byte_number < 8);  // loop until through all ROM bytes 0-7
+
+        // if the search was successful then
+        if (!((id_bit_number < 65) || (crc8 != 0)))
+        {
+            // search successful so set LastDiscrepancy,LastDeviceFlag,search_result
+            state->last_discrepancy = last_zero;
+
+            // check for last device
+            if (state->last_discrepancy == 0)
+            {
+                state->last_device_flag = true;
+            }
+
+            search_result = true;
+        }
+    }
+
+    // if no device found then reset counters so next 'search' will be like a first
+    if (!search_result || !state->rom_code.bytes[0])
+    {
+        state->last_discrepancy = 0;
+        state->last_device_flag = false;
+        state->last_family_discrepancy = 0;
+        search_result = false;
+    }
+
+    status = OWB_STATUS_OK;
+
+    *is_found = search_result;
+
+    return status;
+}
+
+// Public API
+
+owb_status owb_uninitialize(OneWireBus * bus)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        bus->driver->uninitialize(bus);
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_use_crc(OneWireBus * bus, bool use_crc)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        bus->use_crc = use_crc;
+        ESP_LOGD(TAG, "use_crc %d", bus->use_crc);
+
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_use_parasitic_power(OneWireBus * bus, bool use_parasitic_power)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        bus->use_parasitic_power = use_parasitic_power;
+        ESP_LOGD(TAG, "use_parasitic_power %d", bus->use_parasitic_power);
+
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_use_strong_pullup_gpio(OneWireBus * bus, gpio_num_t gpio)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        if (gpio != GPIO_NUM_NC) {
+            // The strong GPIO pull-up is only activated if parasitic-power mode is enabled
+            if (!bus->use_parasitic_power) {
+                ESP_LOGW(TAG, "Strong pull-up GPIO set with parasitic-power disabled");
+            }
+
+            gpio_pad_select_gpio(gpio);
+            gpio_set_direction(gpio, GPIO_MODE_OUTPUT);
+        }
+        else
+        {
+            gpio_reset_pin(bus->strong_pullup_gpio);
+        }
+
+        bus->strong_pullup_gpio = gpio;
+        ESP_LOGD(TAG, "use_strong_pullup_gpio %d", bus->strong_pullup_gpio);
+
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_read_rom(const OneWireBus * bus, OneWireBus_ROMCode *rom_code)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    memset(rom_code, 0, sizeof(OneWireBus_ROMCode));
+
+    if (!bus || !rom_code)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        bool is_present;
+        bus->driver->reset(bus, &is_present);
+        if (is_present)
+        {
+            uint8_t value = OWB_ROM_READ;
+            bus->driver->write_bits(bus, value, 8);
+            owb_read_bytes(bus, rom_code->bytes, sizeof(OneWireBus_ROMCode));
+
+            if (bus->use_crc)
+            {
+                if (owb_crc8_bytes(0, rom_code->bytes, sizeof(OneWireBus_ROMCode)) != 0)
+                {
+                    ESP_LOGE(TAG, "CRC failed");
+                    memset(rom_code->bytes, 0, sizeof(OneWireBus_ROMCode));
+                    status = OWB_STATUS_CRC_FAILED;
+                }
+                else
+                {
+                    status = OWB_STATUS_OK;
+                }
+            }
+            else
+            {
+                status = OWB_STATUS_OK;
+            }
+            char rom_code_s[OWB_ROM_CODE_STRING_LENGTH];
+            owb_string_from_rom_code(*rom_code, rom_code_s, sizeof(rom_code_s));
+            ESP_LOGD(TAG, "rom_code %s", rom_code_s);
+        }
+        else
+        {
+            status = OWB_STATUS_DEVICE_NOT_RESPONDING;
+            ESP_LOGE(TAG, "ds18b20 device not responding");
+        }
+    }
+
+    return status;
+}
+
+owb_status owb_verify_rom(const OneWireBus * bus, OneWireBus_ROMCode rom_code, bool * is_present)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+    bool result = false;
+
+    if (!bus || !is_present)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        OneWireBus_SearchState state = {
+            .rom_code = rom_code,
+            .last_discrepancy = 64,
+            .last_device_flag = false,
+        };
+
+        bool is_found = false;
+        _search(bus, &state, &is_found);
+        if (is_found)
+        {
+            result = true;
+            for (int i = 0; i < sizeof(state.rom_code.bytes) && result; ++i)
+            {
+                result = rom_code.bytes[i] == state.rom_code.bytes[i];
+                ESP_LOGD(TAG, "%02x %02x", rom_code.bytes[i], state.rom_code.bytes[i]);
+            }
+            is_found = result;
+        }
+        ESP_LOGD(TAG, "state.last_discrepancy %d, state.last_device_flag %d, is_found %d",
+                 state.last_discrepancy, state.last_device_flag, is_found);
+
+        ESP_LOGD(TAG, "rom code %sfound", result ? "" : "not ");
+        *is_present = result;
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_reset(const OneWireBus * bus, bool * a_device_present)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus || !a_device_present)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if(!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        status = bus->driver->reset(bus, a_device_present);
+    }
+
+    return status;
+}
+
+owb_status owb_read_bit(const OneWireBus * bus, uint8_t * out)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus || !out)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        bus->driver->read_bits(bus, out, 1);
+        ESP_LOGD(TAG, "owb_read_bit: %02x", *out);
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_read_byte(const OneWireBus * bus, uint8_t * out)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus || !out)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        bus->driver->read_bits(bus, out, 8);
+        ESP_LOGD(TAG, "owb_read_byte: %02x", *out);
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_read_bytes(const OneWireBus * bus, uint8_t * buffer, unsigned int len)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus || !buffer)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        for (int i = 0; i < len; ++i)
+        {
+            uint8_t out;
+            bus->driver->read_bits(bus, &out, 8);
+            buffer[i] = out;
+        }
+
+        ESP_LOGD(TAG, "owb_read_bytes, len %d:", len);
+        ESP_LOG_BUFFER_HEX_LEVEL(TAG, buffer, len, ESP_LOG_DEBUG);
+
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_write_bit(const OneWireBus * bus, const uint8_t bit)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        ESP_LOGD(TAG, "owb_write_bit: %02x", bit);
+        bus->driver->write_bits(bus, bit & 0x01u, 1);
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_write_byte(const OneWireBus * bus, uint8_t data)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        ESP_LOGD(TAG, "owb_write_byte: %02x", data);
+        bus->driver->write_bits(bus, data, 8);
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_write_bytes(const OneWireBus * bus, const uint8_t * buffer, size_t len)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus || !buffer)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        ESP_LOGD(TAG, "owb_write_bytes, len %d:", len);
+        ESP_LOG_BUFFER_HEX_LEVEL(TAG, buffer, len, ESP_LOG_DEBUG);
+
+        for (int i = 0; i < len; i++)
+        {
+            bus->driver->write_bits(bus, buffer[i], 8);
+        }
+
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+owb_status owb_write_rom_code(const OneWireBus * bus, OneWireBus_ROMCode rom_code)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        owb_write_bytes(bus, (uint8_t*)&rom_code, sizeof(rom_code));
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
+
+uint8_t owb_crc8_byte(uint8_t crc, uint8_t data)
+{
+    return _calc_crc(crc, data);
+}
+
+uint8_t owb_crc8_bytes(uint8_t crc, const uint8_t * data, size_t len)
+{
+    return _calc_crc_block(crc, data, len);
+}
+
+owb_status owb_search_first(const OneWireBus * bus, OneWireBus_SearchState * state, bool * found_device)
+{
+    bool result;
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus || !state || !found_device)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        memset(&state->rom_code, 0, sizeof(state->rom_code));
+        state->last_discrepancy = 0;
+        state->last_family_discrepancy = 0;
+        state->last_device_flag = false;
+        _search(bus, state, &result);
+        status = OWB_STATUS_OK;
+
+        *found_device = result;
+    }
+
+    return status;
+}
+
+owb_status owb_search_next(const OneWireBus * bus, OneWireBus_SearchState * state, bool * found_device)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+    bool result = false;
+
+    if (!bus || !state || !found_device)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        _search(bus, state, &result);
+        status = OWB_STATUS_OK;
+
+        *found_device = result;
+    }
+
+    return status;
+}
+
+char * owb_string_from_rom_code(OneWireBus_ROMCode rom_code, char * buffer, size_t len)
+{
+    for (int i = sizeof(rom_code.bytes) - 1; i >= 0; i--)
+    {
+        sprintf(buffer, "%02x", rom_code.bytes[i]);
+        buffer += 2;
+    }
+    return buffer;
+}
+
+owb_status owb_set_strong_pullup(const OneWireBus * bus, bool enable)
+{
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (!bus)
+    {
+        status = OWB_STATUS_PARAMETER_NULL;
+    }
+    else if (!_is_init(bus))
+    {
+        status = OWB_STATUS_NOT_INITIALIZED;
+    }
+    else
+    {
+        if (bus->use_parasitic_power && bus->strong_pullup_gpio != GPIO_NUM_NC)
+        {
+            gpio_set_level(bus->strong_pullup_gpio, enable ? 1 : 0);
+            ESP_LOGD(TAG, "strong pullup GPIO %d", enable);
+        }  // else ignore
+
+        status = OWB_STATUS_OK;
+    }
+
+    return status;
+}
--- a/components/esp32-owb/owb_gpio.c
+++ b/components/esp32-owb/owb_gpio.c
@ -0,0 +1,287 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017 David Antliff
+ * Copyright (c) 2017 Chris Morgan <chmorgan@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file
+ */
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "sdkconfig.h"
+#include "driver/gpio.h"
+
+#include "owb.h"
+#include "owb_gpio.h"
+
+static const char * TAG = "owb_gpio";
+
+// Define PHY_DEBUG to enable GPIO output around when the bus is sampled
+// by the master (this library). This GPIO output makes it possible to
+// validate the master's sampling using an oscilloscope.
+//
+// For the debug GPIO the idle state is low and made high before the 1-wire sample
+// point and low again after the sample point
+#undef PHY_DEBUG
+
+#ifdef PHY_DEBUG
+// Update these defines to a pin that you can access
+#define PHY_DEBUG_GPIO GPIO_NUM_27
+#define PHY_DEBUG_GPIO_MASK GPIO_SEL_27
+#endif
+
+/// @cond ignore
+struct _OneWireBus_Timing
+{
+    uint32_t A, B, C, D, E, F, G, H, I, J;
+};
+/// @endcond
+
+// 1-Wire timing delays (standard) in microseconds.
+// Labels and values are from https://www.maximintegrated.com/en/app-notes/index.mvp/id/126
+static const struct _OneWireBus_Timing _StandardTiming = {
+        6,    // A - read/write "1" master pull DQ low duration
+        64,   // B - write "0" master pull DQ low duration
+        60,   // C - write "1" master pull DQ high duration
+        10,   // D - write "0" master pull DQ high duration
+        9,    // E - read master pull DQ high duration
+        55,   // F - complete read timeslot + 10ms recovery
+        0,    // G - wait before reset
+        480,  // H - master pull DQ low duration
+        70,   // I - master pull DQ high duration
+        410,  // J - complete presence timeslot + recovery
+};
+
+static void _us_delay(uint32_t time_us)
+{
+    ets_delay_us(time_us);
+}
+
+/// @cond ignore
+#define info_from_bus(owb) container_of(owb, owb_gpio_driver_info, bus)
+/// @endcond
+
+/**
+ * @brief Generate a 1-Wire reset (initialization).
+ * @param[in] bus Initialised bus instance.
+ * @param[out] is_present true if device is present, otherwise false.
+ * @return status
+ */
+static owb_status _reset(const OneWireBus * bus, bool * is_present)
+{
+    bool present = false;
+    portMUX_TYPE timeCriticalMutex = portMUX_INITIALIZER_UNLOCKED;
+    portENTER_CRITICAL(&timeCriticalMutex);
+
+    owb_gpio_driver_info *i = info_from_bus(bus);
+
+    gpio_set_direction(i->gpio, GPIO_MODE_OUTPUT);
+    _us_delay(bus->timing->G);
+    gpio_set_level(i->gpio, 0);  // Drive DQ low
+    _us_delay(bus->timing->H);
+    gpio_set_direction(i->gpio, GPIO_MODE_INPUT); // Release the bus
+    gpio_set_level(i->gpio, 1);  // Reset the output level for the next output
+    _us_delay(bus->timing->I);
+
+#ifdef PHY_DEBUG
+    gpio_set_level(PHY_DEBUG_GPIO, 1);
+#endif
+
+    int level1 = gpio_get_level(i->gpio);
+
+#ifdef PHY_DEBUG
+    gpio_set_level(PHY_DEBUG_GPIO, 0);
+#endif
+
+    _us_delay(bus->timing->J);   // Complete the reset sequence recovery
+
+#ifdef PHY_DEBUG
+    gpio_set_level(PHY_DEBUG_GPIO, 1);
+#endif
+
+    int level2 = gpio_get_level(i->gpio);
+
+#ifdef PHY_DEBUG
+    gpio_set_level(PHY_DEBUG_GPIO, 0);
+#endif
+
+    portEXIT_CRITICAL(&timeCriticalMutex);
+
+    present = (level1 == 0) && (level2 == 1);   // Sample for presence pulse from slave
+    ESP_LOGD(TAG, "reset: level1 0x%x, level2 0x%x, present %d", level1, level2, present);
+
+    *is_present = present;
+
+    return OWB_STATUS_OK;
+}
+
+/**
+ * @brief Send a 1-Wire write bit, with recovery time.
+ * @param[in] bus Initialised bus instance.
+ * @param[in] bit The value to send.
+ */
+static void _write_bit(const OneWireBus * bus, int bit)
+{
+    int delay1 = bit ? bus->timing->A : bus->timing->C;
+    int delay2 = bit ? bus->timing->B : bus->timing->D;
+    owb_gpio_driver_info *i = info_from_bus(bus);
+
+    portMUX_TYPE timeCriticalMutex = portMUX_INITIALIZER_UNLOCKED;
+    portENTER_CRITICAL(&timeCriticalMutex);
+
+    gpio_set_direction(i->gpio, GPIO_MODE_OUTPUT);
+    gpio_set_level(i->gpio, 0);  // Drive DQ low
+    _us_delay(delay1);
+    gpio_set_level(i->gpio, 1);  // Release the bus
+    _us_delay(delay2);
+
+    portEXIT_CRITICAL(&timeCriticalMutex);
+}
+
+/**
+ * @brief Read a bit from the 1-Wire bus and return the value, with recovery time.
+ * @param[in] bus Initialised bus instance.
+ */
+static int _read_bit(const OneWireBus * bus)
+{
+    int result = 0;
+    owb_gpio_driver_info *i = info_from_bus(bus);
+
+    portMUX_TYPE timeCriticalMutex = portMUX_INITIALIZER_UNLOCKED;
+    portENTER_CRITICAL(&timeCriticalMutex);
+
+    gpio_set_direction(i->gpio, GPIO_MODE_OUTPUT);
+    gpio_set_level(i->gpio, 0);  // Drive DQ low
+    _us_delay(bus->timing->A);
+    gpio_set_direction(i->gpio, GPIO_MODE_INPUT); // Release the bus
+    gpio_set_level(i->gpio, 1);  // Reset the output level for the next output
+    _us_delay(bus->timing->E);
+
+#ifdef PHY_DEBUG
+    gpio_set_level(PHY_DEBUG_GPIO, 1);
+#endif
+
+    int level = gpio_get_level(i->gpio);
+
+#ifdef PHY_DEBUG
+    gpio_set_level(PHY_DEBUG_GPIO, 0);
+#endif
+
+    _us_delay(bus->timing->F);   // Complete the timeslot and 10us recovery
+
+    portEXIT_CRITICAL(&timeCriticalMutex);
+
+    result = level & 0x01;
+
+    return result;
+}
+
+/**
+ * @brief Write 1-Wire data byte.
+ * NOTE: The data is shifted out of the low bits, eg. it is written in the order of lsb to msb
+ * @param[in] bus Initialised bus instance.
+ * @param[in] data Value to write.
+ * @param[in] number_of_bits_to_read bits to write
+ */
+static owb_status _write_bits(const OneWireBus * bus, uint8_t data, int number_of_bits_to_write)
+{
+    ESP_LOGD(TAG, "write 0x%02x", data);
+    for (int i = 0; i < number_of_bits_to_write; ++i)
+    {
+        _write_bit(bus, data & 0x01);
+        data >>= 1;
+    }
+
+    return OWB_STATUS_OK;
+}
+
+/**
+ * @brief Read 1-Wire data byte from  bus.
+ * NOTE: Data is read into the high bits, eg. each bit read is shifted down before the next bit is read
+ * @param[in] bus Initialised bus instance.
+ * @return Byte value read from bus.
+ */
+static owb_status _read_bits(const OneWireBus * bus, uint8_t *out, int number_of_bits_to_read)
+{
+    uint8_t result = 0;
+    for (int i = 0; i < number_of_bits_to_read; ++i)
+    {
+        result >>= 1;
+        if (_read_bit(bus))
+        {
+            result |= 0x80;
+        }
+    }
+    ESP_LOGD(TAG, "read 0x%02x", result);
+    *out = result;
+
+    return OWB_STATUS_OK;
+}
+
+static owb_status _uninitialize(const OneWireBus * bus)
+{
+    // Nothing to do here for this driver_info
+    return OWB_STATUS_OK;
+}
+
+static const struct owb_driver gpio_function_table =
+{
+    .name = "owb_gpio",
+    .uninitialize = _uninitialize,
+    .reset = _reset,
+    .write_bits = _write_bits,
+    .read_bits = _read_bits
+};
+
+OneWireBus* owb_gpio_initialize(owb_gpio_driver_info * driver_info, int gpio)
+{
+    ESP_LOGD(TAG, "%s(): gpio %d\n", __func__, gpio);
+
+    driver_info->gpio = gpio;
+    driver_info->bus.driver = &gpio_function_table;
+    driver_info->bus.timing = &_StandardTiming;
+    driver_info->bus.strong_pullup_gpio = GPIO_NUM_NC;
+
+    // platform specific:
+    gpio_pad_select_gpio(driver_info->gpio);
+
+#ifdef PHY_DEBUG
+    gpio_config_t io_conf;
+    io_conf.intr_type = GPIO_INTR_DISABLE;
+    io_conf.mode = GPIO_MODE_OUTPUT;
+    io_conf.pin_bit_mask = PHY_DEBUG_GPIO_MASK;
+    io_conf.pull_down_en = GPIO_PULLDOWN_ENABLE;
+    io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
+    ESP_ERROR_CHECK(gpio_config(&io_conf));
+#endif
+
+    return &(driver_info->bus);
+}
--- a/components/esp32-owb/owb_rmt.c
+++ b/components/esp32-owb/owb_rmt.c
@ -0,0 +1,469 @@
+/*
+Created by Chris Morgan based on the nodemcu project driver.
+Copyright 2017 Chris Morgan <chmorgan@gmail.com>
+
+Ported to ESP32 RMT peripheral for low-level signal generation by Arnim Laeuger.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Much of the code was inspired by Derek Yerger's code, though I don't
+think much of that remains.  In any event that was..
+    (copyleft) 2006 by Derek Yerger - Free to distribute freely.
+
+The CRC code was excerpted and inspired by the Dallas Semiconductor
+sample code bearing this copyright.
+//---------------------------------------------------------------------------
+// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY,  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
+// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+// Except as contained in this notice, the name of Dallas Semiconductor
+// shall not be used except as stated in the Dallas Semiconductor
+// Branding Policy.
+//--------------------------------------------------------------------------
+*/
+
+#include "owb.h"
+
+#include "driver/rmt.h"
+#include "driver/gpio.h"
+#include "esp_log.h"
+
+#undef OW_DEBUG
+
+
+// bus reset: duration of low phase [us]
+#define OW_DURATION_RESET 480
+// overall slot duration
+#define OW_DURATION_SLOT 75
+// write 1 slot and read slot durations [us]
+#define OW_DURATION_1_LOW    2
+#define OW_DURATION_1_HIGH (OW_DURATION_SLOT - OW_DURATION_1_LOW)
+// write 0 slot durations [us]
+#define OW_DURATION_0_LOW   65
+#define OW_DURATION_0_HIGH (OW_DURATION_SLOT - OW_DURATION_0_LOW)
+// sample time for read slot
+#define OW_DURATION_SAMPLE  (15-2)
+// RX idle threshold
+// needs to be larger than any duration occurring during write slots
+#define OW_DURATION_RX_IDLE (OW_DURATION_SLOT + 2)
+
+// maximum number of bits that can be read or written per slot
+#define MAX_BITS_PER_SLOT (8)
+
+static const char * TAG = "owb_rmt";
+
+#define info_of_driver(owb) container_of(owb, owb_rmt_driver_info, bus)
+
+// flush any pending/spurious traces from the RX channel
+static void onewire_flush_rmt_rx_buf(const OneWireBus * bus)
+{
+    void * p = NULL;
+    size_t s = 0;
+
+    owb_rmt_driver_info * i = info_of_driver(bus);
+
+    while ((p = xRingbufferReceive(i->rb, &s, 0)))
+    {
+        ESP_LOGD(TAG, "flushing entry");
+        vRingbufferReturnItem(i->rb, p);
+    }
+}
+
+static owb_status _reset(const OneWireBus * bus, bool * is_present)
+{
+    rmt_item32_t tx_items[1] = {0};
+    bool _is_present = false;
+    int res = OWB_STATUS_OK;
+
+    owb_rmt_driver_info * i = info_of_driver(bus);
+
+    tx_items[0].duration0 = OW_DURATION_RESET;
+    tx_items[0].level0 = 0;
+    tx_items[0].duration1 = 0;
+    tx_items[0].level1 = 1;
+
+    uint16_t old_rx_thresh = 0;
+    rmt_get_rx_idle_thresh(i->rx_channel, &old_rx_thresh);
+    rmt_set_rx_idle_thresh(i->rx_channel, OW_DURATION_RESET + 60);
+
+    onewire_flush_rmt_rx_buf(bus);
+    rmt_rx_start(i->rx_channel, true);
+    if (rmt_write_items(i->tx_channel, tx_items, 1, true) == ESP_OK)
+    {
+        size_t rx_size = 0;
+        rmt_item32_t * rx_items = (rmt_item32_t *)xRingbufferReceive(i->rb, &rx_size, 100 / portTICK_PERIOD_MS);
+
+        if (rx_items)
+        {
+            if (rx_size >= (1 * sizeof(rmt_item32_t)))
+            {
+#ifdef OW_DEBUG
+                ESP_LOGI(TAG, "rx_size: %d", rx_size);
+
+                for (int i = 0; i < (rx_size / sizeof(rmt_item32_t)); i++)
+                {
+                    ESP_LOGI(TAG, "i: %d, level0: %d, duration %d", i, rx_items[i].level0, rx_items[i].duration0);
+                    ESP_LOGI(TAG, "i: %d, level1: %d, duration %d", i, rx_items[i].level1, rx_items[i].duration1);
+                }
+#endif
+
+                // parse signal and search for presence pulse
+                if ((rx_items[0].level0 == 0) && (rx_items[0].duration0 >= OW_DURATION_RESET - 2))
+                {
+                    if ((rx_items[0].level1 == 1) && (rx_items[0].duration1 > 0))
+                    {
+                        if (rx_items[1].level0 == 0)
+                        {
+                            _is_present = true;
+                        }
+                    }
+                }
+            }
+
+            vRingbufferReturnItem(i->rb, (void *)rx_items);
+        }
+        else
+        {
+            // time out occurred, this indicates an unconnected / misconfigured bus
+            ESP_LOGE(TAG, "rx_items == 0");
+            res = OWB_STATUS_HW_ERROR;
+        }
+    }
+    else
+    {
+        // error in tx channel
+        ESP_LOGE(TAG, "Error tx");
+        res = OWB_STATUS_HW_ERROR;
+    }
+
+    rmt_rx_stop(i->rx_channel);
+    rmt_set_rx_idle_thresh(i->rx_channel, old_rx_thresh);
+
+    *is_present = _is_present;
+
+    ESP_LOGD(TAG, "_is_present %d", _is_present);
+
+    return res;
+}
+
+static rmt_item32_t _encode_write_slot(uint8_t val)
+{
+    rmt_item32_t item = {0};
+
+    item.level0 = 0;
+    item.level1 = 1;
+    if (val)
+    {
+        // write "1" slot
+        item.duration0 = OW_DURATION_1_LOW;
+        item.duration1 = OW_DURATION_1_HIGH;
+    }
+    else
+    {
+        // write "0" slot
+        item.duration0 = OW_DURATION_0_LOW;
+        item.duration1 = OW_DURATION_0_HIGH;
+    }
+
+    return item;
+}
+
+/** NOTE: The data is shifted out of the low bits, eg. it is written in the order of lsb to msb */
+static owb_status _write_bits(const OneWireBus * bus, uint8_t out, int number_of_bits_to_write)
+{
+    rmt_item32_t tx_items[MAX_BITS_PER_SLOT + 1] = {0};
+    owb_rmt_driver_info * info = info_of_driver(bus);
+
+    if (number_of_bits_to_write > MAX_BITS_PER_SLOT)
+    {
+        return OWB_STATUS_TOO_MANY_BITS;
+    }
+
+    // write requested bits as pattern to TX buffer
+    for (int i = 0; i < number_of_bits_to_write; i++)
+    {
+        tx_items[i] = _encode_write_slot(out & 0x01);
+        out >>= 1;
+    }
+
+    // end marker
+    tx_items[number_of_bits_to_write].level0 = 1;
+    tx_items[number_of_bits_to_write].duration0 = 0;
+
+    owb_status status = OWB_STATUS_NOT_SET;
+
+    if (rmt_write_items(info->tx_channel, tx_items, number_of_bits_to_write+1, true) == ESP_OK)
+    {
+        status = OWB_STATUS_OK;
+    }
+    else
+    {
+        status = OWB_STATUS_HW_ERROR;
+        ESP_LOGE(TAG, "rmt_write_items() failed");
+    }
+
+    return status;
+}
+
+static rmt_item32_t _encode_read_slot(void)
+{
+    rmt_item32_t item = {0};
+
+    // construct pattern for a single read time slot
+    item.level0    = 0;
+    item.duration0 = OW_DURATION_1_LOW;   // shortly force 0
+    item.level1    = 1;
+    item.duration1 = OW_DURATION_1_HIGH;  // release high and finish slot
+    return item;
+}
+
+/** NOTE: Data is read into the high bits, eg. each bit read is shifted down before the next bit is read */
+static owb_status _read_bits(const OneWireBus * bus, uint8_t *in, int number_of_bits_to_read)
+{
+    rmt_item32_t tx_items[MAX_BITS_PER_SLOT + 1] = {0};
+    uint8_t read_data = 0;
+    int res = OWB_STATUS_OK;
+
+    owb_rmt_driver_info *info = info_of_driver(bus);
+
+    if (number_of_bits_to_read > MAX_BITS_PER_SLOT)
+    {
+        ESP_LOGE(TAG, "_read_bits() OWB_STATUS_TOO_MANY_BITS");
+        return OWB_STATUS_TOO_MANY_BITS;
+    }
+
+    // generate requested read slots
+    for (int i = 0; i < number_of_bits_to_read; i++)
+    {
+        tx_items[i] = _encode_read_slot();
+    }
+
+    // end marker
+    tx_items[number_of_bits_to_read].level0 = 1;
+    tx_items[number_of_bits_to_read].duration0 = 0;
+
+    onewire_flush_rmt_rx_buf(bus);
+    rmt_rx_start(info->rx_channel, true);
+    if (rmt_write_items(info->tx_channel, tx_items, number_of_bits_to_read+1, true) == ESP_OK)
+    {
+        size_t rx_size = 0;
+        rmt_item32_t *rx_items = (rmt_item32_t *)xRingbufferReceive(info->rb, &rx_size, 100 / portTICK_PERIOD_MS);
+
+        if (rx_items)
+        {
+#ifdef OW_DEBUG
+            for (int i = 0; i < rx_size / 4; i++)
+            {
+                ESP_LOGI(TAG, "level: %d, duration %d", rx_items[i].level0, rx_items[i].duration0);
+                ESP_LOGI(TAG, "level: %d, duration %d", rx_items[i].level1, rx_items[i].duration1);
+            }
+#endif
+
+            if (rx_size >= number_of_bits_to_read * sizeof(rmt_item32_t))
+            {
+                for (int i = 0; i < number_of_bits_to_read; i++)
+                {
+                    read_data >>= 1;
+                    // parse signal and identify logical bit
+                    if (rx_items[i].level1 == 1)
+                    {
+                        if ((rx_items[i].level0 == 0) && (rx_items[i].duration0 < OW_DURATION_SAMPLE))
+                        {
+                            // rising edge occured before 15us -> bit 1
+                            read_data |= 0x80;
+                        }
+                    }
+                }
+                read_data >>= 8 - number_of_bits_to_read;
+            }
+
+            vRingbufferReturnItem(info->rb, (void *)rx_items);
+        }
+        else
+        {
+            // time out occurred, this indicates an unconnected / misconfigured bus
+            ESP_LOGE(TAG, "rx_items == 0");
+            res = OWB_STATUS_HW_ERROR;
+        }
+    }
+    else
+    {
+        // error in tx channel
+        ESP_LOGE(TAG, "Error tx");
+        res = OWB_STATUS_HW_ERROR;
+    }
+
+    rmt_rx_stop(info->rx_channel);
+
+    *in = read_data;
+    return res;
+}
+
+static owb_status _uninitialize(const OneWireBus *bus)
+{
+    owb_rmt_driver_info * info = info_of_driver(bus);
+
+    rmt_driver_uninstall(info->tx_channel);
+    rmt_driver_uninstall(info->rx_channel);
+
+    return OWB_STATUS_OK;
+}
+
+static struct owb_driver rmt_function_table =
+{
+    .name = "owb_rmt",
+    .uninitialize = _uninitialize,
+    .reset = _reset,
+    .write_bits = _write_bits,
+    .read_bits = _read_bits
+};
+
+static owb_status _init(owb_rmt_driver_info *info, gpio_num_t gpio_num,
+                        rmt_channel_t tx_channel, rmt_channel_t rx_channel)
+{
+    owb_status status = OWB_STATUS_HW_ERROR;
+
+    // Ensure the RMT peripheral is not already running
+    // Note: if using RMT elsewhere, don't call this here, call it at the start of your program instead.
+    //periph_module_disable(PERIPH_RMT_MODULE);
+    //periph_module_enable(PERIPH_RMT_MODULE);
+
+    info->bus.driver = &rmt_function_table;
+    info->tx_channel = tx_channel;
+    info->rx_channel = rx_channel;
+    info->gpio = gpio_num;
+
+#ifdef OW_DEBUG
+    ESP_LOGI(TAG, "RMT TX channel: %d", info->tx_channel);
+    ESP_LOGI(TAG, "RMT RX channel: %d", info->rx_channel);
+#endif
+
+    rmt_config_t rmt_tx = {0};
+    rmt_tx.channel = info->tx_channel;
+    rmt_tx.gpio_num = gpio_num;
+    rmt_tx.mem_block_num = 1;
+    rmt_tx.clk_div = 80;
+    rmt_tx.tx_config.loop_en = false;
+    rmt_tx.tx_config.carrier_en = false;
+    rmt_tx.tx_config.idle_level = 1;
+    rmt_tx.tx_config.idle_output_en = true;
+    rmt_tx.rmt_mode = RMT_MODE_TX;
+    if (rmt_config(&rmt_tx) == ESP_OK)
+    {
+        rmt_set_source_clk(info->tx_channel, RMT_BASECLK_APB);  // only APB is supported by IDF 4.2
+        if (rmt_driver_install(rmt_tx.channel, 0, ESP_INTR_FLAG_LOWMED | ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_SHARED) == ESP_OK)
+        {
+            rmt_config_t rmt_rx = {0};
+            rmt_rx.channel = info->rx_channel;
+            rmt_rx.gpio_num = gpio_num;
+            rmt_rx.clk_div = 80;
+            rmt_rx.mem_block_num = 1;
+            rmt_rx.rmt_mode = RMT_MODE_RX;
+            rmt_rx.rx_config.filter_en = true;
+            rmt_rx.rx_config.filter_ticks_thresh = 30;
+            rmt_rx.rx_config.idle_threshold = OW_DURATION_RX_IDLE;
+            if (rmt_config(&rmt_rx) == ESP_OK)
+            {
+                rmt_set_source_clk(info->rx_channel, RMT_BASECLK_APB);  // only APB is supported by IDF 4.2
+                if (rmt_driver_install(rmt_rx.channel, 512, ESP_INTR_FLAG_LOWMED | ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_SHARED) == ESP_OK)
+                {
+                    rmt_get_ringbuf_handle(info->rx_channel, &info->rb);
+                    status = OWB_STATUS_OK;
+                }
+                else
+                {
+                    ESP_LOGE(TAG, "failed to install rx driver");
+                }
+            }
+            else
+            {
+                status = OWB_STATUS_HW_ERROR;
+                ESP_LOGE(TAG, "failed to configure rx, uninstalling rmt driver on tx channel");
+                rmt_driver_uninstall(rmt_tx.channel);
+            }
+        }
+        else
+        {
+            ESP_LOGE(TAG, "failed to install tx driver");
+        }
+    }
+    else
+    {
+        ESP_LOGE(TAG, "failed to configure tx");
+    }
+
+    // attach GPIO to previous pin
+    if (gpio_num < 32)
+    {
+        GPIO.enable_w1ts = (0x1 << gpio_num);
+    }
+    else
+    {
+        GPIO.enable1_w1ts.data = (0x1 << (gpio_num - 32));
+    }
+
+    // attach RMT channels to new gpio pin
+    // ATTENTION: set pin for rx first since gpio_output_disable() will
+    //            remove rmt output signal in matrix!
+    rmt_set_gpio(info->rx_channel, RMT_MODE_RX, gpio_num, false);
+    rmt_set_gpio(info->tx_channel, RMT_MODE_TX, gpio_num, false);
+
+    // force pin direction to input to enable path to RX channel
+    PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[gpio_num]);
+
+    // enable open drain
+    GPIO.pin[gpio_num].pad_driver = 1;
+
+    return status;
+}
+
+OneWireBus * owb_rmt_initialize(owb_rmt_driver_info * info, gpio_num_t gpio_num,
+                                rmt_channel_t tx_channel, rmt_channel_t rx_channel)
+{
+    ESP_LOGD(TAG, "%s: gpio_num: %d, tx_channel: %d, rx_channel: %d",
+             __func__, gpio_num, tx_channel, rx_channel);
+
+    owb_status status = _init(info, gpio_num, tx_channel, rx_channel);
+    if (status != OWB_STATUS_OK)
+    {
+        ESP_LOGE(TAG, "_init() failed with status %d", status);
+    }
+
+    info->bus.strong_pullup_gpio = GPIO_NUM_NC;
+
+    return &(info->bus);
+}
--- a/components/modbus_slave/CMakeLists.txt
+++ b/components/modbus_slave/CMakeLists.txt
@ -0,0 +1,7 @@
+set(COMPONENT_ADD_INCLUDEDIRS include)
+set(COMPONENT_SRCS
+    "src/modbus.c"
+    "src/pp/payload_builder.c"
+    "src/pp/payload_parser.c")
+
+register_component()
--- a/components/modbus_slave/README.txt
+++ b/components/modbus_slave/README.txt
@ -0,0 +1 @@
+modbus slave
--- a/components/modbus_slave/component.mk
+++ b/components/modbus_slave/component.mk
@ -0,0 +1,3 @@
+
+COMPONENT_SRCDIRS := src
+COMPONENT_ADD_INCLUDEDIRS := include
--- a/components/modbus_slave/include/modbus.h
+++ b/components/modbus_slave/include/modbus.h
@ -0,0 +1,103 @@
+/**
+ * Modbus slave
+ */
+
+#ifndef MODBUS_H
+#define MODBUS_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/types.h>
+
+// Config - TODO do this via cmake
+//#define MB_SUPPORT_FC01  // READ_COILS
+//#define MB_SUPPORT_FC02  // READ_DISCRETES
+#define MB_SUPPORT_FC03  // READ_HOLDING_REGISTERS
+#define MB_SUPPORT_FC04  // READ_INPUT_REGISTERS
+//#define MB_SUPPORT_FC05  // WRITE_SINGLE_COIL
+#define MB_SUPPORT_FC06  // WRITE_SINGLE_REGISTER
+//#define MB_SUPPORT_FC15  // WRITE_MULTIPLE_COILS
+#define MB_SUPPORT_FC16  // WRITE_MULTIPLE_REGISTERS
+//#define MB_SUPPORT_FC22  // MASK_WRITE_REGISTER
+//#define MB_SUPPORT_FC23  // READ_WRITE_MULTIPLE_REGISTERS
+
+typedef enum ModbusException {
+  MB_EXCEPTION_OK = 0,
+  MB_EXCEPTION_ILLEGAL_FUNCTION = 1,
+  MB_EXCEPTION_ILLEGAL_DATA_ADDRESS = 2,
+  MB_EXCEPTION_ILLEGAL_DATA_VALUE = 3,
+  MB_EXCEPTION_SLAVE_DEVICE_FAILURE = 4,
+  // other codes exist but are not meaningful for simple slave devices
+} ModbusException_t;
+
+typedef enum ModbusFunction {
+  FC01_READ_COILS = 1,
+  FC02_READ_DISCRETES = 2,
+  FC03_READ_HOLDING_REGISTERS = 3,
+  FC04_READ_INPUT_REGISTERS = 4,
+  FC05_WRITE_SINGLE_COIL = 5,
+  FC06_WRITE_SINGLE_REGISTER = 6,
+  FC15_WRITE_MULTIPLE_COILS = 15,
+  FC16_WRITE_MULTIPLE_REGISTERS = 16,
+  FC22_MASK_WRITE_REGISTER = 22,
+  FC23_READ_WRITE_MULTIPLE_REGISTERS = 23,
+} ModbusFunction_t;
+
+typedef enum ModbusError {
+  MB_OK = 0,
+  MB_ERROR = 1,
+  MB_ERR_NOTFORME = 2,
+  MB_ERR_NEEDMORE = 3,
+  MB_ERR_CHECKSUM = 4,
+  MB_ERR_BADPROTO = 5,
+} ModbusError_t;
+
+typedef enum ModbusProtocol {
+  MB_PROTO_RTU,
+  MB_PROTO_TCP
+} ModbusProtocol_t;
+
+typedef struct ModbusSlave ModbusSlave_t;
+
+struct ModbusSlave {
+  uint8_t addr;
+  ModbusProtocol_t proto;
+  void *userData;
+  ModbusException_t (*startOfAccess)(ModbusSlave_t *ms, ModbusFunction_t fcx, uint8_t slave_id);
+  void (*endOfAccess)(ModbusSlave_t *ms);
+
+#ifdef MB_SUPPORT_FC01
+  ModbusException_t (*readCoil)(ModbusSlave_t *ms, uint16_t reference, bool *value);
+#endif
+
+#ifdef MB_SUPPORT_FC02
+  ModbusException_t (*readDiscrete)(ModbusSlave_t *ms, uint16_t reference, bool *value);
+#endif
+
+#if defined(MB_SUPPORT_FC03) || defined(MB_SUPPORT_FC22) || defined(MB_SUPPORT_FC23)
+  ModbusException_t (*readHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
+#endif
+
+#ifdef MB_SUPPORT_FC04
+  ModbusException_t (*readInput)(ModbusSlave_t *ms, uint16_t reference, uint16_t *value);
+#endif
+
+#if defined(MB_SUPPORT_FC15) || defined(MB_SUPPORT_FC05)
+  ModbusException_t (*writeCoil)(ModbusSlave_t *ms, uint16_t reference, bool value);
+#endif
+
+#if defined(MB_SUPPORT_FC06) || defined(MB_SUPPORT_FC16) || defined(MB_SUPPORT_FC22) || defined(MB_SUPPORT_FC23)
+  ModbusException_t (*writeHolding)(ModbusSlave_t *ms, uint16_t reference, uint16_t value);
+#endif
+};
+
+ModbusError_t mb_handleRequest(
+        ModbusSlave_t *ms,
+        const uint8_t *req,
+        size_t req_size,
+        uint8_t* resp,
+        size_t resp_capacity,
+        size_t *resp_size
+);
+
+#endif //MODBUS_H
--- a/components/modbus_slave/include/pp/payload_builder.h
+++ b/components/modbus_slave/include/pp/payload_builder.h
@ -0,0 +1,129 @@
+#ifndef PAYLOAD_BUILDER_H
+#define PAYLOAD_BUILDER_H
+
+/**
+ * PayloadBuilder, part of the TinyFrame utilities collection
+ *
+ * (c) Ondřej Hruška, 2014-2022. MIT license.
+ *
+ * The builder supports big and little endian which is selected when
+ * initializing it or by accessing the bigendian struct field.
+ *
+ * This module helps you with building payloads (not only for TinyFrame)
+ *
+ * The builder performs bounds checking and calls the provided handler when
+ * the requested write wouldn't fit. Use the handler to realloc / flush the buffer
+ * or report an error.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include "type_coerce.h"
+
+typedef struct PayloadBuilder_ PayloadBuilder;
+
+/**
+ * Full buffer handler.
+ *
+ * 'needed' more bytes should be written but the end of the buffer was reached.
+ *
+ * Return true if the problem was solved (e.g. buffer was flushed and the
+ * 'current' pointer moved to the beginning).
+ *
+ * If false is returned, the 'ok' flag on the struct is set to false
+ * and all following writes are discarded.
+ */
+typedef bool (*pb_full_handler)(PayloadBuilder *pb, uint32_t needed);
+
+struct PayloadBuilder_ {
+  uint8_t *start;   //!< Pointer to the beginning of the buffer
+  uint8_t *current; //!< Pointer to the next byte to be read
+  uint8_t *end;     //!< Pointer to the end of the buffer (start + length)
+  pb_full_handler full_handler; //!< Callback for buffer overrun
+  bool bigendian;   //!< Flag to use big-endian parsing
+  bool ok;          //!< Indicates that all reads were successful
+};
+
+// --- initializer helper macros ---
+
+/** Start the builder. */
+#define pb_start_e(buf, capacity, bigendian, full_handler) ((PayloadBuilder){buf, buf, (buf)+(capacity), full_handler, bigendian, 1})
+
+/** Start the builder in big-endian mode */
+#define pb_start_be(buf, capacity, full_handler) pb_start_e(buf, capacity, 1, full_handler)
+
+/** Start the builder in little-endian mode */
+#define pb_start_le(buf, capacity, full_handler) pb_start_e(buf, capacity, 0, full_handler)
+
+/** Start the parser in little-endian mode (default) */
+#define pb_start(buf, capacity, full_handler) pb_start_le(buf, capacity, full_handler)
+
+// --- utilities ---
+
+/** Returns true if the parser is still in OK state (not overrun) */
+#define pb_ok(pb) ((pb)->ok)
+
+/** Get already used bytes count */
+#define pb_length(pb) ((pb)->current - (pb)->start)
+
+/** Reset the current pointer to start */
+#define pb_rewind(pb) do { (pb)->current = (pb)->start; } while (0)
+
+/** save & restore position */
+typedef uint8_t* pb_mark_t;
+#define pb_save(pb) ((pb)->current)
+#define pb_restore(pb, mark) do { (pb)->current = (mark); } while (0)
+
+/** Write from a buffer */
+bool pb_buf(PayloadBuilder *pb, const uint8_t *buf, uint32_t len);
+
+/** Write a zero terminated string */
+bool pb_string(PayloadBuilder *pb, const char *str);
+
+/** Write uint8_t to the buffer */
+bool pb_u8(PayloadBuilder *pb, uint8_t byte);
+
+/** Write boolean to the buffer. */
+static inline bool pb_bool(PayloadBuilder *pb, bool b)
+{
+    return pb_u8(pb, (uint8_t) b);
+}
+
+/** Write uint16_t to the buffer. */
+bool pb_u16(PayloadBuilder *pb, uint16_t word);
+
+/** Write uint32_t to the buffer. */
+bool pb_u32(PayloadBuilder *pb, uint32_t word);
+
+/** Write int8_t to the buffer. */
+static inline bool pb_i8(PayloadBuilder *pb, int8_t byte)
+{
+    return pb_u8(pb, ((union conv8) {.i8 = byte}).u8);
+}
+
+/** Write char (int8_t) to the buffer. */
+static inline bool pb_char(PayloadBuilder *pb, char c)
+{
+    return pb_i8(pb, c);
+}
+
+/** Write int16_t to the buffer. */
+static inline bool pb_i16(PayloadBuilder *pb, int16_t word)
+{
+    return pb_u16(pb, ((union conv16) {.i16 = word}).u16);
+}
+
+/** Write int32_t to the buffer. */
+static inline bool pb_i32(PayloadBuilder *pb, int32_t word)
+{
+    return pb_u32(pb, ((union conv32) {.i32 = word}).u32);
+}
+
+/** Write 4-byte float to the buffer. */
+static inline bool pb_float(PayloadBuilder *pb, float f)
+{
+    return pb_u32(pb, ((union conv32) {.f32 = f}).u32);
+}
+
+#endif // PAYLOAD_BUILDER_H
--- a/components/modbus_slave/include/pp/payload_parser.h
+++ b/components/modbus_slave/include/pp/payload_parser.h
@ -0,0 +1,167 @@
+#ifndef PAYLOAD_PARSER_H
+#define PAYLOAD_PARSER_H
+
+/**
+ * PayloadParser, part of the TinyFrame utilities collection
+ *
+ * (c) Ondřej Hruška, 2016-2022. MIT license.
+ *
+ * This module helps you with parsing payloads (not only from TinyFrame).
+ *
+ * The parser supports big and little-endian which is selected when
+ * initializing it or by accessing the bigendian struct field.
+ *
+ * The parser performs bounds checking and calls the provided handler when
+ * the requested read doesn't have enough data. Use the callback to take
+ * appropriate action, e.g. report an error.
+ *
+ * If the handler function is not defined, the pb->ok flag is set to false
+ * (use this to check for success), and further reads won't have any effect
+ * and always result in 0 or empty array.
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+#include "type_coerce.h"
+
+typedef struct PayloadParser_ PayloadParser;
+
+/**
+ * Empty buffer handler.
+ *
+ * 'needed' more bytes should be read but the end was reached.
+ *
+ * Return true if the problem was solved (e.g. new data loaded into
+ * the buffer and the 'current' pointer moved to the beginning).
+ *
+ * If false is returned, the 'ok' flag on the struct is set to false
+ * and all following reads will fail / return 0.
+ */
+typedef bool (*pp_empty_handler)(PayloadParser *pp, uint32_t needed);
+
+struct PayloadParser_ {
+    const uint8_t *start;   //!< Pointer to the beginning of the buffer
+    const uint8_t *current; //!< Pointer to the next byte to be read
+    const uint8_t *end;     //!< Pointer to the end of the buffer (start + length)
+    pp_empty_handler empty_handler; //!< Callback for buffer underrun
+    bool bigendian;   //!< Flag to use big-endian parsing
+    bool ok;          //!< Indicates that all reads were successful
+};
+
+// --- initializer helper macros ---
+
+/** Start the parser. */
+#define pp_start_e(buf, length, bigendian, empty_handler) ((PayloadParser){buf, buf, (buf)+(length), empty_handler, bigendian, 1})
+
+/** Start the parser in big-endian mode */
+#define pp_start_be(buf, length, empty_handler) pp_start_e(buf, length, 1, empty_handler)
+
+/** Start the parser in little-endian mode */
+#define pp_start_le(buf, length, empty_handler) pp_start_e(buf, length, 0, empty_handler)
+
+/** Start the parser in little-endian mode (default) */
+#define pp_start(buf, length, empty_handler) pp_start_le(buf, length, empty_handler)
+
+// --- utilities ---
+
+/** Get remaining length */
+#define pp_remains(pp) ((pp)->end - (pp)->current)
+
+/** Reset the current pointer to start */
+#define pp_rewind(pp) do { (pp)->current = (pp)->start; } while (0)
+
+/** save & restore position */
+typedef const uint8_t* pp_mark_t;
+#define pp_save(pp) ((pp)->current)
+#define pp_restore(pp, mark) do { (pp)->current = (mark); } while (0)
+
+/** Returns true if the parser is still in OK state (not overrun) */
+#define pp_ok(pp) ((pp)->ok)
+/** Returns true if end was reached */
+#define pp_end(pp) ((pp)->end == (pp)->current)
+
+/**
+ * @brief Get the remainder of the buffer.
+ *
+ * Returns NULL and sets 'length' to 0 if there are no bytes left.
+ *
+ * @param pp
+ * @param length : here the buffer length will be stored. NULL to do not store.
+ * @return the remaining portion of the input buffer
+ */
+const uint8_t *pp_tail(PayloadParser *pp, uint32_t *length);
+
+/** Read uint8_t from the payload. */
+uint8_t pp_u8(PayloadParser *pp);
+
+/** Read bool from the payload. */
+static inline bool pp_bool(PayloadParser *pp)
+{
+    return pp_u8(pp) != 0;
+}
+
+/** Skip bytes */
+static inline void pp_skip(PayloadParser *pp, uint32_t num)
+{
+    pp->current += num;
+}
+
+/** Read uint16_t from the payload. */
+uint16_t pp_u16(PayloadParser *pp);
+
+/** Read uint32_t from the payload. */
+uint32_t pp_u32(PayloadParser *pp);
+
+/** Read int8_t from the payload. */
+static inline int8_t pp_i8(PayloadParser *pp)
+{
+    return ((union conv8) {.u8 = pp_u8(pp)}).i8;
+}
+
+/** Read char (int8_t) from the payload. */
+static inline int8_t pp_char(PayloadParser *pp)
+{
+    return pp_i8(pp);
+}
+
+/** Read int16_t from the payload. */
+static inline int16_t pp_i16(PayloadParser *pp)
+{
+    return ((union conv16) {.u16 = pp_u16(pp)}).i16;
+}
+
+/** Read int32_t from the payload. */
+static inline int32_t pp_i32(PayloadParser *pp)
+{
+    return ((union conv32) {.u32 = pp_u32(pp)}).i32;
+}
+
+/** Read 4-byte float from the payload. */
+static inline float pp_float(PayloadParser *pp)
+{
+    return ((union conv32) {.u32 = pp_u32(pp)}).f32;
+}
+
+/**
+ * Parse a zero-terminated string
+ *
+ * @param pp - parser
+ * @param buffer - target buffer
+ * @param maxlen - buffer size
+ * @return actual number of bytes, excluding terminator
+ */
+uint32_t pp_string(PayloadParser *pp, char *buffer, uint32_t maxlen);
+
+/**
+ * Parse a buffer
+ *
+ * @param pp - parser
+ * @param buffer - target buffer
+ * @param maxlen - buffer size
+ * @return actual number of bytes, excluding terminator
+ */
+uint32_t pp_buf(PayloadParser *pp, uint8_t *buffer, uint32_t maxlen);
+
+
+#endif // PAYLOAD_PARSER_H
--- a/components/modbus_slave/include/pp/type_coerce.h
+++ b/components/modbus_slave/include/pp/type_coerce.h
@ -0,0 +1,32 @@
+#ifndef TYPE_COERCE_H
+#define TYPE_COERCE_H
+
+/**
+ * Structs for conversion between types,
+ * part of the TinyFrame utilities collection
+ * 
+ * (c) Ondřej Hruška, 2016-2017. MIT license.
+ * 
+ * This is a support header file for PayloadParser and PayloadBuilder.
+ */
+
+#include <stdint.h>
+#include <stddef.h>
+
+union conv8 {
+    uint8_t u8;
+    int8_t i8;
+};
+
+union conv16 {
+    uint16_t u16;
+    int16_t i16;
+};
+
+union conv32 {
+    uint32_t u32;
+    int32_t i32;
+    float f32;
+};
+
+#endif // TYPE_COERCE_H
--- a/components/modbus_slave/src/modbus.c
+++ b/components/modbus_slave/src/modbus.c
@ -0,0 +1,475 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include "pp/payload_parser.h"
+#include "pp/payload_builder.h"
+#include "modbus.h"
+
+/**
+ * Function to calculate MODBUS CRC.
+ *
+ * https://github.com/starnight/MODBUS-CRC/blob/master/modbuscrc.c
+ **/
+static uint16_t crc16_update(uint16_t crc, uint8_t a)
+{
+    int i;
+    crc ^= (uint16_t) a;
+    for (i = 0; i < 8; ++i) {
+        if (crc & 1) {
+            crc = (crc >> 1) ^ 0xA001;
+        } else {
+            crc = (crc >> 1);
+        }
+    }
+    return crc;
+}
+
+static inline uint16_t crc16_init()
+{
+    return 0xFFFF;
+}
+
+/**
+ * Handle a modbus request
+ */
+ModbusError_t mb_handleRequest(
+        ModbusSlave_t *ms,
+        const uint8_t *req,
+        size_t req_size,
+        uint8_t *resp,
+        size_t resp_capacity,
+        size_t *resp_size
+)
+{
+    uint16_t txn_id, protocol_id, ref;
+
+#ifdef MB_SUPPORT_FC22
+    uint16_t and_mask, or_mask;
+#endif
+
+#ifdef MB_SUPPORT_FC23
+    uint16_t ref2, count2;
+#endif
+
+#if defined(MB_SUPPORT_FC01) || defined(MB_SUPPORT_FC02)
+    bool bvalue;
+#endif
+
+#if defined(MB_SUPPORT_FC03) || defined(MB_SUPPORT_FC04) \
+    || defined(MB_SUPPORT_FC16) || defined(MB_SUPPORT_FC22) || defined(MB_SUPPORT_FC23) \
+    || defined(MB_SUPPORT_FC05) || defined(MB_SUPPORT_FC06)
+    uint16_t value;
+#endif
+
+#if defined(MB_SUPPORT_FC01) || defined(MB_SUPPORT_FC02) || defined(MB_SUPPORT_FC15)
+    uint8_t scratch, bytecount, bitcnt;
+#endif
+
+#if defined(MB_SUPPORT_FC01) || defined(MB_SUPPORT_FC02) || defined(MB_SUPPORT_FC03) \
+    || defined(MB_SUPPORT_FC04) || defined(MB_SUPPORT_FC15) || defined(MB_SUPPORT_FC16) \
+    || defined(MB_SUPPORT_FC23)
+    uint16_t count;
+#endif
+
+    ModbusException_t exc = MB_EXCEPTION_OK;
+    size_t numbytes;
+    uint8_t fcx;
+
+    const size_t TCP_RESP_OVERHEAD = 8;
+    const size_t RTU_RESP_OVERHEAD = 4;
+    const size_t overhead = ms->proto == MB_PROTO_TCP ? TCP_RESP_OVERHEAD : RTU_RESP_OVERHEAD;
+    pb_mark_t resp_fc_mark = NULL, resp_len_mark = NULL, resp_pld_start_mark = NULL;
+
+    const bool tcp = ms->proto == MB_PROTO_TCP;
+    PayloadParser pp = pp_start_be(req, req_size, NULL);
+    PayloadBuilder pb = pb_start_be(resp, resp_capacity, NULL);
+
+    if (tcp) {
+        /* Parse header */
+        txn_id = pp_u16(&pp);
+        protocol_id = pp_u16(&pp);
+        pp_skip(&pp, 2); // msglen
+        if (protocol_id != 0) {
+            return MB_ERR_BADPROTO;
+        }
+    } else {
+        /* check  CRC */
+        uint16_t crc = crc16_init();
+        for (int pos = 0; pos < req_size /* size of CRC */; pos++) {
+            crc = crc16_update(crc, pp_u8(&pp));
+        }
+        if (crc != 0) {
+            return MB_ERR_CHECKSUM;
+        }
+        pp_rewind(&pp);
+    }
+
+    const uint8_t slave_id = pp_u8(&pp);
+
+    /* check addressing (don't check for TCP - UnitID is used e.g. for gateway target devices) */
+    if (!tcp && slave_id != ms->addr) {
+        return MB_ERR_NOTFORME;
+    }
+
+    fcx = pp_u8(&pp);
+
+    if (!pp_ok(&pp)) {
+        return MB_ERR_NEEDMORE;
+    }
+
+    /* start building the response */
+    if (tcp) {
+        pb_u16(&pb, txn_id);
+        pb_u16(&pb, protocol_id);
+        resp_len_mark = pb_save(&pb);
+        pb_u16(&pb, 0); // Placeholder for LEN
+    }
+    pb_u8(&pb, slave_id);
+    resp_fc_mark = pb_save(&pb);
+    pb_u8(&pb, fcx); // Exceptions will add 0x80 to this
+    resp_pld_start_mark = pb_save(&pb);
+
+    if (ms->startOfAccess) {
+        exc = ms->startOfAccess(ms, fcx, slave_id);
+        if (exc != 0) {
+            goto exception;
+        }
+    }
+
+    switch (fcx) {
+#ifdef MB_SUPPORT_FC05
+        case FC05_WRITE_SINGLE_COIL:
+            if (!ms->writeCoil) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+            ref = pp_u16(&pp);
+            value = pp_u16(&pp);
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            if (resp_capacity < 4 + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            if (value == 0xFF00) {
+                exc = ms->writeCoil(ms, ref, true);
+            } else {
+                exc = ms->writeCoil(ms, ref, false);
+            }
+            if (exc != 0) {
+                goto exception;
+            }
+            pb_u16(&pb, ref);
+            pb_u16(&pb, value);
+            break;
+#endif
+
+#if defined(MB_SUPPORT_FC01) || defined(MB_SUPPORT_FC02)
+        case FC01_READ_COILS:
+        case FC02_READ_DISCRETES:
+            /* check we have the needed function */
+#ifdef MB_SUPPORT_FC01
+            if (fcx == FC01_READ_COILS && !ms->readCoil) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+#endif
+#ifdef MB_SUPPORT_FC02
+            if (fcx == FC02_READ_DISCRETES && !ms->readDiscrete) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+#endif
+            ref = pp_u16(&pp);
+            count = pp_u16(&pp);
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            bytecount = (count + 7) / 8;
+            if (count > 255 * 8 || resp_capacity < bytecount + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            pb_u8(&pb, bytecount);
+            bitcnt = 0;
+            scratch = 0;
+            while (count-- > 0) {
+#ifdef MB_SUPPORT_FC01
+                if (fcx == FC01_READ_COILS) {
+                    exc = ms->readCoil(ms, ref++, &bvalue);
+                }
+#endif
+#ifdef MB_SUPPORT_FC02
+                if (fcx == FC02_READ_DISCRETES) {
+                    exc = ms->readDiscrete(ms, ref++, &bvalue);
+                }
+#endif
+                if (exc != 0) {
+                    goto exception;
+                }
+                scratch |= ((bvalue & 1) << bitcnt);
+                bitcnt++;
+                if (bitcnt == 8) {
+                    pb_u8(&pb, scratch);
+                    scratch = 0;
+                    bitcnt = 0;
+                }
+            }
+            if (bitcnt != 0) {
+                pb_u8(&pb, scratch);
+            }
+            break;
+#endif
+
+#if defined(MB_SUPPORT_FC03) || defined(MB_SUPPORT_FC04)
+        case FC03_READ_HOLDING_REGISTERS:
+        case FC04_READ_INPUT_REGISTERS:
+#ifdef MB_SUPPORT_FC03
+            /* check we have the needed function */
+            if (fcx == FC03_READ_HOLDING_REGISTERS && !ms->readHolding) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+#endif
+#ifdef MB_SUPPORT_FC04
+            if (fcx == FC04_READ_INPUT_REGISTERS && !ms->readInput) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+#endif
+            ref = pp_u16(&pp);
+            count = pp_u16(&pp);
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            if (count > 255 || resp_capacity < count * 2 + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            pb_u8(&pb, count*2);
+            while (count-- > 0) {
+#ifdef MB_SUPPORT_FC03
+                if (fcx == FC03_READ_HOLDING_REGISTERS) {
+                    exc = ms->readHolding(ms, ref++, &value);
+                }
+#endif
+#ifdef MB_SUPPORT_FC04
+                if (fcx == FC04_READ_INPUT_REGISTERS) {
+                    exc = ms->readInput(ms, ref++, &value);
+                }
+#endif
+                if (exc != 0) {
+                    goto exception;
+                }
+                pb_u16(&pb, value);
+            }
+            break;
+#endif
+
+#ifdef MB_SUPPORT_FC06
+        case FC06_WRITE_SINGLE_REGISTER:
+            if (!ms->writeHolding) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+            ref = pp_u16(&pp);
+            value = pp_u16(&pp);
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            if (resp_capacity < 4 + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            exc = ms->writeHolding(ms, ref, value);
+            if (exc != 0) {
+                goto exception;
+            }
+            pb_u16(&pb, ref);
+            pb_u16(&pb, value);
+            break;
+#endif
+
+#ifdef MB_SUPPORT_FC16
+        case FC16_WRITE_MULTIPLE_REGISTERS:
+            if (!ms->writeHolding) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+            ref = pp_u16(&pp);
+            count = pp_u16(&pp);
+            pp_skip(&pp, 1); // this is always count * 2
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            if (count > 255 || resp_capacity < 4 + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            if (pp_remains(&pp) < count * 2 + (tcp ? 0 : 2)) {
+                return MB_ERR_NEEDMORE;
+            }
+            pb_u16(&pb, ref);
+            pb_u16(&pb, count);
+            while (count-- > 0) {
+                value = pp_u16(&pp);
+                exc = ms->writeHolding(ms, ref++, value);
+                if (exc != 0) {
+                    goto exception;
+                }
+            }
+            break;
+#endif
+
+#ifdef MB_SUPPORT_FC15
+        case FC15_WRITE_MULTIPLE_COILS:
+            if (!ms->writeCoil) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+            ref = pp_u16(&pp);
+            count = pp_u16(&pp);
+            bytecount = pp_u8(&pp);
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            if (count > 255 || resp_capacity < 4 + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            if (pp_remains(&pp) < bytecount + (tcp ? 0 : 2)) {
+                return MB_ERR_NEEDMORE;
+            }
+            pb_u16(&pb, ref);
+            pb_u16(&pb, count);
+            bitcnt = 8;
+            scratch = 0;
+            while (count-- > 0) {
+                if (bitcnt == 8) {
+                    scratch = pp_u8(&pp);
+                    bitcnt = 0;
+                }
+                exc = ms->writeCoil(ms, ref++, (scratch >> bitcnt) & 1);
+                bitcnt++;
+                if (exc != 0) {
+                    goto exception;
+                }
+            }
+            break;
+#endif
+
+#ifdef MB_SUPPORT_FC22
+        case FC22_MASK_WRITE_REGISTER:
+            if (!ms->writeHolding || !ms->readHolding) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+            ref = pp_u16(&pp);
+            and_mask = pp_u16(&pp);
+            or_mask = pp_u16(&pp);
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            if (resp_capacity < 4 + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            exc = ms->readHolding(ms, ref, &value);
+            if (exc != 0) {
+                goto exception;
+            }
+
+            value = (value & and_mask) | (or_mask & ~and_mask);
+            exc = ms->writeHolding(ms, ref, value);
+            if (exc != 0) {
+                goto exception;
+            }
+
+            pb_u16(&pb, ref);
+            pb_u16(&pb, and_mask);
+            pb_u16(&pb, or_mask);
+            break;
+#endif
+
+#ifdef MB_SUPPORT_FC23
+        case FC23_READ_WRITE_MULTIPLE_REGISTERS:
+            if (!ms->writeHolding || !ms->readHolding) {
+                exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+                goto exception;
+            }
+            // read
+            ref = pp_u16(&pp);
+            count = pp_u16(&pp);
+            // write
+            ref2 = pp_u16(&pp);
+            count2 = pp_u16(&pp);
+            pp_skip(&pp, 1); // qty of bytes
+            if (!pp_ok(&pp)) {
+                return MB_ERR_NEEDMORE;
+            }
+            if (count > 255 || count2 > 255 || resp_capacity < count * 2 + overhead) {
+                exc = MB_EXCEPTION_ILLEGAL_DATA_ADDRESS; // TODO?
+                goto exception;
+            }
+            if (pp_remains(&pp) < count2 * 2 + (tcp ? 0 : 2)) {
+                return MB_ERR_NEEDMORE;
+            }
+            pb_u8(&pb, 2 * count);
+            // First, write
+            while (count2-- > 0) {
+                value = pp_u16(&pp);
+                exc = ms->writeHolding(ms, ref2++, value);
+                if (exc != 0) {
+                    goto exception;
+                }
+            }
+            // Second, read
+            while (count-- > 0) {
+                exc = ms->readHolding(ms, ref++, &value);
+                if (exc != 0) {
+                    goto exception;
+                }
+                pb_u16(&pb, value);
+            }
+            break;
+#endif
+
+        default:
+            exc = MB_EXCEPTION_ILLEGAL_FUNCTION;
+            goto exception;
+    }
+    goto checksum;
+
+    exception:;
+    *resp_fc_mark |= 0x80;
+    pb_restore(&pb, resp_pld_start_mark);
+    pb_u8(&pb, (uint8_t) exc);
+    goto checksum;
+
+    checksum:
+    numbytes = pb_length(&pb);
+    if (tcp) {
+        pb_restore(&pb, resp_len_mark);
+        pb_u16(&pb, numbytes - 6);
+        *resp_size = numbytes;
+    } else {
+        uint8_t *m = pb.start;
+        uint16_t crc = crc16_init();
+        *resp_size = numbytes + 2;
+        while (numbytes > 0) {
+            crc = crc16_update(crc, *m++);
+            numbytes--;
+        }
+        pb.bigendian = 0; // CRC is sent as little endian?
+        pb_u16(&pb, crc);
+    }
+
+    if (!pb_ok(&pb)) {
+        return MB_ERROR;
+    }
+
+    if (ms->endOfAccess) {
+        ms->endOfAccess(ms);
+    }
+    return MB_OK;
+}
--- a/components/modbus_slave/src/pp/payload_builder.c
+++ b/components/modbus_slave/src/pp/payload_builder.c
@ -0,0 +1,87 @@
+#include <string.h>
+#include "pp/payload_builder.h"
+
+#define pb_check_capacity(pb, needed)                                                   \
+    if ((pb)->current + (needed) > (pb)->end) {                                         \
+        if ((pb)->full_handler == NULL || !(pb)->full_handler((pb), (needed))) {        \
+            (pb)->ok = 0;                                                               \
+        }                                                                               \
+    }
+
+/** Write from a buffer */
+bool pb_buf(PayloadBuilder *pb, const uint8_t *buf, uint32_t len)
+{
+    pb_check_capacity(pb, len);
+    if (!pb->ok) { return false; }
+
+    memcpy(pb->current, buf, len);
+    pb->current += len;
+    return true;
+}
+
+/** Write s zero terminated string */
+bool pb_string(PayloadBuilder *pb, const char *str)
+{
+    uint32_t len = (uint32_t) strlen(str);
+    pb_check_capacity(pb, len + 1);
+    if (!pb->ok) {
+        return false;
+    }
+
+    memcpy(pb->current, str, len + 1);
+    pb->current += len + 1;
+    return true;
+}
+
+/** Write uint8_t to the buffer */
+bool pb_u8(PayloadBuilder *pb, uint8_t byte)
+{
+    pb_check_capacity(pb, 1);
+    if (!pb->ok) {
+        return false;
+    }
+
+    *pb->current++ = byte;
+    return true;
+}
+
+/** Write uint16_t to the buffer. */
+bool pb_u16(PayloadBuilder *pb, uint16_t word)
+{
+    pb_check_capacity(pb, 2);
+    if (!pb->ok) {
+        return false;
+    }
+
+    if (pb->bigendian) {
+        *pb->current++ = (uint8_t) ((word >> 8) & 0xFF);
+        *pb->current++ = (uint8_t) (word & 0xFF);
+    } else {
+        *pb->current++ = (uint8_t) (word & 0xFF);
+        *pb->current++ = (uint8_t) ((word >> 8) & 0xFF);
+    }
+    return true;
+}
+
+/** Write uint32_t to the buffer. */
+bool pb_u32(PayloadBuilder *pb, uint32_t word)
+{
+    pb_check_capacity(pb, 4);
+    if (!pb->ok) {
+        return false;
+    }
+
+    if (pb->bigendian) {
+        *pb->current++ = (uint8_t) ((word >> 24) & 0xFF);
+        *pb->current++ = (uint8_t) ((word >> 16) & 0xFF);
+        *pb->current++ = (uint8_t) ((word >> 8) & 0xFF);
+        *pb->current++ = (uint8_t) (word & 0xFF);
+    } else {
+        *pb->current++ = (uint8_t) (word & 0xFF);
+        *pb->current++ = (uint8_t) ((word >> 8) & 0xFF);
+        *pb->current++ = (uint8_t) ((word >> 16) & 0xFF);
+        *pb->current++ = (uint8_t) ((word >> 24) & 0xFF);
+    }
+    return true;
+}
+
--- a/components/modbus_slave/src/pp/payload_parser.c
+++ b/components/modbus_slave/src/pp/payload_parser.c
@ -0,0 +1,104 @@
+#include "pp/payload_parser.h"
+
+#define pp_check_capacity(pp, needed)                                               \
+    if ((pp)->current + (needed) > (pp)->end) {                                     \
+        if ((pp)->empty_handler == NULL || !(pp)->empty_handler((pp), (needed))) {  \
+            (pp)->ok = 0;                                                           \
+        }                                                                           \
+    }
+
+uint8_t pp_u8(PayloadParser *pp)
+{
+    pp_check_capacity(pp, 1);
+    if (!pp->ok) {
+        return 0;
+    }
+
+    return *pp->current++;
+}
+
+uint16_t pp_u16(PayloadParser *pp)
+{
+    pp_check_capacity(pp, 2);
+    if (!pp->ok) {
+        return 0;
+    }
+
+    uint16_t x = 0;
+
+    if (pp->bigendian) {
+        x |= *pp->current++ << 8;
+        x |= *pp->current++;
+    } else {
+        x |= *pp->current++;
+        x |= *pp->current++ << 8;
+    }
+    return x;
+}
+
+uint32_t pp_u32(PayloadParser *pp)
+{
+    pp_check_capacity(pp, 4);
+    if (!pp->ok) {
+        return 0;
+    }
+
+    uint32_t x = 0;
+
+    if (pp->bigendian) {
+        x |= (uint32_t) (*pp->current++ << 24);
+        x |= (uint32_t) (*pp->current++ << 16);
+        x |= (uint32_t) (*pp->current++ << 8);
+        x |= *pp->current++;
+    } else {
+        x |= *pp->current++;
+        x |= (uint32_t) (*pp->current++ << 8);
+        x |= (uint32_t) (*pp->current++ << 16);
+        x |= (uint32_t) (*pp->current++ << 24);
+    }
+    return x;
+}
+
+const uint8_t *pp_tail(PayloadParser *pp, uint32_t *length)
+{
+    int32_t len = (int) (pp->end - pp->current);
+    if (!pp->ok || len <= 0) {
+        if (length != NULL) {
+            *length = 0;
+        }
+        return NULL;
+    }
+
+    if (length != NULL) {
+        *length = (uint32_t) len;
+    }
+
+    return pp->current;
+}
+
+/** Read a zstring */
+uint32_t pp_string(PayloadParser *pp, char *buffer, uint32_t maxlen)
+{
+    pp_check_capacity(pp, 1);
+    uint32_t len = 0;
+    while (len < maxlen - 1 && pp->current != pp->end) {
+        char c = *buffer++ = (char) *pp->current++;
+        if (c == 0) {
+            break;
+        }
+        len++;
+    }
+    *buffer = 0;
+    return len;
+}
+
+/** Read a buffer */
+uint32_t pp_buf(PayloadParser *pp, uint8_t *buffer, uint32_t maxlen)
+{
+    uint32_t len = 0;
+    while (len < maxlen && pp->current != pp->end) {
+        *buffer++ = *pp->current++;
+        len++;
+    }
+    return len;
+}
--- a/components/ping/CMakeLists.txt
+++ b/components/ping/CMakeLists.txt
@ -0,0 +1,4 @@
+set(COMPONENT_ADD_INCLUDEDIRS include)
+set(COMPONENT_SRCS "src/ping.c")
+
+register_component()
--- a/components/ping/README.txt
+++ b/components/ping/README.txt
@ -0,0 +1 @@
+ICMP ping implementation for connectivity testing
--- a/components/ping/component.mk
+++ b/components/ping/component.mk
@ -0,0 +1,3 @@
+
+COMPONENT_SRCDIRS := src
+COMPONENT_ADD_INCLUDEDIRS := include
--- a/components/ping/include/ping.h
+++ b/components/ping/include/ping.h
@ -0,0 +1,58 @@
+/**
+ * Ping library, used to test connectivity
+ */
+
+#ifndef _PING_H
+#define _PING_H
+
+#include "lwip/ip.h"
+#include "sdkconfig.h"
+
+typedef void (*ping_success_print_cb_t)(int bytes, const char *ip, int seq, int elapsed_ms);
+typedef void (*ping_fail_print_cb_t)(int seq);
+
+/** Ping options */
+typedef struct {
+    ip4_addr_t ip_addr;    // dest IP addr
+    uint16_t count;        // number of requests to send
+    uint16_t interval_ms;  // delay between requests
+    uint16_t payload_size; // extra payload size
+    uint16_t timeout_ms;   // ping timeout in ms
+    ping_success_print_cb_t success_cb;
+    ping_fail_print_cb_t fail_cb;
+} ping_opts_t;
+
+/** Ping response struct */
+typedef struct {
+    int sockfd;           // fd of the used socket, may be closed externally to abort the operation
+    uint16_t sent;        // number of sent echo requests
+    uint16_t received;    // number of received responses
+    uint16_t min_time_ms; // shortest ping
+    uint16_t max_time_ms; // longest ping
+    float loss_pt;        // loss ratio in percent
+} ping_result_t;
+
+/** init all except the ip addr */
+#define PING_CONFIG_DEFAULT() { \
+    .count = 5, \
+    .interval_ms = 1000, \
+    .payload_size = 32, \
+    .timeout_ms = 1000,         \
+    .success_cb = NULL,         \
+    .fail_cb = NULL, \
+}
+
+/**
+ * Send a ping request to a remote server.
+ * Parameters, including the IPv4 address, are specified in the config struct.
+ *
+ * Ping is blocking. The operation may be interrupted by closing the socket from another task,
+ * its FD is exposed from the beginning in result->sockfd.
+ *
+ * @param opts
+ * @param result - response struct, required, for storing statistics
+ * @return success or error
+ */
+esp_err_t ping(const ping_opts_t *opts, ping_result_t *result);
+
+#endif //_PING_H
--- a/components/ping/src/ping.c
+++ b/components/ping/src/ping.c
@ -0,0 +1,262 @@
+// based on https://github.com/pbecchi/ESP32_ping/blob/master/Ping.cpp
+
+#include <string.h>
+
+#include "ping.h"
+
+#include "esp_log.h"
+
+#include "lwip/inet_chksum.h"
+#include "lwip/ip.h"
+#include "lwip/ip4.h"
+#include "lwip/err.h"
+#include "lwip/icmp.h"
+#include "lwip/sockets.h"
+#include "lwip/sys.h"
+#include "lwip/netdb.h"
+#include "lwip/dns.h"
+
+static const char *TAG = "ping";
+
+typedef struct {
+    ping_opts_t config;
+
+    int sockfd;
+    uint16_t ping_seq_num; // sequence number for the next packet
+    uint16_t transmitted;  // sent requests
+    uint16_t received;     // received responses
+    uint16_t min_time_ms;
+    uint16_t max_time_ms;
+    uint16_t last_delay_ms;
+} ping_session_t;
+
+#define PING_ID 0xABCD
+
+static void ping_prepare_echo(ping_session_t *session, struct icmp_echo_hdr *echohdr)
+{
+    const size_t hdr_len = sizeof(struct icmp_echo_hdr);
+    const size_t payload_len = session->config.payload_size;
+
+    ICMPH_TYPE_SET(echohdr, ICMP_ECHO); // compatibility alias
+    ICMPH_CODE_SET(echohdr, 0);
+    echohdr->chksum = 0;
+    echohdr->id = PING_ID;
+    echohdr->seqno = htons(++session->ping_seq_num);
+
+    // the packet is longer than the header, it was malloc'd with extra space
+    // at the end for the payload
+
+    /* fill the rest of the buffer with dummy data */
+    for (size_t i = 0; i < payload_len; i++) {
+        ((char *) echohdr)[hdr_len + i] = (char) (' ' + i);
+    }
+
+    echohdr->chksum = inet_chksum(echohdr, (u16_t) (payload_len + hdr_len));
+}
+
+static err_t ping_send(ping_session_t *session)
+{
+    struct icmp_echo_hdr *echohdr; // we allocate a larger buffer to also fit a payload at the end
+    struct sockaddr_in addr_to;
+    const size_t packet_size = sizeof(struct icmp_echo_hdr) + session->config.payload_size;
+
+    ESP_LOGD(TAG, "Send ICMP ECHO req to %s", ip4addr_ntoa(&session->config.ip_addr));
+
+    echohdr = (struct icmp_echo_hdr *) mem_malloc((mem_size_t) packet_size);
+    if (!echohdr) {
+        return ERR_MEM;
+    }
+
+    ping_prepare_echo(session, echohdr);
+
+    addr_to.sin_len = sizeof(addr_to);
+    addr_to.sin_family = AF_INET;
+    addr_to.sin_addr.s_addr = session->config.ip_addr.addr; // ?
+
+    int ret = sendto(session->sockfd, echohdr, packet_size, 0, (struct sockaddr *) &addr_to, sizeof(addr_to));
+    if (ret <= 0) {
+        ESP_LOGE(TAG, "ping sendto err %d", ret);
+    }
+    else {
+        session->transmitted++;
+    }
+
+    free(echohdr);
+    return (ret > 0 ? ERR_OK : ERR_VAL);
+}
+
+static void ping_recv(ping_session_t *session)
+{
+    char rxbuf[64];
+    int len;
+    struct sockaddr_in addr_from;
+    struct ip_hdr *iphdr;
+    struct icmp_echo_hdr *echohdr = NULL;
+    struct timeval begin, end;
+    uint64_t micros_begin, micros_end, elapsed_ms;
+
+    socklen_t fromlen = sizeof(struct sockaddr_in);
+
+    // Register begin time
+    gettimeofday(&begin, NULL); // FIXME this will fail if they are in different days
+
+    // Receive a response limit size to recv buffer - leftovers will be collected and discarded
+    while (0 < (len = recvfrom(session->sockfd, rxbuf, sizeof(rxbuf), 0, (struct sockaddr *) &addr_from, &fromlen))) {
+        if (len >= (int) (sizeof(struct ip_hdr) + sizeof(struct icmp_echo_hdr))) {
+            // Register end time
+            gettimeofday(&end, NULL);
+
+            /// Get from IP address
+            ip4_addr_t fromaddr;
+            fromaddr.addr = addr_from.sin_addr.s_addr; // ???
+
+            // Get echo
+            iphdr = (struct ip_hdr *) rxbuf;
+            echohdr = (struct icmp_echo_hdr *) (rxbuf + (IPH_HL(iphdr) * 4));
+
+            // Print ....
+            if ((echohdr->id == PING_ID) && (echohdr->seqno == htons(session->ping_seq_num))) {
+                session->received++;
+
+                // Get elapsed time in milliseconds
+                micros_begin = (uint64_t) begin.tv_sec * 1000000;
+                micros_begin += begin.tv_usec;
+
+                micros_end = (uint64_t) end.tv_sec * 1000000;
+                micros_end += end.tv_usec;
+
+                elapsed_ms = (micros_end - micros_begin) / 1000;
+
+                session->last_delay_ms = (uint16_t) elapsed_ms;
+
+                // Update statistics
+                if (elapsed_ms < session->min_time_ms) {
+                    session->min_time_ms = (uint16_t) elapsed_ms;
+                }
+
+                if (elapsed_ms > session->max_time_ms) {
+                    session->max_time_ms = (uint16_t) elapsed_ms;
+                }
+
+                // Print ...
+
+                int seq = ntohs(echohdr->seqno);
+                const char *ipa = ip4addr_ntoa(&fromaddr);
+
+                ESP_LOGD(TAG, "Rx %d bytes from %s: icmp_seq=%d time=%d ms", len, ipa, seq, (int) elapsed_ms);
+
+                if (session->config.success_cb) {
+                    session->config.success_cb(len, ipa, seq, (int) elapsed_ms);
+                }
+
+                return;
+            }
+            else {
+                // junk, ignore
+                ESP_LOGD(TAG, "Rx %d bytes from %s: junk", len, ip4addr_ntoa(&fromaddr));
+            }
+        }
+    }
+
+    session->last_delay_ms = 0;
+
+    if (len < 0) {
+        if (session->config.fail_cb) {
+            session->config.fail_cb(session->ping_seq_num);
+        }
+
+        ESP_LOGW(TAG, "Request timeout for icmp_seq %d", session->ping_seq_num);
+    }
+}
+
+esp_err_t ping(const ping_opts_t *opts, ping_result_t *result)
+{
+    ping_session_t session = {
+        .min_time_ms = UINT16_MAX,
+    };
+
+    if (opts == NULL) {
+        ESP_LOGE(TAG, "opts arg is null");
+        return ESP_ERR_INVALID_ARG;
+    }
+
+    if (result == NULL) {
+        ESP_LOGE(TAG, "result arg is null");
+        return ESP_ERR_INVALID_ARG;
+    }
+
+    if (opts->count == 0) {
+        ESP_LOGE(TAG, "ping count must be > 0");
+    }
+
+    memcpy(&session.config, opts, sizeof(ping_opts_t));
+    memset(result, 0, sizeof(ping_result_t));
+
+    // Create socket
+    if ((session.sockfd = socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0) {
+        ESP_LOGE(TAG, "fail to open socket for ping");
+        return ESP_FAIL;
+    }
+
+    result->sockfd = session.sockfd;
+
+    // Setup socket
+    struct timeval tout;
+    tout.tv_sec = opts->timeout_ms / 1000;
+    tout.tv_usec = (opts->timeout_ms % 1000) * 1000;
+
+    if (setsockopt(session.sockfd, SOL_SOCKET, SO_RCVTIMEO, &tout, sizeof(tout)) < 0) {
+        closesocket(session.sockfd);
+        session.sockfd = -1;
+        result->sockfd = -1;
+        ESP_LOGE(TAG, "fail to set ping socket rx timeout");
+        return ESP_FAIL;
+    }
+
+    if (setsockopt(session.sockfd, SOL_SOCKET, SO_SNDTIMEO, &tout, sizeof(tout)) < 0) {
+        closesocket(session.sockfd);
+        session.sockfd = -1;
+        result->sockfd = -1;
+        ESP_LOGE(TAG, "fail to set ping socket tx timeout");
+        return ESP_FAIL;
+    }
+
+    ESP_LOGD(TAG, "Pinging %s: %d data bytes", ip4addr_ntoa(&opts->ip_addr), opts->payload_size);
+
+    while (session.ping_seq_num < opts->count) {
+        if (ping_send(&session) == ERR_OK) {
+            ping_recv(&session);
+        }
+        if (session.ping_seq_num < opts->count) {
+            // subtract the wait time from the requested wait interval
+            int wait_time = opts->interval_ms - session.last_delay_ms;
+            if (wait_time >= 0) { // if 0, just yields
+                vTaskDelay(wait_time / portTICK_PERIOD_MS);
+            }
+        }
+    }
+
+    if (session.sockfd > 0) {
+        closesocket(session.sockfd);
+        session.sockfd = -1;
+        result->sockfd = -1;
+    }
+
+    result->sent = session.transmitted;
+    result->received = session.received;
+    result->min_time_ms = session.min_time_ms;
+    result->max_time_ms = session.max_time_ms;
+    result->loss_pt = (float) ((
+                                   ((float) session.transmitted - (float) session.received)
+                                   / (float) session.transmitted
+                               ) * 100.0);
+
+    ESP_LOGD(TAG, "%d tx, %d rx, %.1f%% loss, latency min %d ms, max %d ms",
+             result->sent,
+             result->received,
+             result->loss_pt,
+             result->min_time_ms,
+             result->max_time_ms);
+
+    return ESP_OK;
+}
--- a/components/socket_server/CMakeLists.txt
+++ b/components/socket_server/CMakeLists.txt
@ -0,0 +1,4 @@
+set(COMPONENT_ADD_INCLUDEDIRS include)
+set(COMPONENT_SRCS "src/socket_server.c")
+
+register_component()
--- a/components/socket_server/README.txt
+++ b/components/socket_server/README.txt
@ -0,0 +1 @@
+Generic TCP socket server that can be used e.g. for telnet
--- a/components/socket_server/component.mk
+++ b/components/socket_server/component.mk
@ -0,0 +1,3 @@
+
+COMPONENT_SRCDIRS := src
+COMPONENT_ADD_INCLUDEDIRS := include
--- a/components/socket_server/include/socket_server.h
+++ b/components/socket_server/include/socket_server.h
@ -0,0 +1,282 @@
+/**
+ * Generic implementation of a TCP socket server.
+ */
+
+#ifndef _SOCKET_SERVER_H_
+#define _SOCKET_SERVER_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#ifndef ESP_PLATFORM
+#define ESP_OK          0       /*!< esp_err_t value indicating success (no error) */
+#define ESP_FAIL        (-1)      /*!< Generic esp_err_t code indicating failure */
+#define ESP_ERR_NO_MEM              0x101   /*!< Out of memory */
+#define ESP_ERR_INVALID_ARG         0x102   /*!< Invalid argument */
+#define ESP_ERR_INVALID_STATE       0x103   /*!< Invalid state */
+#define ESP_ERR_INVALID_SIZE        0x104   /*!< Invalid size */
+#define ESP_ERR_NOT_FOUND           0x105   /*!< Requested resource not found */
+#define ESP_ERR_NOT_SUPPORTED       0x106   /*!< Operation or feature not supported */
+#define ESP_ERR_TIMEOUT             0x107   /*!< Operation timed out */
+#else
+#include <esp_err.h>
+#include "sdkconfig.h"
+#endif
+
+typedef struct sockd_server *Tcpd_t;
+typedef struct sockd_client *TcpdClient_t;
+typedef int tcpd_err_t;
+
+#define FD_NONE (-1)
+
+/**
+ * Socket read handler
+ */
+typedef tcpd_err_t (*tcpd_read_fn_t)(Tcpd_t serv, TcpdClient_t client, int sockfd);
+
+/**
+ * Socket open handler
+ */
+typedef tcpd_err_t (*tcpd_open_fn_t)(Tcpd_t serv, TcpdClient_t client);
+
+/**
+ * Socket close handler
+ */
+typedef tcpd_err_t (*tcpd_close_fn_t)(Tcpd_t serv, TcpdClient_t client);
+
+/**
+ * Function called during server shutdown to free the server context
+ */
+typedef void (*sockd_sctx_free_fn_t)(void * sctx);
+
+/**
+ * Server config structure
+ */
+typedef struct tcpd_config {
+    uint16_t port;          //!< Server port
+    uint16_t max_clients;   //!< Max number of connected clients
+    bool close_lru;         //!< Close the least recently used client when a new connection is received
+    bool start_immediately; //!< If true, start the server immediately after init, otherwise it starts paused
+
+    void *sctx;                         //!< Server context (arbitrary user data accessible from the callbacks)
+    sockd_sctx_free_fn_t sctx_free_fn;  //!< Context freeing function (no-op if NULL)
+
+    tcpd_read_fn_t  read_fn;    //!< Callback to read data from a socket.
+    tcpd_open_fn_t  open_fn;    //!< Callback to init a new client connection. Can set the client tag or handle.
+    tcpd_close_fn_t close_fn;   //!< Callback when a client left or is kicked. Can free the client context.
+
+    const char *task_name;  //!< Server task name
+    uint32_t task_stack;    //!< Server stack size
+    uint8_t task_prio;      //!< Server priority
+} tcpd_config_t;
+
+#define TCPD_INIT_DEFAULT() \
+{                               \
+    .port = 23,                 \
+    .max_clients = 1,           \
+    .close_lru = true,          \
+    .start_immediately = true,  \
+                                \
+    .sctx = NULL,               \
+    .sctx_free_fn = NULL,       \
+                                \
+    .read_fn = NULL,            \
+    .open_fn = NULL,            \
+    .close_fn = NULL,           \
+                                \
+    .task_name = "socksrv",     \
+    .task_stack = 2048,         \
+    .task_prio = 3,             \
+}
+
+struct tcpd_client_iter {
+    Tcpd_t server;
+    uint16_t next;
+};
+
+/** Initializer for the client iterator */
+tcpd_err_t tcpd_iter_init(struct tcpd_client_iter *iter, Tcpd_t serv);
+
+/** Iterate active clients. Returns NULL if no more clients were found. */
+TcpdClient_t tcpd_client_iter_next(struct tcpd_client_iter *iterator);
+
+/**
+ * Get server context. The context was defined in the config object.
+ *
+ * @param serv - server handle
+ * @return server context
+ */
+void *tcpd_get_server_ctx(Tcpd_t serv);
+
+/**
+ * Get client context, set by socksrv_set_client_ctx()
+ *
+ * @param client - client handle
+ * @return context object
+ */
+void *tcpd_get_client_ctx(TcpdClient_t client);
+
+/**
+ * Set client context. If allocated, it should be freed by the client close function.
+ *
+ * @param client - client handle
+ * @param cctx - context object
+ */
+void tcpd_set_client_ctx(TcpdClient_t client, void *cctx);
+
+/**
+ * Get client tag.
+ *
+ * @param client - client handle
+ * @return tag value
+ */
+uint32_t tcpd_get_client_tag(TcpdClient_t client);
+
+/**
+ * Set client tag. Tag may be used alongside the client context e.g. to distinguish
+ * context type.
+ *
+ * @param client - client handle
+ * @param tag - tag value
+ */
+void tcpd_set_client_tag(TcpdClient_t client, uint32_t tag);
+
+/**
+ * Get client IP address
+ *
+ * @param client - client
+ * @return address struct or NULL
+ */
+const struct sockaddr_in * tcpd_get_client_addr(TcpdClient_t client);
+
+/**
+ * Get client FD
+ *
+ * @param client
+ * @return fd
+ */
+int tcpd_get_client_fd(TcpdClient_t client);
+
+/**
+ * Kick a single client.
+ * This may be called even when the server is stopped.
+ *
+ * The client handle should be considered invalid after this call,
+ * as it may be reused for another incoming connection.
+ * Set it to NULL for safety.
+ *
+ * @param client - client handle (obtained e.g. as an argument in the receive function)
+ */
+void tcpd_kick(TcpdClient_t client);
+
+/**
+ * Kick all connected clients.
+ * This may be called even when the server is stopped.
+ *
+ * @param serv - server handle
+ */
+void tcpd_kick_all(Tcpd_t serv, bool with_injected);
+
+/* Kick clients with tag. Returns kicked count, or -1 on err */
+int tcpd_kick_by_tag(Tcpd_t serv, uint32_t tag);
+
+/** Kick clients with a given IP. Returns kicked count, or -1 on err */
+int tcpd_kick_by_ip(Tcpd_t serv, const struct in_addr *addr);
+
+/**
+ * Inject a client with a custom FD (e.g. STDIN, other UART socket...).
+ *
+ * Injecting STDIN will automatically use STDOUT for outgoing messages.
+ *
+ * @param server
+ * @param fd
+ * @return the client, NULL on failure
+ */
+TcpdClient_t tcpd_inject_client(Tcpd_t server, int fd);
+
+/**
+ * Initialize and start the socket server.
+ *
+ * @param config - config struct (will be copied into the server handle, can be only on stack)
+ * @param handle - pointer where to store the server handle.
+ * @return success
+ */
+tcpd_err_t tcpd_init(const tcpd_config_t *config, Tcpd_t *handle);
+
+/**
+ * Shutdown the server, close open sockets and free all allocated memory.
+ * Client contexts can be freed in the close_fn, if it was defined in server config.
+ * It will be called for all still open sockets.
+ *
+ * The server context will be freed using the user-provided free function (set in config)
+ *
+ * The server handle should be considered invalid after calling this function.
+ * The same applies to all existing client handles. Set it to NULL for safety.
+ *
+ * @param serv - server handle
+ */
+void tcpd_shutdown(Tcpd_t serv);
+
+/**
+ * Stop the server loop. It won't accept any connection requests nor data.
+ * A stopped server can be resumed again.
+ *
+ * Does nothing if the server is already stopped.
+ *
+ * @param serv - server handle
+ */
+void tcpd_suspend(Tcpd_t serv);
+
+/**
+ * Start the server after it has been stopped.
+ *
+ * Does nothing if the server is already running.
+ *
+ * The server runs immediately after init,
+ * so this does not need to be called to start it.
+ *
+ * @param serv - server handle
+ */
+void tcpd_resume(Tcpd_t serv);
+
+/**
+ * Send data to all connected clients
+ *
+ * @param serv - server handle
+ * @param buffer - data to send
+ * @param len - data length; if negative, treat data as a string and use strlen()
+ */
+tcpd_err_t tcpd_broadcast(Tcpd_t serv, const uint8_t *data, ssize_t len);
+
+/**
+ * Send a message to a single client
+ *
+ * @param client - client handle
+ * @param data - bytes to send
+ * @param len - length or -1 for strlen
+ * @return success
+ */
+tcpd_err_t tcpd_send(TcpdClient_t client, const uint8_t *data, ssize_t len);
+
+/**
+ * Get client slot by FD. Returns NULL if not found.
+ *
+ * @param serv - server struct
+ * @param sockfd
+ * @return
+ */
+TcpdClient_t tcpd_client_by_fd(Tcpd_t serv, int sockfd);
+
+/**
+ * Get client by tag. Returns NULL if not found.
+ *
+ * @param serv - server struct
+ * @param sockfd
+ * @return
+ */
+TcpdClient_t tcpd_client_by_tag(Tcpd_t serv, uint32_t tag);
+
+#endif //_SOCKET_SERVER_H_
--- a/components/socket_server/src/socket_server.c
+++ b/components/socket_server/src/socket_server.c
--- a/components/vconsole/CMakeLists.txt
+++ b/components/vconsole/CMakeLists.txt
@ -0,0 +1,18 @@
+idf_component_register(
+        INCLUDE_DIRS "libconsole/include"
+)
+
+set(CONSOLE_FILE_SUPPORT OFF)
+set(CONSOLE_USE_FILE_IO_STREAMS OFF)
+set(CONSOLE_USE_TERMIOS OFF)
+set(CONSOLE_USE_MEMSTREAM OFF)
+set(CONSOLE_MAX_NUM_ARGS 16)
+set(CONSOLE_LINE_BUF_LEN 128)
+set(CONSOLE_PROMPT_MAX_LEN 24)
+set(CONSOLE_HISTORY_LEN 8)
+set(CONSOLE_HAVE_CSP OFF)
+set(CONSOLE_USE_CSP_COMMANDS OFF)
+
+add_subdirectory(libconsole)
+
+target_link_libraries(${COMPONENT_LIB} INTERFACE console argtable3)
--- a/components/vconsole/libconsole/.gitignore
+++ b/components/vconsole/libconsole/.gitignore
@ -0,0 +1,54 @@
+build
+*.swp
+.lock*
+.waf*
+.waf3*
+waf-*/
+*.o
+*.d
+*.pyc
+.project
+.cproject
+~*
+pdebug*
+*.tar*
+tags
+.DS_store
+
+# ninja files
+build.ninja
+rules.ninja
+.ninja_deps
+.ninja_log
+
+# generated by cmake
+CMakeCache.txt
+*.cmake
+CMakeFiles
+vcom
+Makefile
+*.cbp
+*.a
+
+.idea/
+.DS_Store
+
+# Visual Studio clutter
+_ReSharper*
+*.sdf
+*.suo
+*.dir
+*.vcxproj*
+*.sln
+.vs
+CMakeSettings.json
+Win32
+x64
+Debug
+Release
+MinSizeRel
+RelWithDebInfo
+*.opensdf
+
+# this is generated when using in-tree make build
+include/console/config.h
--- a/components/vconsole/libconsole/CMakeLists.txt
+++ b/components/vconsole/libconsole/CMakeLists.txt
@ -0,0 +1,73 @@
+cmake_minimum_required(VERSION 3.13)
+project(lib-console)
+
+add_subdirectory("lib/argtable3")
+
+file(GLOB CONSOLE_SOURCES "src/*.c")
+
+# Console config options
+
+# Line buffer length
+set(CONSOLE_LINE_BUF_LEN "255" CACHE STRING "Line buffer length (max command size)")
+
+# Max number of CLI args
+set(CONSOLE_MAX_NUM_ARGS "64" CACHE STRING "Max number of arguments for a command")
+
+# Prompt buffer length
+set(CONSOLE_PROMPT_MAX_LEN "32" CACHE STRING "Max prompt string length")
+
+# CLI history length
+set(CONSOLE_HISTORY_LEN "32" CACHE STRING "Console history length")
+
+option(CONSOLE_FILE_SUPPORT "Support filesystem operations (history save/load)" ON)
+
+option(CONSOLE_USE_FILE_IO_STREAMS "Use FILE* based console I/O" ON)
+option(CONSOLE_USE_TERMIOS "Use unistd/termios to set nonblocking mode & implement bytes available check" ON)
+option(CONSOLE_USE_MEMSTREAM "Allow using open_memstream() to generate command hints and report argtable errors" ON)
+
+if(CONSOLE_USE_TERMIOS AND NOT CONSOLE_USE_FILE_IO_STREAMS)
+    message( FATAL_ERROR "Can't use TERMIOS without FILE_IO_STREAMS" )
+endif()
+
+option(CONSOLE_USE_FREERTOS "Use FreeRTOS" ON)
+option(CONSOLE_USE_PTHREADS "Use pthreads" OFF)
+
+# Default timeout for CSP commands
+set(CONSOLE_CSP_DEF_TIMEOUT_MS "3000" CACHE STRING "Default timeout for CSP commands (milliseconds)")
+
+option(CONSOLE_TESTING_ALLOC_FUNCS "Test the internal console_malloc etc. functions on startup (with asserts)" OFF)
+
+configure_file(
+        "include/console/config.h.in"
+        "include/console/config.h"
+)
+
+add_library(console ${CONSOLE_SOURCES})
+
+# Enable extra warnings
+#set_target_properties(console PROPERTIES COMPILE_FLAGS "-Wall -Wextra" )
+
+target_include_directories(console
+        PUBLIC "include" "${CMAKE_CURRENT_BINARY_DIR}/include" # this is where the generated config header is placed
+        PRIVATE "src"
+)
+
+# Link libraries
+set(LIBRARIES argtable3)
+
+if(ESP_PLATFORM)
+    set(CONSOLE_USE_FREERTOS ON)
+    set(CONSOLE_USE_PTHREADS OFF)
+    # special hack for ESP-IDF is needed to allow implementing extern prototypes in main
+    set(LIBRARIES ${LIBRARIES} idf::main)
+endif()
+
+if(NOT CONSOLE_USE_FREERTOS AND NOT CONSOLE_USE_PTHREADS)
+    message( FATAL_ERROR "Required either FreeRTOS or PTHREADS!" )
+endif()
+
+if(CONSOLE_USE_PTHREADS)
+    set(LIBRARIES ${LIBRARIES} pthread)
+endif()
+
+target_link_libraries(console ${LIBRARIES})
--- a/components/vconsole/libconsole/LICENSE.txt
+++ b/components/vconsole/libconsole/LICENSE.txt
@ -0,0 +1 @@
+Proprietary code (c) VZLU 2019-2020
--- a/components/vconsole/libconsole/include/console/cmddef.h
+++ b/components/vconsole/libconsole/include/console/cmddef.h
@ -0,0 +1,24 @@
+//
+// Header with useful defines and common includes
+// to use when defining console commands.
+//
+// This file aims to concentrate the most common includes
+// and utility macros to make command definitions easier to write.
+//
+// Created by MightyPork on 2020/03/11.
+//
+
+#ifndef LIBCONSOLE_CMDDEF_H
+#define LIBCONSOLE_CMDDEF_H
+
+#include <stdint.h>
+#include <argtable3.h>
+#include "console/console.h"
+
+#if CONSOLE_HAVE_CSP
+#include <csp/csp.h>
+#endif
+
+#include "console/utils.h"
+
+#endif //LIBCONSOLE_CMDDEF_H
--- a/components/vconsole/libconsole/include/console/config.h.in
+++ b/components/vconsole/libconsole/include/console/config.h.in
@ -0,0 +1,22 @@
+/**
+ * Console configuration file, filled by CMake
+ *
+ * Created on 2020/03/16.
+ */
+
+#ifndef LIBCONSOLE_CONFIG_H
+#define LIBCONSOLE_CONFIG_H
+
+#cmakedefine CONSOLE_LINE_BUF_LEN @CONSOLE_LINE_BUF_LEN@
+#cmakedefine CONSOLE_MAX_NUM_ARGS @CONSOLE_MAX_NUM_ARGS@
+#cmakedefine CONSOLE_PROMPT_MAX_LEN @CONSOLE_PROMPT_MAX_LEN@
+#cmakedefine CONSOLE_HISTORY_LEN @CONSOLE_HISTORY_LEN@
+#cmakedefine01 CONSOLE_FILE_SUPPORT
+#cmakedefine01 CONSOLE_USE_FILE_IO_STREAMS
+#cmakedefine01 CONSOLE_USE_TERMIOS
+#cmakedefine01 CONSOLE_USE_MEMSTREAM
+#cmakedefine01 CONSOLE_USE_FREERTOS
+#cmakedefine01 CONSOLE_USE_PTHREADS
+#cmakedefine01 CONSOLE_TESTING_ALLOC_FUNCS
+
+#endif //LIBCONSOLE_CONFIG_H
--- a/components/vconsole/libconsole/include/console/console.h
+++ b/components/vconsole/libconsole/include/console/console.h
@ -0,0 +1,362 @@
+/**
+ * Console - VCOM command engine
+ *
+ * Created on 2020/02/28 by Ondrej Hruska
+ *
+ * Parts are based on the console component from esp-idf
+ * licensed under the Apache 2 license.
+ */
+
+#ifndef LIBCONSOLE_H
+#define LIBCONSOLE_H
+
+#include <stdio.h>
+
+#include <console/config.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef enum {
+  /* Colors */
+  COLOR_RESET     = 0xF0,
+  COLOR_BLACK     = 0x01,
+  COLOR_RED       = 0x02,
+  COLOR_GREEN     = 0x03,
+  COLOR_YELLOW    = 0x04,
+  COLOR_BLUE      = 0x05,
+  COLOR_MAGENTA   = 0x06,
+  COLOR_CYAN      = 0x07,
+  COLOR_WHITE     = 0x08,
+  /* Modifiers */
+  COLOR_NORMAL    = 0x0F,
+  COLOR_BOLD      = 0x10,
+  COLOR_UNDERLINE = 0x20,
+  COLOR_BLINK     = 0x30,
+  COLOR_HIDE      = 0x40,
+} console_color_t;
+
+#if CONSOLE_USE_FREERTOS
+    #include "freertos/FreeRTOS.h"
+    #include "freertos/task.h"
+    #include "freertos/semphr.h"
+
+    typedef SemaphoreHandle_t console_mutex_t;
+#endif
+
+#if CONSOLE_USE_PTHREADS
+  #include <pthread.h>
+    typedef pthread_mutex_t console_mutex_t;
+#endif
+
+#if CONSOLE_USE_TERMIOS
+#include <termios.h>
+#endif
+
+/**
+ * Console config struct
+ */
+struct console_config {
+    /**
+     * Timeout waiting for execution lock when handling a command.
+     * This should be longer than the slowest command in the system.
+     */
+    uint32_t execution_lock_timeout_ms;
+};
+
+/**
+ * Macro to init the console config struct
+ */
+#define CONSOLE_CONFIG_DEFAULTS() { \
+    .execution_lock_timeout_ms = 10000, \
+}
+
+typedef struct console_config console_config_t;
+
+struct console_ctx; // early declaration
+
+/**
+ * Console context
+ */
+typedef struct console_ctx console_ctx_t;
+
+/**
+ * Console errors - return codes
+ */
+enum console_err {
+    CONSOLE_OK = 0,
+    /** unspecified error */
+    CONSOLE_ERROR = 1,
+    /** Allocation failed */
+    CONSOLE_ERR_NO_MEM,
+    /** Function call not allowed (e.g. console not inited) */
+    CONSOLE_ERR_BAD_CALL,
+    /** Argument validation failed */
+    CONSOLE_ERR_INVALID_ARG,
+    /** Command not recognized */
+    CONSOLE_ERR_UNKNOWN_CMD,
+    /** Timeout */
+    CONSOLE_ERR_TIMEOUT,
+    /** IO error (file open fail, etc.) */
+    CONSOLE_ERR_IO,
+    /** Operation denied (not allowed / insufficient rights) */
+    CONSOLE_ERR_NOT_POSSIBLE,
+    /** End marker */
+    _CONSOLE_ERR_MAX,
+};
+
+/**
+ * Print string describing console error.
+ * In case of unknown error, the number is shown.
+ *
+ * The argument should be `enum console_err`, but any number is valid.
+ */
+void console_err_print_ctx(struct console_ctx *ctx, int e);
+
+// TODO error-to-string function
+
+typedef enum console_err console_err_t;
+
+// early decl's
+struct cmd_signature;
+typedef struct cmd_signature cmd_signature_t;
+
+/**
+ * Command signature, passed as the last argument to the command handler
+ * to perform registration.
+ *
+ * \note Fill only fields that differ from default (zeros/NULLs)
+ */
+struct cmd_signature {
+    const char* command;  //!< Command name, used in invocations (filled internally, do not set)
+    const char* help;     //!< Command help text, shown when called with -h
+    const char* hint;     //!< Hint text, generated from argtable if hint==NULL & argtable!=NULL
+    bool no_history;      //!< Command skips history
+    bool custom_args;     //!< Disable argtable parsing in the handler function, will be parsed manually from argv/argc
+
+    /**
+     * Argtable, struct or array that must end with arg_end().
+     * Used by the register function and for disambiguation.
+     */
+    void* argtable;
+};
+
+/**
+ * Active console context pointer, valid only when handling a console command (otherwise NULL).
+ *
+ * Used by the console printf & other IO methods.
+ */
+extern struct console_ctx * console_active_ctx;
+
+/**
+ * Function handling a callback from the console loop.
+ */
+typedef void(*console_callback_t)(console_ctx_t *ctx);
+
+/**
+ * Console context struct
+ */
+struct console_ctx {
+#if CONSOLE_USE_FILE_IO_STREAMS
+    // Streams
+    FILE* in;  //!< stdin fd, can be -1 if not available (running commands in non-interactive mode)
+    FILE* out; //!< stdout fd
+
+#if CONSOLE_USE_TERMIOS
+    // original termios is stored here before entering raw mode
+    struct termios orig_termios;
+#endif
+
+#else
+    void *ioctx;
+#endif //CONSOLE_USE_FILE_IO_STREAMS
+
+#if CONSOLE_FILE_SUPPORT
+    char *history_file;
+#endif //CONSOLE_FILE_SUPPORT
+
+    bool __internal_heap_allocated;
+    bool exit_allowed;
+
+    char prompt[CONSOLE_PROMPT_MAX_LEN]; //!< Prompt, can be modified by a command or `before_readline_fn`
+    char line_buffer[CONSOLE_LINE_BUF_LEN];
+
+    /**
+     * Callback fired in the command evaluation loop, each time before the prompt is shown and new line read.
+     * This command can print to the output streams, change prompt, shutdown console, etc.
+     */
+    console_callback_t loop_handler;
+
+    /**
+     * Callback fired before the console task shuts down
+     */
+    console_callback_t shutdown_handler;
+
+    /**
+     * Shutdown requested. Console will exit as soon as possible.
+     */
+    bool exit_requested;
+
+    /**
+     * Interactive mode. Enables additional outputs for user convenience.
+     */
+    bool interactive;
+
+    /**
+     * Enable ANSI colors
+     */
+    bool use_colors;
+
+    /* These fields are valid only during command execution */
+    const char **argv; //!< The current argv
+    size_t argc;       //!< The current argc
+    const cmd_signature_t *cmd; //!< Pointer to the currently executed command signature
+
+    /** Used for argument validation */
+    uint32_t __internal_magic;
+};
+
+#define CONSOLE_CTX_MAGIC 0x6f587468
+
+/**
+ * Command handler type.
+ *
+ * @param ctx - console context, including input/output files
+ * @param reg - signature struct; if not NULL, init the static argtable, fill this struct, and return OK (0).
+ * @return status code, 0 = OK (use cons_err_t constants if possible)
+ */
+typedef int (*console_command_t)(console_ctx_t *ctx, struct cmd_signature *reg);
+
+/**
+ * Intialize the console
+ *
+ * @param config - config pointer, NULL to use defaults
+ * @return status code
+ */
+console_err_t console_init(const console_config_t *config);
+
+/**
+ * @brief Register console command
+ *
+ * If the command function is already registered, this creates an alias.
+ * A multi-word command automatically create a command group. The group can
+ * be described using a description string by calling `console_group_add()`
+ * - at convenience before or after the commands are registered.
+ *
+ * @param name - command name (may contain spaces for "multi-part commands")
+ * @param handler pointer to the command handler.
+ * @return status code
+ */
+console_err_t console_cmd_register(console_command_t handler, const char *name);
+
+/**
+ * @brief Register a command group.
+ *
+ * Command groups are created automatically when used.
+ * This method can create a group with description, or attach a custom description
+ * to an existing group.
+ *
+ * @param name - group name (first word of multi-part commands)
+ * @param descr - description to attach, can be NULL
+ * @return staus code
+ */
+console_err_t console_group_add(const char *name, const char *descr);
+
+/**
+ * Add alias to an existing command by name.
+ *
+ * @param original - original command name
+ * @param alias - command's alias
+ * @return status code
+ */
+console_err_t console_cmd_add_alias(const char *original, const char *alias);
+
+/**
+ * Add alias by handler function
+ *
+ * @param handler - command handler
+ * @param alias - new name
+ * @return status code
+ */
+console_err_t console_cmd_add_alias_fn(console_command_t handler, const char *alias);
+
+/**
+ * Internal error print function. Has WEAK linkage, can be overridden.
+ *
+ * This function is used to report detected bugs and should not be called
+ * in well-written "production code".
+ *
+ * @param msg - error message
+ */
+void console_internal_error_print(const char *msg);
+
+/**
+ * This function is guarded by a mutex and will wait for the execution lock as
+ * configured in console_config.
+ *
+ * @brief Run command line
+ * @param[in] outf
+ * @param[in]  inf
+ * @param cmdline command line (command name followed by a number of arguments)
+ * @param[out] pRetval return code from the command (set if command was run)
+ * @param[out] pCommandSig - is set to a pointer to the matched command signature, or NULL on error
+ * @return status code
+ */
+console_err_t console_handle_cmd(
+    console_ctx_t *ctx,
+    const char *cmdline,
+    int *pRetval,
+    const struct cmd_signature **pCommandSig
+);
+
+/**
+ * Count all registered commands
+ *
+ * @return
+ */
+size_t console_count_commands(void);
+
+/**
+ * Create a console IO context and init it to defaults.
+ *
+ * takes stdin and stdout file descriptors, or IO context (based on config flags)
+ *
+ * In the FD variant, pass NULL as STDIN if not available.
+ *
+ * @param ctx - context, if using static alloc, NULL to allocate internally.
+ * @return the context, NULL if alloc or init fails
+ */
+console_ctx_t *console_ctx_init(
+    console_ctx_t *ctx,
+#if CONSOLE_USE_FILE_IO_STREAMS
+    FILE* inf, FILE* outf
+#else
+    void * ioctx
+#endif
+);
+
+/**
+ * Destroy a console IO context.
+ *
+ * Make sure to release any user fields (ioctx, for example) beforehand.
+ *
+ * @attention ONLY CALL THIS IF THE CONTEXT WAS DYNAMICALLY ALLOCATED!
+ *
+ * @param[in,out] ctx - pointer to context, will be set to NULL.
+ */
+void console_ctx_destroy(console_ctx_t *ctx);
+
+/**
+ * Console task
+ *
+ * @param[in] param - must be a valid console context (see `console_ctx_init()`)
+ */
+void console_task(void *param);
+
+/**
+ * Variant of 'console_task' for pthreads (returns NULL)
+ */
+void* console_task_posix(void *param);
+
+#include "console_io.h"
+
+#endif //LIBCONSOLE_H
--- a/components/vconsole/libconsole/include/console/console_io.h
+++ b/components/vconsole/libconsole/include/console/console_io.h
@ -0,0 +1,196 @@
+/**
+ * Console IO functions.
+ *
+ * This header is included internally by console.h
+ *
+ * Created on 2020/04/09.
+ */
+
+#ifndef LIBCONSOLE_IO_H
+#define LIBCONSOLE_IO_H
+
+#ifndef LIBCONSOLE_H
+#error Include console.h!
+#endif
+
+#include <stdarg.h>
+
+// ------ If the FILE based IO streams option is OFF, these are extern -------
+
+/**
+ * Write to console context.
+ *
+ * In command context, the more convenient "vconsole_write", "console_print", "console_println"
+ * and "console_printf" functions can be used instead.
+ *
+ * This function is a Linenoise write callback.
+ *
+ * Return number of characters written, -1 on error.
+ */
+extern int console_write_ctx(console_ctx_t *ctx, const char *text, size_t len);
+
+/**
+ * Read from console context's input stream.
+ *
+ * In command context, the more convenient "vconsole_read" function and the
+ * "console_can_read" and "console_have_stdin" helper functions can be used instead.
+ *
+ * This is also a Linenoise read callback.
+ *
+ * Return number of characters read, -1 on error
+ */
+extern int console_read_ctx(console_ctx_t *ctx, char *dest, size_t count);
+
+/**
+ * Check if console input stream has bytes ready.
+ *
+ * @return number of queued bytes, 0 if none, -1 on error.
+ */
+extern int console_can_read_ctx(console_ctx_t *ctx);
+
+/**
+ * Test if console context is not NULL and has stdin stream available
+ *
+ * @return have stdin
+ */
+extern bool console_have_stdin_ctx(console_ctx_t *ctx);
+
+
+// ----- end extern interface -----
+
+/**
+ * Print zero-terminated string to to console output
+ *
+ * @param text - characters to write
+ * @return number of characters written, or -1 on error
+ */
+int console_print_ctx(console_ctx_t *ctx, const char *text);
+
+/**
+ * Print zero-terminated string to console output, followed by a newline
+ *
+ * @param text - characters to write
+ * @return number of characters written, or -1 on error
+ */
+ssize_t console_println_ctx(console_ctx_t *ctx, const char *text);
+
+/**
+ * Console printf
+ *
+ * @param ctx - console context
+ * @param color - color to use, COLOR_RESET = default
+ * @param format
+ * @param ...
+ * @return bytes written, or -1 on error
+ */
+ssize_t console_printf_ctx(console_ctx_t *ctx, console_color_t color, const char *format, ...) __attribute__((format(printf,3,4)));
+
+/**
+ * Console vprintf
+ *
+ * @param ctx - console context
+ * @param color - color to use, COLOR_RESET = default
+ * @param format - format string
+ * @param args - varargs passed as a va_list
+ * @return bytes written, or -1 on error
+ */
+ssize_t console_vprintf_ctx(console_ctx_t *ctx, console_color_t color, const char *format, va_list args);
+
+/**
+ * Write to console output
+ *
+ * @attention Can only be used within a console command context
+ *
+ * @param text - characters to write
+ * @param len - text length
+ * @return number of characters written, or -1 on error
+ */
+ssize_t vconsole_write(const char *text, size_t len);
+
+
+// -------------------- Convenience functions -------------------------
+
+/**
+ * Test if we are in the console command context.
+ *
+ * @return in command context
+ */
+static inline bool console_context_available(void) {
+    return console_active_ctx != NULL;
+}
+
+/**
+ * Test if we are in the console command context AND the console context has an input stream
+ * (input stream may be used in interactive commands)
+ *
+ * @return have stdin
+ */
+bool console_have_stdin(void);
+
+/**
+ * Console printf. Defined as a macro to pass variadic arguments
+ *
+ * @attention Can only be used within a console command context
+ *
+ * @param format
+ * @param ...
+ * @return bytes written, or -1 on error
+ */
+#define console_printf(format, ...) console_printf_ctx(console_active_ctx, COLOR_RESET, format, ##__VA_ARGS__)
+
+/**
+ * Console printf with colors. Defined as a macro to pass variadic arguments
+ *
+ * @attention Can only be used within a console command context
+ *
+ * @param color - from console_colors_t enum
+ * @param format
+ * @param ...
+ * @return bytes written, or -1 on error
+ */
+#define console_color_printf(color, format, ...) console_printf_ctx(console_active_ctx, color, format, ##__VA_ARGS__)
+
+/**
+ * Read from console input
+ *
+ * @attention Can only be used within a console command context
+ *
+ * @param dest - destination buffer
+ * @param count - how many characters to read
+ * @return number of characters read, or -1 on error
+ */
+ssize_t vconsole_read(char *dest, size_t count);
+
+/**
+ * Check if console input stream has bytes ready.
+ *
+ * @attention Can only be used within a console command context
+ *
+ * @return number of queued bytes, 0 if none, -1 on error.
+ */
+int console_can_read(void);
+
+/**
+ * Print zero-terminated string to to console output
+ *
+ * @attention Can only be used within a console command context
+ *
+ * @param text - characters to write
+ * @return number of characters written, or -1 on error
+ */
+static inline int console_print(const char *text) {
+    return console_print_ctx(console_active_ctx, text);
+}
+
+/**
+ * Print zero-terminated string to console output, followed by a newline
+ *
+ * @attention Can only be used within a console command context
+ *
+ * @param text - characters to write
+ * @return number of characters written, or -1 on error
+ */
+ssize_t console_println(const char *text);
+
+
+#endif //LIBCONSOLE_IO_H
--- a/components/vconsole/libconsole/include/console/prefix_match.h
+++ b/components/vconsole/libconsole/include/console/prefix_match.h
@ -0,0 +1,94 @@
+/**
+ * Prefix Match
+ *
+ * Match input value to a list of options, allowing non-ambiguous abbreviation and partial matching.
+ * This library was designed for command recognition in interactive consoles and command interfaces.
+ * 
+ * Created on 2020/06/09 by Ondřej Hruška
+ */
+
+#ifndef _PREFIX_MATCH_H
+#define _PREFIX_MATCH_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+/** Use case-sensitive matching */
+#define PREFIXMATCH_CASE_SENSITIVE 1
+/** Forbid abbreviations */
+#define PREFIXMATCH_NOABBREV 2
+/** Allow matching fewer words, if unambiguous */
+#define PREFIXMATCH_MULTI_PARTIAL 4
+
+enum pm_test_result {
+    PM_TEST_NO_MATCH = 0,
+    PM_TEST_MATCH = 1,
+    PM_TEST_MATCH_MULTI_PARTIAL = 2,
+};
+
+/**
+ * Recognize (optionally abbreviated) input
+ *
+ * @param[in] value - tested value
+ * @param[in] options - options to match against
+ * @param[in] flags - matching options (bitmask) - accepts PREFIXMATCH_CASE_SENSITIVE and PREFIXMATCH_NOABBREV
+ * @return index of the matched option, -1 on mismatch or ambiguous match
+ */
+int prefix_match(const char *value, const char **options, int flags);
+
+/**
+ * Recognize input consisting of one or more (optionally abbreviated) words
+ *
+ * @param[in] value - tested value
+ * @param[in] options - options to match against, multi-word options separated by the listed delimiters
+ * @param[in] delims - string with a list of possible delimiters (like for strtok)
+ * @param[in] flags - matching options (bitmask) - accepts all options
+ * @return index of the matched option, -1 on mismatch or ambiguous match
+ */
+int prefix_multipart_match(const char *restrict value, const char **options, const char* restrict delims, int flags);
+
+// useful internal functions exported for possible re-use
+
+/**
+ * Test if two word sentences match, with individual words optionally allowed to be abbreviated.
+ *
+ * @internal
+ * @param[in] tested - tested (optionally abbreviated) sentence
+ * @param[in] full - full sentence
+ * @param[in] delims - list of possible delimiters, same may be used for both sentences
+ * @param[in] flags - matching options (bitmask) - accepts all options
+ * @return 1-match; 0-no match; 2-partial (some words) match, if the PREFIXMATCH_MULTI_PARTIAL flag is set
+ */
+enum pm_test_result prefix_multipart_test(const char *restrict tested, const char* restrict full, const char *restrict delims, int flags);
+
+/**
+ * Count words in a "sentence", delimited by any of the given set of delimiters.
+ *
+ * @internal
+ * @param[in] sentence - one or multi-word string
+ * @param[in] delims - delimiters accepted
+ * @return number of words
+ */
+size_t pm_count_words(const char * restrict sentence, const char * restrict delims);
+
+/**
+ * Measure word length
+ *
+ * @internal
+ * @param[in] word - start of a word that ends with either one of the delimiters, or a null byte.
+ * @param[in] delims - delimiters accepted
+ * @return word length
+ */
+size_t pm_word_len(const char * restrict word, const char * restrict delims);
+
+/**
+ * Skip N words in a sentence.
+ *
+ * @param[in] sentence - one or multi-word string
+ * @param[in] delims - delimiters accepted
+ * @param[in] skip - how many words to skip
+ * @return pointer to the first byte after the last skipped word
+ */
+const char *pm_skip_words(const char * restrict sentence, const char * restrict delims, size_t skip);
+
+#endif //_PREFIX_MATCH_H
--- a/components/vconsole/libconsole/include/console/utils.h
+++ b/components/vconsole/libconsole/include/console/utils.h
@ -0,0 +1,213 @@
+/**
+ * Utilities for console commands
+ * 
+ * Created on 2020/03/11.
+ */
+
+#ifndef LIBCONSOLE_UTILS_H
+#define LIBCONSOLE_UTILS_H
+
+#include <stdio.h>
+#include <console/console.h>
+
+#ifndef STR
+#define STR_HELPER(x) #x
+#define STR(x) STR_HELPER(x)
+#endif
+
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+
+#ifndef MAX
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
+
+#ifndef OBC_FIRMWARE
+#define EXPENDABLE_STRING(x) x
+#define EXPENDABLE_CODE(x) x
+#else
+#define EXPENDABLE_STRING(x) ""
+#define EXPENDABLE_CODE(x) do {} while(0);
+#endif
+
+/**
+ * Read an argument, or return default if it is empty.
+ *
+ * This works for commands arg_int0
+ *
+ * Usage:
+ *
+ * \code
+ * static struct {
+ *     struct arg_int *foo;
+ * } args;
+ *
+ * args.foo = arg_int0(...);
+ *
+ * int foo = GET_ARG_INT0(args.foo, 1234);
+ * \endcode
+ */
+#define GET_ARG_INT0(_arg, _def) ((_arg)->count ? (_arg)->ival[0] : (_def))
+
+/**
+ * Get CSP node ID from an argument table, using own address as default.
+ *
+ * Usage:
+ *
+ * \code
+ * static struct {
+ *     struct arg_int *node;
+ * } args;
+ *
+ * args.node = arg_int0(...);
+ *
+ * int node = GET_ARG_CSPADDR0(args.node);
+ * \endcode
+ */
+#define GET_ARG_CSPADDR0(_arg) GET_ARG_INT0((_arg), csp_get_address())
+
+/**
+ * Shortcut to get a timeout argument's value, using CSP_DEF_TIMEOUT_MS as default.
+ */
+#define GET_ARG_TIMEOUT0(_arg) GET_ARG_INT0((_arg), CONSOLE_CSP_DEF_TIMEOUT_MS)
+
+/**
+ * Define an optional CSP node argument
+ */
+#define arg_cspaddr0() arg_int0(NULL, NULL, "<node>", EXPENDABLE_STRING("node ID"))
+
+/**
+ * Define a mandatory CSP node argument
+ */
+#define arg_cspaddr1() arg_int1(NULL, NULL, "<node>", EXPENDABLE_STRING("node ID"))
+
+/**
+ * Define an optional timeout argument, with `CSP_DEF_TIMEOUT_MS`
+ * shown as default. Use `GET_ARG_TIMEOUT0()` to retrieve its value.
+ */
+#define arg_timeout0() arg_int0("t", "timeout", "<ms>", EXPENDABLE_STRING("timeout in ms (default "STR(CONSOLE_CSP_DEF_TIMEOUT_MS)")"))
+
+/**
+ * Define a timeout argument with a custom value shown as default.
+ * Use `GET_ARG_INT0()` with the matching default to retrieve its value.
+ */
+#define arg_timeout0_def(_def) arg_int0("t", "timeout", "<ms>", EXPENDABLE_STRING("timeout in ms (default "STR(_def)")"))
+
+
+#define EMPTY_CMD_SETUP(_helptext)                \
+    (void)ctx;                                    \
+    static struct {                               \
+        struct arg_end *end;                      \
+    } args;                                       \
+                                                  \
+    if (reg) {                                    \
+        args.end = arg_end(1);                    \
+                                                  \
+        reg->argtable = &args;                    \
+        reg->help = EXPENDABLE_STRING(_helptext); \
+        return 0;                                 \
+    }
+
+/**
+ * Hexdump a buffer
+ *
+ * @param outf - output file
+ * @param data - data to dump
+ * @param len - data size
+ */
+void console_hexdump(const void *data, size_t len);
+
+/**
+ * Decode hexa string to binary
+ *
+ * @param hex - hexa string, upper or lower case, must have even length
+ * @param dest - destination buffer
+ * @param capacity - buffer size
+ * @return destination length, or: -1 (bad args), -2 (bad format), -3 (too long)
+ */
+int console_base16_decode(const char *hex, void *dest, size_t capacity);
+
+#if CONSOLE_USE_MEMSTREAM
+
+/**
+ * Data struct for the filecap utilities
+ */
+struct console_filecap {
+    char *buf;
+    size_t buf_size;
+    FILE *file;
+};
+
+typedef struct console_filecap console_filecap_t;
+
+/**
+ * Open a temporary in-memory file that can be used to capture the output
+ * of functions taking a FILE * argument.
+ *
+ * @param cap - pointer to a filecap struct (can be on stack)
+ * @return success
+ */
+console_err_t console_filecap_init(console_filecap_t *cap);
+
+/**
+ * Clean up the capture struct.
+ *
+ * If the buffer is to be used elsewhere, place NULL in the struct to avoid freeing it.
+ *
+ * If the struct itself was allocated on heap, it is the caller's responsibility to free it manually.
+ *
+ * @param cap - pointer to a filecap struct
+ */
+void console_filecap_end(console_filecap_t *cap);
+
+/**
+ * Print the captured output to console output stream and clean up the struct (calls `console_filecap_end()`)
+ *
+ * @param cap - pointer to a filecap struct
+ */
+void console_filecap_print_end(console_filecap_t *cap);
+
+#endif // CONSOLE_USE_MEMSTREAM
+
+/**
+ * Cross-platform malloc that can be used from console commands.
+ * If CSP is available and the platform is not POSIX, the implementation from there is used (i.e. FreeRTOS alloc)
+ */
+void * __attribute__((malloc)) console_malloc(size_t size);
+
+/**
+ * Cross-platform realloc that can be used from console commands.
+ *
+ * It is not possible to determine the size of an allocated memory region in a portable way,
+ * that's why this function takes the old size as an argument. On POSIX, the argument is simply ignored.
+ *
+ * If CSP is available and the platform is not POSIX, the implementation from there is used (i.e. FreeRTOS alloc).
+ * NOTE: CSP does not provide realloc, therefore this function allocates a new buffer, copies data, and frees the old buffer.
+ *
+ * Returns the original buffer if the new size is <= old size.
+ */
+void * console_realloc(void *ptr, size_t oldsize, size_t newsize);
+
+/**
+ * Cross-platform calloc that can be used from console commands.
+ * If CSP is available and the platform is not POSIX, the implementation from there is used (i.e. FreeRTOS alloc)
+ */
+void * __attribute__((malloc,alloc_size(1,2))) console_calloc(size_t nmemb, size_t size);
+
+/**
+ * `free()` for memory allocated by `console_malloc()` or `console_calloc()`
+ */
+void console_free(void *ptr);
+
+/**
+ * `strdup()` using `console_malloc()`. Free with `console_free()`
+ */
+char * console_strdup(const char *ptr);
+
+/**
+ * `strndup()` using `console_malloc()`. Free with `console_free()`
+ */
+char * console_strndup(const char *ptr, size_t maxlen);
+
+#endif //LIBCONSOLE_UTILS_H
--- a/components/vconsole/libconsole/lib/argtable3/CMakeLists.txt
+++ b/components/vconsole/libconsole/lib/argtable3/CMakeLists.txt
@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(console-argtable3)
+
+add_library(argtable3 argtable3.c)
+target_include_directories(argtable3
+        PUBLIC "."
+)
+target_link_libraries(argtable3 PRIVATE console)
--- a/components/vconsole/libconsole/lib/argtable3/README.txt
+++ b/components/vconsole/libconsole/lib/argtable3/README.txt
@ -0,0 +1,3 @@
+Copy of upstream argtable3 from github
+
+It is released under the 3-clause BSD license.
--- a/components/vconsole/libconsole/lib/argtable3/argtable3.c
+++ b/components/vconsole/libconsole/lib/argtable3/argtable3.c
--- a/components/vconsole/libconsole/lib/argtable3/argtable3.h
+++ b/components/vconsole/libconsole/lib/argtable3/argtable3.h
@ -0,0 +1,306 @@
+/*******************************************************************************
+ * This file is part of the argtable3 library.
+ *
+ * Copyright (C) 1998-2001,2003-2011,2013 Stewart Heitmann
+ * <sheitmann@users.sourceforge.net>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of STEWART HEITMANN nor the  names of its contributors
+ *       may be used to endorse or promote products derived from this software
+ *       without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL STEWART HEITMANN BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ ******************************************************************************/
+
+#ifndef ARGTABLE3
+#define ARGTABLE3
+
+#include <stdio.h>      /* FILE */
+#include <time.h>       /* struct tm */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define ARG_REX_ICASE 1
+    
+/* bit masks for arg_hdr.flag */
+enum
+{
+    ARG_TERMINATOR=0x1,
+    ARG_HASVALUE=0x2,
+    ARG_HASOPTVALUE=0x4
+};
+
+typedef void (arg_resetfn)(void *parent);
+typedef int  (arg_scanfn)(void *parent, const char *argval);
+typedef int  (arg_checkfn)(void *parent);
+typedef void (arg_errorfn)(void *parent, FILE *fp, int error, const char *argval, const char *progname);
+
+
+/*
+* The arg_hdr struct defines properties that are common to all arg_xxx structs.
+* The argtable library requires each arg_xxx struct to have an arg_hdr
+* struct as its first data member.
+* The argtable library functions then use this data to identify the
+* properties of the command line option, such as its option tags,
+* datatype string, and glossary strings, and so on.
+* Moreover, the arg_hdr struct contains pointers to custom functions that
+* are provided by each arg_xxx struct which perform the tasks of parsing
+* that particular arg_xxx arguments, performing post-parse checks, and
+* reporting errors.
+* These functions are private to the individual arg_xxx source code
+* and are the pointer to them are initiliased by that arg_xxx struct's
+* constructor function. The user could alter them after construction
+* if desired, but the original intention is for them to be set by the
+* constructor and left unaltered.
+*/
+struct arg_hdr
+{
+    char         flag;        /* Modifier flags: ARG_TERMINATOR, ARG_HASVALUE. */
+    const char  *shortopts;   /* String defining the short options */
+    const char  *longopts;    /* String defiing the long options */
+    const char  *datatype;    /* Description of the argument data type */
+    const char  *glossary;    /* Description of the option as shown by arg_print_glossary function */
+    int          mincount;    /* Minimum number of occurences of this option accepted */
+    int          maxcount;    /* Maximum number of occurences if this option accepted */
+    void        *parent;      /* Pointer to parent arg_xxx struct */
+    arg_resetfn *resetfn;     /* Pointer to parent arg_xxx reset function */
+    arg_scanfn  *scanfn;      /* Pointer to parent arg_xxx scan function */
+    arg_checkfn *checkfn;     /* Pointer to parent arg_xxx check function */
+    arg_errorfn *errorfn;     /* Pointer to parent arg_xxx error function */
+    void        *priv;        /* Pointer to private header data for use by arg_xxx functions */
+};
+
+struct arg_rem
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+};
+
+struct arg_lit
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    int count;               /* Number of matching command line args */
+};
+
+struct arg_int
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    int count;               /* Number of matching command line args */
+    int *ival;               /* Array of parsed argument values */
+};
+
+struct arg_dbl
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    int count;               /* Number of matching command line args */
+    double *dval;            /* Array of parsed argument values */
+};
+
+struct arg_str
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    int count;               /* Number of matching command line args */
+    const char **sval;       /* Array of parsed argument values */
+};
+
+struct arg_rex
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    int count;               /* Number of matching command line args */
+    const char **sval;       /* Array of parsed argument values */
+};
+
+struct arg_file
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    int count;               /* Number of matching command line args*/
+    const char **filename;   /* Array of parsed filenames  (eg: /home/foo.bar) */
+    const char **basename;   /* Array of parsed basenames  (eg: foo.bar) */
+    const char **extension;  /* Array of parsed extensions (eg: .bar) */
+};
+
+struct arg_date
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    const char *format;      /* strptime format string used to parse the date */
+    int count;               /* Number of matching command line args */
+    struct tm *tmval;        /* Array of parsed time values */
+};
+
+enum {ARG_ELIMIT=1, ARG_EMALLOC, ARG_ENOMATCH, ARG_ELONGOPT, ARG_EMISSARG};
+struct arg_end
+{
+    struct arg_hdr hdr;      /* The mandatory argtable header struct */
+    int count;               /* Number of errors encountered */
+    int *error;              /* Array of error codes */
+    void **parent;           /* Array of pointers to offending arg_xxx struct */
+    const char **argval;     /* Array of pointers to offending argv[] string */
+};
+
+
+/**** arg_xxx constructor functions *********************************/
+
+struct arg_rem* arg_rem(const char* datatype, const char* glossary);
+
+struct arg_lit* arg_lit0(const char* shortopts,
+    const char* longopts,
+    const char* glossary);
+struct arg_lit* arg_lit1(const char* shortopts,
+    const char* longopts,
+    const char *glossary);
+struct arg_lit* arg_litn(const char* shortopts,
+    const char* longopts,
+    int mincount,
+    int maxcount,
+    const char *glossary);
+
+struct arg_key* arg_key0(const char* keyword,
+    int flags,
+    const char* glossary);
+struct arg_key* arg_key1(const char* keyword,
+    int flags,
+    const char* glossary);
+struct arg_key* arg_keyn(const char* keyword,
+    int flags,
+    int mincount,
+    int maxcount,
+    const char* glossary);
+
+struct arg_int* arg_int0(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    const char* glossary);
+struct arg_int* arg_int1(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    const char *glossary);
+struct arg_int* arg_intn(const char* shortopts,
+    const char* longopts,
+    const char *datatype,
+    int mincount,
+    int maxcount,
+    const char *glossary);
+
+struct arg_dbl* arg_dbl0(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    const char* glossary);
+struct arg_dbl* arg_dbl1(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    const char *glossary);
+struct arg_dbl* arg_dbln(const char* shortopts,
+    const char* longopts,
+    const char *datatype,
+    int mincount,
+    int maxcount,
+    const char *glossary);
+
+struct arg_str* arg_str0(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    const char* glossary);
+struct arg_str* arg_str1(const char* shortopts,
+    const char* longopts,                    
+    const char* datatype,
+    const char *glossary);
+struct arg_str* arg_strn(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    int mincount,
+    int maxcount,
+    const char *glossary);
+
+struct arg_rex* arg_rex0(const char* shortopts,
+    const char* longopts,
+    const char* pattern,
+    const char* datatype,
+    int flags,
+    const char* glossary);
+struct arg_rex* arg_rex1(const char* shortopts,
+    const char* longopts,
+    const char* pattern,
+    const char* datatype,
+    int flags,
+    const char *glossary);
+struct arg_rex* arg_rexn(const char* shortopts,
+    const char* longopts,
+    const char* pattern,
+    const char* datatype,
+    int mincount,
+    int maxcount,
+    int flags,
+    const char *glossary);
+
+struct arg_file* arg_file0(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    const char* glossary);
+struct arg_file* arg_file1(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    const char *glossary);
+struct arg_file* arg_filen(const char* shortopts,
+    const char* longopts,
+    const char* datatype,
+    int mincount,
+    int maxcount,
+    const char *glossary);
+
+struct arg_date* arg_date0(const char* shortopts,
+    const char* longopts,
+    const char* format,
+    const char* datatype,
+    const char* glossary);
+struct arg_date* arg_date1(const char* shortopts,
+    const char* longopts,
+    const char* format,
+    const char* datatype,
+    const char *glossary);
+struct arg_date* arg_daten(const char* shortopts,
+    const char* longopts,
+    const char* format,
+    const char* datatype,
+    int mincount,
+    int maxcount,
+    const char *glossary);
+
+struct arg_end* arg_end(int maxerrors);
+
+
+/**** other functions *******************************************/
+int arg_nullcheck(void **argtable);
+int arg_parse(int argc, char **argv, void **argtable);
+void arg_print_option(FILE *fp, const char *shortopts, const char *longopts, const char *datatype, const char *suffix);
+void arg_print_syntax(FILE *fp, void **argtable, const char *suffix);
+void arg_print_syntaxv(FILE *fp, void **argtable, const char *suffix);
+void arg_print_glossary(FILE *fp, void **argtable, const char *format);
+void arg_print_glossary_gnu(FILE *fp, void **argtable);
+void arg_print_errors(FILE* fp, struct arg_end* end, const char* progname);
+void arg_freetable(void **argtable, size_t n);
+void arg_print_formatted(FILE *fp, const unsigned lmargin, const unsigned rmargin, const char *text);
+
+/**** deprecated functions, for back-compatibility only ********/
+void arg_free(void **argtable);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
--- a/components/vconsole/libconsole/src/console.c
+++ b/components/vconsole/libconsole/src/console.c
--- a/components/vconsole/libconsole/src/console_filecap.c
+++ b/components/vconsole/libconsole/src/console_filecap.c
@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <console/console.h>
+#include <console/utils.h>
+#include <malloc.h>
+
+#if CONSOLE_USE_MEMSTREAM
+
+console_err_t console_filecap_init(console_filecap_t *cap) {
+    cap->buf = NULL;
+    cap->buf_size = 0;
+    cap->file = open_memstream(&cap->buf, &cap->buf_size);
+    if (!cap->file) {
+        return CONSOLE_ERR_NO_MEM;
+    }
+    return CONSOLE_OK;
+}
+
+void console_filecap_end(console_filecap_t *cap) {
+    // clean up
+    if (cap->file) {
+        fclose(cap->file);
+        cap->file = NULL;
+    }
+    if (cap->buf) {
+        free(cap->buf); // allocated by memstream
+        cap->buf = NULL;
+    }
+}
+
+void console_filecap_print_end(console_filecap_t *cap) {
+    fflush(cap->file);
+    fclose(cap->file);
+    cap->file = NULL;
+
+    if (cap->buf) {
+        console_write(cap->buf, cap->buf_size);
+        free(cap->buf); // allocated by memstream
+        cap->buf = NULL;
+    }
+}
+
+#endif
--- a/components/vconsole/libconsole/src/console_io.c
+++ b/components/vconsole/libconsole/src/console_io.c
@ -0,0 +1,194 @@
+// enable "vasprintf" from stdio.h
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include "console/console.h"
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+// These are either implemented using unix file descriptors, or in a platform specific way through a void* context
+// - then the user code must provide the implementations.
+#if CONSOLE_USE_FILE_IO_STREAMS
+#include <unistd.h>
+
+bool console_have_stdin_ctx(console_ctx_t *ctx)
+{
+    return ctx && ctx->in &&
+        !feof(ctx->in);
+}
+
+/**
+ * Write to console context.
+ *
+ * This is also a Linenoise write callback.
+ *
+ * Return number of characters written, -1 on error.
+ */
+int __attribute__((weak)) console_write_ctx(console_ctx_t *ctx, const char *text, size_t len) {
+    if (!ctx || !ctx->out) {
+        return -1;
+    }
+
+    size_t written = fwrite(text, 1, len, ctx->out);
+    if (written != len) {
+        return -1;
+    }
+
+    return (int) written;
+}
+
+/**
+ * Read from console context's input stream.
+ *
+ * This is also a Linenoise read callback.
+ *
+ * Return number of characters read, -1 on error
+ */
+int __attribute__((weak)) console_read_ctx(console_ctx_t *ctx, char *dest, size_t count) {
+    if (!console_have_stdin_ctx(ctx)) return -1;
+    ssize_t readn = fread(dest, 1, (size_t) count, ctx->in);
+    return (int) readn;
+}
+
+#if CONSOLE_USE_TERMIOS
+#include <termio.h>
+
+int console_can_read_ctx(console_ctx_t *ctx) {
+    if (!console_have_stdin_ctx(ctx)) return -1;
+
+    int fd = fileno(ctx->in);
+
+    struct termios original;
+    tcgetattr(fd, &original);
+
+    struct termios term;
+    memcpy(&term, &original, sizeof(term));
+
+    term.c_lflag &= ~ICANON;
+    tcsetattr(fd, TCSANOW, &term);
+
+    int characters_buffered = 0;
+    ioctl(fd, FIONREAD, &characters_buffered);
+
+    tcsetattr(fd, TCSANOW, &original);
+
+    return characters_buffered;
+}
+#endif // CONSOLE_USE_TERMIOS
+
+#endif // CONSOLE_USE_FILEDES_IO
+
+ssize_t console_printf_ctx(console_ctx_t *ctx, console_color_t color, const char *format, ...) {
+    if (!ctx) return -1;
+    va_list list;
+    va_start(list, format);
+    ssize_t len = console_vprintf_ctx(ctx, color, format, list);
+    va_end(list);
+    return len;
+}
+
+ssize_t console_vprintf_ctx(console_ctx_t *ctx, console_color_t color, const char *format, va_list args) {
+    if (!ctx) return -1;
+
+    if (ctx->use_colors && color != COLOR_RESET) {
+        switch(color) {
+            case COLOR_BLACK:
+                console_write_ctx(ctx, "\x1b[30;1m", 7);
+                break;
+            case COLOR_RED:
+                console_write_ctx(ctx, "\x1b[31;1m", 7);
+                break;
+            case COLOR_GREEN:
+                console_write_ctx(ctx, "\x1b[32;1m", 7);
+                break;
+            case COLOR_YELLOW:
+                console_write_ctx(ctx, "\x1b[33;1m", 7);
+                break;
+            case COLOR_BLUE:
+                console_write_ctx(ctx, "\x1b[34;1m", 7);
+                break;
+            case COLOR_MAGENTA:
+                console_write_ctx(ctx, "\x1b[35;1m", 7);
+                break;
+            case COLOR_CYAN:
+                console_write_ctx(ctx, "\x1b[36;1m", 7);
+                break;
+                //case COLOR_WHITE:
+            default:
+                console_write_ctx(ctx, "\x1b[37;1m", 7);
+                break;
+        }
+    }
+
+    char *buf = NULL;
+    ssize_t len = vasprintf(&buf, format, args);
+    if (buf && len >= 0) {
+        // change to actual len written, can also result in -1 on error
+        len = console_write_ctx(ctx, buf, (size_t) len);
+        free(buf); // allocated by vasprintf
+    }
+
+    if (ctx->use_colors && color != COLOR_RESET) {
+        console_write_ctx(ctx, "\x1b[0m", 4);
+        len += 7+4;
+    }
+    return len;
+}
+
+int console_print_ctx(console_ctx_t *ctx, const char *text) {
+    if (!ctx) return -1;
+
+    return console_write_ctx(ctx, text, (int) strlen(text));
+}
+
+ssize_t console_println_ctx(console_ctx_t *ctx, const char *text) {
+    if (!ctx) return -1;
+
+    ssize_t n = console_write_ctx(ctx, text, (int) strlen(text));
+    if (n < 0) return n;
+    ssize_t m = console_write_ctx(ctx, "\n", 2);
+    if (m < 0) return m;
+    return n + m;
+}
+
+// ---------------- convenience functions -------------------
+
+bool console_have_stdin(void) {
+    if (!console_context_available()) return false;
+    return console_have_stdin_ctx(console_active_ctx);
+}
+
+int console_can_read(void) {
+    if (!console_have_stdin()) return -1; // Input not available
+    return console_can_read_ctx(console_active_ctx);
+}
+
+/**
+ * Linenoise read callback.
+ *
+ * Return number of characters read, -1 on error
+ */
+ssize_t vconsole_read(char *dest, size_t count) {
+    if (!console_have_stdin()) return -1;
+    return console_read_ctx(console_active_ctx, dest, count);
+}
+
+/**
+ * Linenoise write callback.
+ *
+ * Return number of characters written, -1 on error.
+ */
+ssize_t vconsole_write(const char *text, size_t len) {
+    if (!console_context_available()) return -1;
+    return console_write_ctx(console_active_ctx, text, len);
+}
+
+ssize_t console_println(const char *text) {
+    if (!console_context_available()) return -1;
+    return console_println_ctx(console_active_ctx, text);
+}
--- a/components/vconsole/libconsole/src/console_linenoise.c
+++ b/components/vconsole/libconsole/src/console_linenoise.c
--- a/components/vconsole/libconsole/src/console_linenoise.h
+++ b/components/vconsole/libconsole/src/console_linenoise.h
@ -0,0 +1,248 @@
+/* linenoise.h -- VERSION 1.0
+ *
+ * Guerrilla line editing library against the idea that a line editing lib
+ * needs to be 20,000 lines of C code.
+ *
+ * See linenoise.c for more information.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * Copyright (c) 2010-2014, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * THIS IS A MODIFIED VERSION THAT REMOVES GLOBAL STATE AND SUPPORTS
+ * OTHER IO THAN STDOUT/STDIN.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *  *  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *  *  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LINENOISE_H
+#define LINENOISE_H
+
+#ifndef LINENOISE_HISTORY_MAX_LINE
+#define LINENOISE_HISTORY_MAX_LINE 512
+#endif
+
+#include <stddef.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "console/config.h"
+
+typedef struct linenoiseCompletions {
+    size_t len;
+    char **cvec;
+} linenoiseCompletions;
+
+/**
+ * Get completions
+ */
+typedef void (linenoiseCompletionCallback)(const char *typed, linenoiseCompletions *);
+
+/**
+ * Get a hint for typed text
+ */
+typedef char* (linenoiseHintsCallback)(const char *typed, int *color, int *bold);
+
+/**
+ * Dispose of a hint returned by `linenoiseHintsCallback()`
+ */
+typedef void (linenoiseFreeHintsCallback)(void *);
+
+/**
+ * Linenoise write callback.
+ *
+ * Return number of characters written, -1 on error.
+ * "ctx" may be a fd cast to void* or other value passed during LN init
+ */
+typedef int (linenoiseWrite)(void *ctx, const char *text, int len);
+
+/**
+ * Linenoise read callback.
+ *
+ * Return number of characters read, -1 on error;
+ * "ctx" may be a fd cast to void* or other value passed during LN init
+ */
+typedef int (linenoiseRead)(void *ctx, char *dest, int count);
+
+/**
+ * Linenoise state; exposed in header to allow static allocation
+ *
+ * Use `linenoiseStateInit()` to set default values.
+ *
+ * To shutdown, use `linenoiseHistoryFree()` and then free the struct as needed.
+ */
+struct linenoiseState {
+    bool mlmode;  /* Multi line mode. Default is single line. */
+    bool dumbmode; /* Dumb mode where line editing is disabled. Off by default */
+    bool echomode; /* Echo (meaningful only in dumb mode) */
+    bool allowCtrlDExit;
+    int history_max_len;
+    int history_len;
+    char **history;
+
+    char *buf;          /* Edited line buffer. */
+    size_t buflen;      /* Edited line buffer size. */
+    const char *prompt; /* Prompt to display. */
+    size_t plen;        /* Prompt length. */
+    int pos;         /* Current cursor position. */
+    int oldpos;      /* Previous refresh cursor position. */
+    int len;         /* Current edited line length. */
+    int cols;        /* Number of columns in terminal. */
+    int maxrows;     /* Maximum num of rows used so far (multiline mode) */
+    int history_index;  /* The history index we are currently editing. */
+
+    linenoiseCompletionCallback *completionCallback;
+    linenoiseHintsCallback *hintsCallback;
+    linenoiseFreeHintsCallback *freeHintsCallback;
+
+    void *rwctx;
+    linenoiseWrite *write;
+    linenoiseRead *read;
+};
+
+/**
+ * Initialize the state struct to defaults.
+ *
+ * Before the library is used, also set prompt, buffer,
+ * the read/write callbacks, r/w context (if used),
+ * completion, hint and free-hint callbacks
+ */
+void consLnStateInit(struct linenoiseState *ls);
+
+/** Set buffer and its capacity */
+static inline void consLnSetBuf(struct linenoiseState *ls, char *buf, size_t cap) {
+    ls->buf = buf;
+    ls->buflen = cap - 1; /* Make sure there is always space for the nulterm */
+}
+
+/** Set prompt pointer. Can be constant or dynamically allocated.
+ * Will NOT be mutated by the library. */
+static inline void consLnSetPrompt(struct linenoiseState *ls, const char *prompt) {
+    ls->prompt = prompt;
+}
+
+/** Set buffer and its capacity */
+static inline void consLnSetReadWrite(struct linenoiseState *ls, linenoiseRead *read, linenoiseWrite *write, void *ctx) {
+    ls->read = read;
+    ls->write = write;
+    ls->rwctx = ctx;
+}
+
+/** Set completion CB */
+static inline void consLnSetCompletionCallback(struct linenoiseState *ls, linenoiseCompletionCallback *compl) {
+    ls->completionCallback = compl;
+}
+
+/** Set hint CB */
+static inline void consLnSetHintsCallback(struct linenoiseState *ls, linenoiseHintsCallback *hints) {
+    ls->hintsCallback = hints;
+}
+
+/** Set free hints CB */
+static inline void consLnSetFreeHintsCallback(struct linenoiseState *ls, linenoiseFreeHintsCallback *freeh) {
+    ls->freeHintsCallback = freeh;
+}
+
+/** This function is used by the callback function registered by the user
+ * in order to add completion options given the input string when the
+ * user typed <tab>. See the example.c source code for a very easy to
+ * understand example.
+ *
+ * The completion will be duplicated, it does not need to live past calling
+ * this function.
+ * */
+void consLnAddCompletion(linenoiseCompletions *lc, const char *text);
+
+/** The high level function that is the main API of the linenoise library. */
+int consLnReadLine(struct linenoiseState *ls); // buffer is in "ls"
+
+/** This is the API call to add a new entry in the linenoise history.
+ * It uses a fixed array of char pointers that are shifted (memmoved)
+ * when the history max length is reached in order to remove the older
+ * entry and make room for the new one, so it is not exactly suitable for huge
+ * histories, but will work well for a few hundred of entries.
+ *
+ * Using a circular buffer is smarter, but a bit more complex to handle. */
+int consLnHistoryAdd(struct linenoiseState *ls, const char *line);
+
+/** Set the maximum length for the history. This function can be called even
+ * if there is already some history, the function will make sure to retain
+ * just the latest 'len' elements if the new history length value is smaller
+ * than the amount of items already inside the history. */
+int consLnHistorySetMaxLen(struct linenoiseState *ls, int len);
+
+#if CONSOLE_FILE_SUPPORT
+/** Save the history in the specified file. On success 0 is returned,
+ * on error -1 is returned. */
+int consLnHistorySave(struct linenoiseState *ls, const char *filename);
+
+/** Load the history from the specified file. If the file does not exist
+ * zero is returned and no operation is performed.
+ *
+ * If the file exists and the operation succeeded 0 is returned, otherwise
+ * on error -1 is returned. */
+int consLnHistoryLoad(struct linenoiseState *ls, const char *filename);
+#endif
+
+/** Free history buffer for instance */
+void consLnHistoryFree(struct linenoiseState *ls);
+
+/** Clear the screen. Used to handle ctrl+l */
+void consLnClearScreen(struct linenoiseState *ls);
+
+/** Set if to use or not the multi line mode. */
+static inline void consLnSetMultiLine(struct linenoiseState *ls, int ml) {
+    ls->mlmode = ml;
+}
+
+/** Get ml mode state */
+static inline bool consLnGetMultiLine(struct linenoiseState *ls) {
+    return ls->mlmode;
+}
+
+/** Set if terminal does not recognize escape sequences */
+static inline void consLnSetDumbMode(struct linenoiseState *ls, int dumb)  {
+    ls->dumbmode = dumb;
+}
+
+/** Get dumb mode state */
+static inline bool consLnGetDumbMode(struct linenoiseState *ls) {
+    return ls->dumbmode;
+}
+
+/** Enable/disable echo on keypress (only applies to dumb mode) */
+static inline void consLnSetEchoMode(struct linenoiseState *ls, int set) {
+    ls->echomode = set;
+}
+
+/** Get echo mode state */
+static inline bool consLnGetEchoMode(struct linenoiseState *ls) {
+    return ls->echomode;
+}
+
+#endif /* LINENOISE_H */
--- a/components/vconsole/libconsole/src/console_prefix_match.c
+++ b/components/vconsole/libconsole/src/console_prefix_match.c
@ -0,0 +1,196 @@
+#include <stddef.h>
+#include <stdbool.h>
+#include <string.h>
+#include "console/prefix_match.h"
+
+int prefix_match(const char *value, const char **options, int flags) {
+    flags &= ~PREFIXMATCH_MULTI_PARTIAL; // this doesn't make sense here
+    bool case_sensitive = PREFIXMATCH_CASE_SENSITIVE == (flags & PREFIXMATCH_CASE_SENSITIVE);
+    bool can_abbrev = 0 == (flags & PREFIXMATCH_NOABBREV);
+
+    int (*cmpfn) (const char *, const char *) = case_sensitive ? strcmp : strcasecmp;
+    int (*ncmpfn) (const char *, const char *, size_t) = case_sensitive ? strncmp : strncasecmp;
+
+    if (!value || !options) return -1;
+    size_t input_len = strlen(value);
+    const char *option = NULL;
+    int counter = 0;
+    int result = -1;
+    while (NULL != (option = options[counter])) {
+        if (cmpfn(option, value) == 0) {
+            return counter; // full exact match
+        } else {
+            // Test for partial match
+            if (can_abbrev && ncmpfn(value, option, input_len) == 0) {
+                if (result == -1) {
+                    result = counter; // first partial match
+                } else {
+                    // ambiguous match
+                    return -1;
+                }
+            }
+        }
+        counter++;
+    }
+    return result;
+}
+
+size_t pm_word_len(const char * restrict word, const char * restrict delims) {
+    char d;
+    const char *dp = delims;
+    size_t word_len = 0;
+    if (!word || !delims) return 0;
+    while ('\0' != (d = *dp++)) {
+        char *end = strchr(word, d);
+        if (NULL == end) continue;
+        size_t len = end - word;
+        if (!word_len || len < word_len) {
+            word_len = len;
+        }
+    }
+    if (!word_len) {
+        word_len = strlen(word);
+    }
+    return word_len;
+}
+
+size_t pm_count_words(const char * restrict sentence, const char * restrict delims) {
+    char c;
+    size_t n = 0;
+    bool in_word = false;
+    if (!sentence || !delims) return 0;
+    while (0 != (c = *sentence++)) {
+        bool is_delim = NULL != strchr(delims, c);
+        if (is_delim && in_word) {
+            in_word = false;
+        } else if (!in_word && !is_delim) {
+            n++;
+            in_word = true;
+        }
+    }
+    return n;
+}
+
+const char *pm_skip_words(const char * restrict sentence, const char * restrict delims, size_t skip) {
+    char c;
+    size_t n = 0;
+    bool in_word = false;
+    if (!sentence || !delims) return NULL;
+    while (0 != (c = *sentence++)) {
+        bool is_delim = NULL != strchr(delims, c);
+        if (is_delim && in_word) {
+            in_word = false;
+            skip--;
+            if (skip == 0) {
+                return sentence - 1;
+            }
+        } else if (!in_word && !is_delim) {
+            n++;
+            in_word = true;
+        }
+    }
+    return sentence - 1;
+}
+
+enum pm_test_result prefix_multipart_test(
+    const char * restrict tested,
+    const char* restrict full,
+    const char * restrict delims,
+    int flags
+) {
+    bool case_sensitive = PREFIXMATCH_CASE_SENSITIVE == (flags & PREFIXMATCH_CASE_SENSITIVE);
+    bool can_abbrev = 0 == (flags & PREFIXMATCH_NOABBREV);
+
+    int (*ncmpfn) (const char *, const char *, size_t) = case_sensitive ? strncmp : strncasecmp;
+    // lazy shortcut first...
+    if ((case_sensitive && 0 == strcmp(tested, full)) || (!case_sensitive && 0 == strcasecmp(tested, full))) {
+        return PM_TEST_MATCH; // full match
+    }
+
+    const char *word_t = tested;
+    const char *word_f = full;
+    size_t word_t_len = 0;
+    size_t word_f_len = 0;
+    while (1) {
+        word_t += word_t_len;
+        word_f += word_f_len;
+
+        // advance past leading delims, if any
+        while (*word_t != '\0' && NULL != strchr(delims, *word_t)) word_t++;
+        while (*word_f != '\0' && NULL != strchr(delims, *word_f)) word_f++;
+
+        // test for terminator
+        if (*word_t == '\0' && *word_f == '\0') {
+            // both ended at the same number of words
+            return PM_TEST_MATCH; // full match
+        }
+
+        if (*word_t == '\0' || *word_f == '\0') {
+            // sentences ended at different length
+            if (0 != (flags & PREFIXMATCH_MULTI_PARTIAL) && *word_f != '\0') { // word prefix match (a is a prefix of b)
+                return PM_TEST_MATCH_MULTI_PARTIAL;
+            } else {
+                return PM_TEST_NO_MATCH;
+            }
+        }
+
+        // find end of the words
+        word_t_len = pm_word_len(word_t, delims);
+        word_f_len = pm_word_len(word_f, delims);
+
+        if (word_t_len > word_f_len || (!can_abbrev && word_t_len != word_f_len)) {
+            return PM_TEST_NO_MATCH;
+        }
+
+        int cmp = ncmpfn(word_t, word_f, word_t_len);
+        if (0 != cmp) { // words differ
+            return PM_TEST_NO_MATCH;
+        }
+    }
+}
+
+int prefix_multipart_match(const char * restrict value, const char **options, const char * restrict delims, int flags) {
+    bool multi_partial = 0 != (flags & PREFIXMATCH_MULTI_PARTIAL);
+    flags &= ~PREFIXMATCH_MULTI_PARTIAL; // turn it off for passing the to test fn
+    bool can_abbrev = 0 == (flags & PREFIXMATCH_NOABBREV);
+
+    if (!value || !options) return -1;
+    const char *option = NULL;
+    int counter = 0;
+    int result = -1;
+    int result_partial = -1; // -1=none yet, -2=ambiguous multi-word partial, >=0=index
+    int result_partial_nwords = 0;
+    while (NULL != (option = options[counter])) {
+        if (PM_TEST_MATCH == prefix_multipart_test(value, option, delims, flags | PREFIXMATCH_NOABBREV)) {
+            return counter; // full exact match
+        } else if (can_abbrev) {
+            // Test for partial match
+            if (PM_TEST_MATCH == prefix_multipart_test(value, option, delims, flags)) {
+                if (result == -1) {
+                    result = counter; // first partial match in all words
+                } else {
+                    return -1;
+                }
+            } else if (multi_partial && PM_TEST_MATCH_MULTI_PARTIAL == prefix_multipart_test(value, option, delims, flags | PREFIXMATCH_MULTI_PARTIAL)) {
+                int nwords = pm_count_words(option, delims);
+                if (result_partial == -1 || result_partial_nwords < nwords) {
+                    result_partial = counter; // first partial match
+                    result_partial_nwords = nwords;
+                } else {
+                    result_partial = -2;
+                }
+            }
+        }
+        counter++;
+    }
+
+    if (result != -1) {
+        return result;
+    }
+
+    if (result_partial >= 0) {
+        return result_partial;
+    }
+
+    return -1;
+}
--- a/components/vconsole/libconsole/src/console_split_argv.c
+++ b/components/vconsole/libconsole/src/console_split_argv.c
@ -0,0 +1,120 @@
+// Copyright 2016-2017 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+
+#define SS_FLAG_ESCAPE 0x8
+
+typedef enum {
+    /* parsing the space between arguments */
+    SS_SPACE = 0x0,
+    /* parsing an argument which isn't quoted */
+    SS_ARG = 0x1,
+    /* parsing a quoted argument */
+    SS_QUOTED_ARG = 0x2,
+    /* parsing an escape sequence within unquoted argument */
+    SS_ARG_ESCAPED = SS_ARG | SS_FLAG_ESCAPE,
+    /* parsing an escape sequence within a quoted argument */
+    SS_QUOTED_ARG_ESCAPED = SS_QUOTED_ARG | SS_FLAG_ESCAPE,
+} split_state_t;
+
+size_t console_split_argv(char *line, char **argv, size_t argv_size)
+{
+    const int QUOTE = '"';
+    const int ESCAPE = '\\';
+    const int SPACE = ' ';
+    split_state_t state = SS_SPACE;
+    int argc = 0;
+    char *next_arg_start = line;
+    char *out_ptr = line;
+    for (char *in_ptr = line; argc < (int)(argv_size - 1); ++in_ptr) {
+        int char_in = (unsigned char) *in_ptr;
+        if (char_in == 0) {
+            break;
+        }
+        int char_out = -1;
+
+        /* helper function, called when done with an argument */
+        void end_arg() {
+            char_out = 0;
+            argv[argc++] = next_arg_start;
+            state = SS_SPACE;
+        }
+
+        switch (state) {
+        case SS_SPACE:
+            if (char_in == SPACE) {
+                /* skip space */
+            } else if (char_in == QUOTE) {
+                next_arg_start = out_ptr;
+                state = SS_QUOTED_ARG;
+            } else if (char_in == ESCAPE) {
+                next_arg_start = out_ptr;
+                state = SS_ARG_ESCAPED;
+            } else {
+                next_arg_start = out_ptr;
+                state = SS_ARG;
+                char_out = char_in;
+            }
+            break;
+
+        case SS_QUOTED_ARG:
+            if (char_in == QUOTE) {
+                end_arg();
+            } else if (char_in == ESCAPE) {
+                state = SS_QUOTED_ARG_ESCAPED;
+            } else {
+                char_out = char_in;
+            }
+            break;
+
+        case SS_ARG_ESCAPED:
+        case SS_QUOTED_ARG_ESCAPED:
+            if (char_in == ESCAPE || char_in == QUOTE || char_in == SPACE) {
+                char_out = char_in;
+            } else {
+                /* unrecognized escape character, skip */
+            }
+            state = (split_state_t) (state & (~SS_FLAG_ESCAPE));
+            break;
+
+        case SS_ARG:
+            if (char_in == SPACE) {
+                end_arg();
+            } else if (char_in == ESCAPE) {
+                state = SS_ARG_ESCAPED;
+            } else {
+                char_out = char_in;
+            }
+            break;
+        }
+        /* need to output anything? */
+        if (char_out >= 0) {
+            *out_ptr = char_out;
+            ++out_ptr;
+        }
+    }
+    /* make sure the final argument is terminated */
+    *out_ptr = 0;
+    /* finalize the last argument */
+    if (state != SS_SPACE && argc < ((int)argv_size - 1)) {
+        argv[argc++] = next_arg_start;
+    }
+    /* add a NULL at the end of argv */
+    argv[argc] = NULL;
+
+    return argc;
+}
--- a/components/vconsole/libconsole/src/console_split_argv.h
+++ b/components/vconsole/libconsole/src/console_split_argv.h
@ -0,0 +1,36 @@
+/**
+ * Command argument splitting
+ * 
+ * Created on 2020/02/28.
+ */
+
+#ifndef VCOM_CONSOLE_SPLIT_ARGV_H
+#define VCOM_CONSOLE_SPLIT_ARGV_H
+
+/**
+ * @brief Split command line into arguments in place
+ *
+ * - This function finds whitespace-separated arguments in the given input line.
+ *
+ *     'abc def 1 20 .3' -> [ 'abc', 'def', '1', '20', '.3' ]
+ *
+ * - Argument which include spaces may be surrounded with quotes. In this case
+ *   spaces are preserved and quotes are stripped.
+ *
+ *     'abc "123 456" def' -> [ 'abc', '123 456', 'def' ]
+ *
+ * - Escape sequences may be used to produce backslash, double quote, and space:
+ *
+ *     'a\ b\\c\"' -> [ 'a b\c"' ]
+ *
+ * Pointers to at most argv_size - 1 arguments are returned in argv array.
+ * The pointer after the last one (i.e. argv[argc]) is set to NULL.
+ *
+ * @param line pointer to buffer to parse; it is modified in place
+ * @param argv array where the pointers to arguments are written
+ * @param argv_size number of elements in argv_array (max. number of arguments)
+ * @return number of arguments found (argc)
+ */
+size_t console_split_argv(char *line, char **argv, size_t argv_size);
+
+#endif //VCOM_CONSOLE_SPLIT_ARGV_H
--- a/components/vconsole/libconsole/src/console_utils.c
+++ b/components/vconsole/libconsole/src/console_utils.c
@ -0,0 +1,204 @@
+//
+// Created by MightyPork on 2020/03/11.
+//
+
+#include <string.h>
+#include <stdint.h>
+#include "console/console.h"
+#include "console/utils.h"
+
+#if (CONSOLE_HAVE_CSP && !CSP_POSIX) || CONSOLE_TESTING_ALLOC_FUNCS
+    #include <csp/arch/csp_malloc.h>
+#else
+    #include <malloc.h>
+#endif
+
+// Based on: https://stackoverflow.com/a/7776146/2180189
+void console_hexdump(const void *data, size_t len)
+{
+    size_t i;
+    char asciibuf[17];
+    const unsigned char *pc = (const unsigned char *) data;
+
+    // Length checks.
+
+    if (len <= 0) {
+        console_print("BAD LENGTH\r\n");
+        return;
+    }
+
+    // Process every byte in the data.
+    for (i = 0; i < len; i++) {
+        size_t ai = i % 16;
+
+        // Multiple of 16 means new line (with line offset).
+        if (ai == 0) {
+            // Don't print ASCII buffer for the "zeroth" line.
+            if (i != 0) {
+                console_printf(" |%s|\r\n", asciibuf);
+            }
+
+            // Output the offset.
+
+            console_printf("%4d :", (int)i);
+        }
+
+        // Now the hex code for the specific character.
+        console_printf(" %02x", pc[i]);
+
+        // And buffer a printable ASCII character for later.
+        if ((pc[i] < 0x20) || (pc[i] > 0x7e)) {
+            asciibuf[ai] = '.';
+        }
+        else {
+            asciibuf[ai] = (char) pc[i];
+        }
+
+        asciibuf[ai + 1] = '\0';
+    }
+
+    // Pad out last line if not exactly 16 characters.
+    while ((i % 16) != 0) {
+        console_print("   ");
+        i++;
+    }
+
+    // And print the final ASCII buffer.
+    console_printf(" |%s|\r\n", asciibuf);
+}
+
+static int hex_char_decode(char x)
+{
+    if (x >= '0' && x <= '9') {
+        return x - '0';
+    }
+    else if (x >= 'a' && x <= 'f') {
+        return 10 + (x - 'a');
+    }
+    else if (x >= 'A' && x <= 'F') {
+        return 10 + (x - 'A');
+    }
+    else {
+        return -1;
+    }
+}
+
+int console_base16_decode(const char *hex, void *dest, size_t capacity)
+{
+    if (!hex || !dest) return -1;
+
+    const char *px = (const char *) hex;
+    uint8_t *pd = (unsigned char *) dest;
+    int hlen = (int) strlen(hex);
+    if (hlen % 2) {
+        return -2;
+    }
+    int blen = hlen / 2;
+    if (blen > (int) capacity) {
+        return -3;
+    }
+
+    int v;
+    uint8_t byte;
+    for (int i = 0; i < blen; i++) {
+        v = hex_char_decode(*px++);
+        if (v == -1) {
+            return -2;
+        }
+
+        byte = (v & 0x0F) << 4;
+
+        v = hex_char_decode(*px++);
+        if (v == -1) {
+            return -2;
+        }
+
+        byte |= (v & 0x0F);
+
+        *pd++ = byte;
+    }
+
+    return blen;
+}
+
+void * __attribute__((malloc)) console_malloc(size_t size) {
+    #if (CONSOLE_HAVE_CSP && !CSP_POSIX) || CONSOLE_TESTING_ALLOC_FUNCS
+        return csp_malloc(size);
+    #else
+        return malloc(size);
+    #endif
+}
+
+void * console_realloc(void *ptr, size_t oldsize, size_t newsize) {
+    #if (CONSOLE_HAVE_CSP && !CSP_POSIX) || CONSOLE_TESTING_ALLOC_FUNCS
+        // csp / freertos do not provide realloc, simply allocate a new one and copy data over.
+
+        if (oldsize >= newsize) {
+            // no realloc needed
+            if (!ptr) { // NULL was given, act as malloc
+                ptr = csp_malloc(newsize);
+            }
+            return ptr;
+        }
+
+        void *tmp = csp_malloc(newsize);
+        if (!tmp) {
+            // "If realloc() fails, the original block is left untouched; it is not freed or moved."
+            return NULL;
+        }
+        if (ptr) {
+            // copy if there is anything to copy from
+            memcpy(tmp, ptr, oldsize); // we know oldsize < newsize, otherwise the check above returns.
+            // discard the old buffer
+            csp_free(ptr);
+        }
+        return tmp;
+    #else
+        (void) oldsize; // unused
+        return realloc(ptr, newsize);
+    #endif
+}
+
+void * __attribute__((malloc,alloc_size(1,2))) console_calloc(size_t nmemb, size_t size) {
+    #if (CONSOLE_HAVE_CSP && !CSP_POSIX) || CONSOLE_TESTING_ALLOC_FUNCS
+        return csp_calloc(nmemb, size);
+    #else
+        return calloc(nmemb, size);
+    #endif
+}
+
+void console_free(void *ptr) {
+    #if (CONSOLE_HAVE_CSP && !CSP_POSIX) || CONSOLE_TESTING_ALLOC_FUNCS
+        return csp_free(ptr);
+    #else
+        return free(ptr);
+    #endif
+}
+
+char * console_strdup(const char *ptr) {
+    #if (CONSOLE_HAVE_CSP && !CSP_POSIX) || CONSOLE_TESTING_ALLOC_FUNCS
+        if (!ptr) return NULL;
+        size_t len = strlen(ptr);
+        char *copy = console_malloc(len+1);
+        if (!copy) return NULL;
+        strncpy(copy, ptr, len);
+        copy[len]=0;
+        return copy;
+    #else
+        return strdup(ptr);
+    #endif
+}
+
+char * console_strndup(const char *ptr, size_t maxlen) {
+    #if (CONSOLE_HAVE_CSP && !CSP_POSIX) || CONSOLE_TESTING_ALLOC_FUNCS
+        if (!ptr) return NULL;
+        size_t len = strnlen(ptr, maxlen);
+        char *copy = console_malloc(len+1);
+        if (!copy) return NULL;
+        strncpy(copy, ptr, len);
+        copy[len]=0;
+        return copy;
+    #else
+        return strndup(ptr, maxlen);
+    #endif
+}
--- a/components/vconsole/libconsole/src/queue.h
+++ b/components/vconsole/libconsole/src/queue.h
@ -0,0 +1,645 @@
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)queue.h	8.5 (Berkeley) 8/20/94
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_QUEUE_H_
+#define _SYS_QUEUE_H_
+
+#include <sys/cdefs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * This file defines four types of data structures: singly-linked lists,
+ * singly-linked tail queues, lists and tail queues.
+ *
+ * A singly-linked list is headed by a single forward pointer. The elements
+ * are singly linked for minimum space and pointer manipulation overhead at
+ * the expense of O(n) removal for arbitrary elements. New elements can be
+ * added to the list after an existing element or at the head of the list.
+ * Elements being removed from the head of the list should use the explicit
+ * macro for this purpose for optimum efficiency. A singly-linked list may
+ * only be traversed in the forward direction.  Singly-linked lists are ideal
+ * for applications with large datasets and few or no removals or for
+ * implementing a LIFO queue.
+ *
+ * A singly-linked tail queue is headed by a pair of pointers, one to the
+ * head of the list and the other to the tail of the list. The elements are
+ * singly linked for minimum space and pointer manipulation overhead at the
+ * expense of O(n) removal for arbitrary elements. New elements can be added
+ * to the list after an existing element, at the head of the list, or at the
+ * end of the list. Elements being removed from the head of the tail queue
+ * should use the explicit macro for this purpose for optimum efficiency.
+ * A singly-linked tail queue may only be traversed in the forward direction.
+ * Singly-linked tail queues are ideal for applications with large datasets
+ * and few or no removals or for implementing a FIFO queue.
+ *
+ * A list is headed by a single forward pointer (or an array of forward
+ * pointers for a hash table header). The elements are doubly linked
+ * so that an arbitrary element can be removed without a need to
+ * traverse the list. New elements can be added to the list before
+ * or after an existing element or at the head of the list. A list
+ * may only be traversed in the forward direction.
+ *
+ * A tail queue is headed by a pair of pointers, one to the head of the
+ * list and the other to the tail of the list. The elements are doubly
+ * linked so that an arbitrary element can be removed without a need to
+ * traverse the list. New elements can be added to the list before or
+ * after an existing element, at the head of the list, or at the end of
+ * the list. A tail queue may be traversed in either direction.
+ *
+ * For details on the use of these macros, see the queue(3) manual page.
+ *
+ *
+ *				SLIST	LIST	STAILQ	TAILQ
+ * _HEAD			+	+	+	+
+ * _HEAD_INITIALIZER		+	+	+	+
+ * _ENTRY			+	+	+	+
+ * _INIT			+	+	+	+
+ * _EMPTY			+	+	+	+
+ * _FIRST			+	+	+	+
+ * _NEXT			+	+	+	+
+ * _PREV			-	-	-	+
+ * _LAST			-	-	+	+
+ * _FOREACH			+	+	+	+
+ * _FOREACH_SAFE		+	+	+	+
+ * _FOREACH_REVERSE		-	-	-	+
+ * _FOREACH_REVERSE_SAFE	-	-	-	+
+ * _INSERT_HEAD			+	+	+	+
+ * _INSERT_BEFORE		-	+	-	+
+ * _INSERT_AFTER		+	+	+	+
+ * _INSERT_TAIL			-	-	+	+
+ * _CONCAT			-	-	+	+
+ * _REMOVE_AFTER		+	-	+	-
+ * _REMOVE_HEAD			+	-	+	-
+ * _REMOVE			+	+	+	+
+ *
+ */
+#ifdef QUEUE_MACRO_DEBUG
+/* Store the last 2 places the queue element or head was altered */
+struct qm_trace {
+	char * lastfile;
+	int lastline;
+	char * prevfile;
+	int prevline;
+};
+
+#define	TRACEBUF	struct qm_trace trace;
+#define	TRASHIT(x)	do {(x) = (void *)-1;} while (0)
+#define	QMD_SAVELINK(name, link)	void **name = (void *)&(link)
+
+#define	QMD_TRACE_HEAD(head) do {					\
+	(head)->trace.prevline = (head)->trace.lastline;		\
+	(head)->trace.prevfile = (head)->trace.lastfile;		\
+	(head)->trace.lastline = __LINE__;				\
+	(head)->trace.lastfile = __FILE__;				\
+} while (0)
+
+#define	QMD_TRACE_ELEM(elem) do {					\
+	(elem)->trace.prevline = (elem)->trace.lastline;		\
+	(elem)->trace.prevfile = (elem)->trace.lastfile;		\
+	(elem)->trace.lastline = __LINE__;				\
+	(elem)->trace.lastfile = __FILE__;				\
+} while (0)
+
+#else
+#define	QMD_TRACE_ELEM(elem)
+#define	QMD_TRACE_HEAD(head)
+#define	QMD_SAVELINK(name, link)
+#define	TRACEBUF
+#define	TRASHIT(x)
+#endif	/* QUEUE_MACRO_DEBUG */
+
+/*
+ * Singly-linked List declarations.
+ */
+#define	SLIST_HEAD(name, type)						\
+struct name {								\
+	struct type *slh_first;	/* first element */			\
+}
+
+#define	SLIST_HEAD_INITIALIZER(head)					\
+	{ NULL }
+
+#define	SLIST_ENTRY(type)						\
+struct {								\
+	struct type *sle_next;	/* next element */			\
+}
+
+/*
+ * Singly-linked List functions.
+ */
+#define	SLIST_EMPTY(head)	((head)->slh_first == NULL)
+
+#define	SLIST_FIRST(head)	((head)->slh_first)
+
+#define	SLIST_FOREACH(var, head, field)					\
+	for ((var) = SLIST_FIRST((head));				\
+	    (var);							\
+	    (var) = SLIST_NEXT((var), field))
+
+#define	SLIST_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = SLIST_FIRST((head));				\
+	    (var) && ((tvar) = SLIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	SLIST_FOREACH_PREVPTR(var, varp, head, field)			\
+	for ((varp) = &SLIST_FIRST((head));				\
+	    ((var) = *(varp)) != NULL;					\
+	    (varp) = &SLIST_NEXT((var), field))
+
+#define	SLIST_INIT(head) do {						\
+	SLIST_FIRST((head)) = NULL;					\
+} while (0)
+
+#define	SLIST_INSERT_AFTER(slistelm, elm, field) do {			\
+	SLIST_NEXT((elm), field) = SLIST_NEXT((slistelm), field);	\
+	SLIST_NEXT((slistelm), field) = (elm);				\
+} while (0)
+
+#define	SLIST_INSERT_HEAD(head, elm, field) do {			\
+	SLIST_NEXT((elm), field) = SLIST_FIRST((head));			\
+	SLIST_FIRST((head)) = (elm);					\
+} while (0)
+
+#define	SLIST_NEXT(elm, field)	((elm)->field.sle_next)
+
+#define	SLIST_REMOVE(head, elm, type, field) do {			\
+	QMD_SAVELINK(oldnext, (elm)->field.sle_next);			\
+	if (SLIST_FIRST((head)) == (elm)) {				\
+		SLIST_REMOVE_HEAD((head), field);			\
+	}								\
+	else {								\
+		struct type *curelm = SLIST_FIRST((head));		\
+		while (SLIST_NEXT(curelm, field) != (elm))		\
+			curelm = SLIST_NEXT(curelm, field);		\
+		SLIST_REMOVE_AFTER(curelm, field);			\
+	}								\
+	TRASHIT(*oldnext);						\
+} while (0)
+
+#define SLIST_REMOVE_AFTER(elm, field) do {				\
+	SLIST_NEXT(elm, field) =					\
+	    SLIST_NEXT(SLIST_NEXT(elm, field), field);			\
+} while (0)
+
+#define	SLIST_REMOVE_HEAD(head, field) do {				\
+	SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field);	\
+} while (0)
+
+/*
+ * Singly-linked Tail queue declarations.
+ */
+#define	STAILQ_HEAD(name, type)						\
+struct name {								\
+	struct type *stqh_first;/* first element */			\
+	struct type **stqh_last;/* addr of last next element */		\
+}
+
+#define	STAILQ_HEAD_INITIALIZER(head)					\
+	{ NULL, &(head).stqh_first }
+
+#define	STAILQ_ENTRY(type)						\
+struct {								\
+	struct type *stqe_next;	/* next element */			\
+}
+
+/*
+ * Singly-linked Tail queue functions.
+ */
+#define	STAILQ_CONCAT(head1, head2) do {				\
+	if (!STAILQ_EMPTY((head2))) {					\
+		*(head1)->stqh_last = (head2)->stqh_first;		\
+		(head1)->stqh_last = (head2)->stqh_last;		\
+		STAILQ_INIT((head2));					\
+	}								\
+} while (0)
+
+#define	STAILQ_EMPTY(head)	((head)->stqh_first == NULL)
+
+#define	STAILQ_FIRST(head)	((head)->stqh_first)
+
+#define	STAILQ_FOREACH(var, head, field)				\
+	for((var) = STAILQ_FIRST((head));				\
+	   (var);							\
+	   (var) = STAILQ_NEXT((var), field))
+
+
+#define	STAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = STAILQ_FIRST((head));				\
+	    (var) && ((tvar) = STAILQ_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	STAILQ_INIT(head) do {						\
+	STAILQ_FIRST((head)) = NULL;					\
+	(head)->stqh_last = &STAILQ_FIRST((head));			\
+} while (0)
+
+#define	STAILQ_INSERT_AFTER(head, tqelm, elm, field) do {		\
+	if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
+		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
+	STAILQ_NEXT((tqelm), field) = (elm);				\
+} while (0)
+
+#define	STAILQ_INSERT_HEAD(head, elm, field) do {			\
+	if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL)	\
+		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
+	STAILQ_FIRST((head)) = (elm);					\
+} while (0)
+
+#define	STAILQ_INSERT_TAIL(head, elm, field) do {			\
+	STAILQ_NEXT((elm), field) = NULL;				\
+	*(head)->stqh_last = (elm);					\
+	(head)->stqh_last = &STAILQ_NEXT((elm), field);			\
+} while (0)
+
+#define	STAILQ_LAST(head, type, field)					\
+	(STAILQ_EMPTY((head)) ?						\
+		NULL :							\
+	        ((struct type *)(void *)				\
+		((char *)((head)->stqh_last) - __offsetof(struct type, field))))
+
+#define	STAILQ_NEXT(elm, field)	((elm)->field.stqe_next)
+
+#define	STAILQ_REMOVE(head, elm, type, field) do {			\
+	QMD_SAVELINK(oldnext, (elm)->field.stqe_next);			\
+	if (STAILQ_FIRST((head)) == (elm)) {				\
+		STAILQ_REMOVE_HEAD((head), field);			\
+	}								\
+	else {								\
+		struct type *curelm = STAILQ_FIRST((head));		\
+		while (STAILQ_NEXT(curelm, field) != (elm))		\
+			curelm = STAILQ_NEXT(curelm, field);		\
+		STAILQ_REMOVE_AFTER(head, curelm, field);		\
+	}								\
+	TRASHIT(*oldnext);						\
+} while (0)
+
+#define	STAILQ_REMOVE_HEAD(head, field) do {				\
+	if ((STAILQ_FIRST((head)) =					\
+	     STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL)		\
+		(head)->stqh_last = &STAILQ_FIRST((head));		\
+} while (0)
+
+#define STAILQ_REMOVE_AFTER(head, elm, field) do {			\
+	if ((STAILQ_NEXT(elm, field) =					\
+	     STAILQ_NEXT(STAILQ_NEXT(elm, field), field)) == NULL)	\
+		(head)->stqh_last = &STAILQ_NEXT((elm), field);		\
+} while (0)
+
+#define STAILQ_SWAP(head1, head2, type) do {				\
+	struct type *swap_first = STAILQ_FIRST(head1);			\
+	struct type **swap_last = (head1)->stqh_last;			\
+	STAILQ_FIRST(head1) = STAILQ_FIRST(head2);			\
+	(head1)->stqh_last = (head2)->stqh_last;			\
+	STAILQ_FIRST(head2) = swap_first;				\
+	(head2)->stqh_last = swap_last;					\
+	if (STAILQ_EMPTY(head1))					\
+		(head1)->stqh_last = &STAILQ_FIRST(head1);		\
+	if (STAILQ_EMPTY(head2))					\
+		(head2)->stqh_last = &STAILQ_FIRST(head2);		\
+} while (0)
+
+#define STAILQ_INSERT_CHAIN_HEAD(head, elm_chead, elm_ctail, field) do {   \
+    if ((STAILQ_NEXT(elm_ctail, field) = STAILQ_FIRST(head)) == NULL ) { \
+        (head)->stqh_last = &STAILQ_NEXT(elm_ctail, field);            \
+    }                                                                      \
+    STAILQ_FIRST(head) = (elm_chead);                                    \
+} while (0)
+
+
+/*
+ * List declarations.
+ */
+#define	LIST_HEAD(name, type)						\
+struct name {								\
+	struct type *lh_first;	/* first element */			\
+}
+
+#define	LIST_HEAD_INITIALIZER(head)					\
+	{ NULL }
+
+#define	LIST_ENTRY(type)						\
+struct {								\
+	struct type *le_next;	/* next element */			\
+	struct type **le_prev;	/* address of previous next element */	\
+}
+
+/*
+ * List functions.
+ */
+
+#if (defined(_KERNEL) && defined(INVARIANTS))
+#define	QMD_LIST_CHECK_HEAD(head, field) do {				\
+	if (LIST_FIRST((head)) != NULL &&				\
+	    LIST_FIRST((head))->field.le_prev !=			\
+	     &LIST_FIRST((head)))					\
+		panic("Bad list head %p first->prev != head", (head));	\
+} while (0)
+
+#define	QMD_LIST_CHECK_NEXT(elm, field) do {				\
+	if (LIST_NEXT((elm), field) != NULL &&				\
+	    LIST_NEXT((elm), field)->field.le_prev !=			\
+	     &((elm)->field.le_next))					\
+	     	panic("Bad link elm %p next->prev != elm", (elm));	\
+} while (0)
+
+#define	QMD_LIST_CHECK_PREV(elm, field) do {				\
+	if (*(elm)->field.le_prev != (elm))				\
+		panic("Bad link elm %p prev->next != elm", (elm));	\
+} while (0)
+#else
+#define	QMD_LIST_CHECK_HEAD(head, field)
+#define	QMD_LIST_CHECK_NEXT(elm, field)
+#define	QMD_LIST_CHECK_PREV(elm, field)
+#endif /* (_KERNEL && INVARIANTS) */
+
+#define	LIST_EMPTY(head)	((head)->lh_first == NULL)
+
+#define	LIST_FIRST(head)	((head)->lh_first)
+
+#define	LIST_FOREACH(var, head, field)					\
+	for ((var) = LIST_FIRST((head));				\
+	    (var);							\
+	    (var) = LIST_NEXT((var), field))
+
+#define	LIST_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = LIST_FIRST((head));				\
+	    (var) && ((tvar) = LIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	LIST_INIT(head) do {						\
+	LIST_FIRST((head)) = NULL;					\
+} while (0)
+
+#define	LIST_INSERT_AFTER(listelm, elm, field) do {			\
+	QMD_LIST_CHECK_NEXT(listelm, field);				\
+	if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
+		LIST_NEXT((listelm), field)->field.le_prev =		\
+		    &LIST_NEXT((elm), field);				\
+	LIST_NEXT((listelm), field) = (elm);				\
+	(elm)->field.le_prev = &LIST_NEXT((listelm), field);		\
+} while (0)
+
+#define	LIST_INSERT_BEFORE(listelm, elm, field) do {			\
+	QMD_LIST_CHECK_PREV(listelm, field);				\
+	(elm)->field.le_prev = (listelm)->field.le_prev;		\
+	LIST_NEXT((elm), field) = (listelm);				\
+	*(listelm)->field.le_prev = (elm);				\
+	(listelm)->field.le_prev = &LIST_NEXT((elm), field);		\
+} while (0)
+
+#define	LIST_INSERT_HEAD(head, elm, field) do {				\
+	QMD_LIST_CHECK_HEAD((head), field);				\
+	if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL)	\
+		LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
+	LIST_FIRST((head)) = (elm);					\
+	(elm)->field.le_prev = &LIST_FIRST((head));			\
+} while (0)
+
+#define	LIST_NEXT(elm, field)	((elm)->field.le_next)
+
+#define	LIST_REMOVE(elm, field) do {					\
+	QMD_SAVELINK(oldnext, (elm)->field.le_next);			\
+	QMD_SAVELINK(oldprev, (elm)->field.le_prev);			\
+	QMD_LIST_CHECK_NEXT(elm, field);				\
+	QMD_LIST_CHECK_PREV(elm, field);				\
+	if (LIST_NEXT((elm), field) != NULL)				\
+		LIST_NEXT((elm), field)->field.le_prev = 		\
+		    (elm)->field.le_prev;				\
+	*(elm)->field.le_prev = LIST_NEXT((elm), field);		\
+	TRASHIT(*oldnext);						\
+	TRASHIT(*oldprev);						\
+} while (0)
+
+#define LIST_SWAP(head1, head2, type, field) do {			\
+	struct type *swap_tmp = LIST_FIRST((head1));			\
+	LIST_FIRST((head1)) = LIST_FIRST((head2));			\
+	LIST_FIRST((head2)) = swap_tmp;					\
+	if ((swap_tmp = LIST_FIRST((head1))) != NULL)			\
+		swap_tmp->field.le_prev = &LIST_FIRST((head1));		\
+	if ((swap_tmp = LIST_FIRST((head2))) != NULL)			\
+		swap_tmp->field.le_prev = &LIST_FIRST((head2));		\
+} while (0)
+
+/*
+ * Tail queue declarations.
+ */
+#define	TAILQ_HEAD(name, type)						\
+struct name {								\
+	struct type *tqh_first;	/* first element */			\
+	struct type **tqh_last;	/* addr of last next element */		\
+	TRACEBUF							\
+}
+
+#define	TAILQ_HEAD_INITIALIZER(head)					\
+	{ NULL, &(head).tqh_first }
+
+#define	TAILQ_ENTRY(type)						\
+struct {								\
+	struct type *tqe_next;	/* next element */			\
+	struct type **tqe_prev;	/* address of previous next element */	\
+	TRACEBUF							\
+}
+
+/*
+ * Tail queue functions.
+ */
+#if (defined(_KERNEL) && defined(INVARIANTS))
+#define	QMD_TAILQ_CHECK_HEAD(head, field) do {				\
+	if (!TAILQ_EMPTY(head) &&					\
+	    TAILQ_FIRST((head))->field.tqe_prev !=			\
+	     &TAILQ_FIRST((head)))					\
+		panic("Bad tailq head %p first->prev != head", (head));	\
+} while (0)
+
+#define	QMD_TAILQ_CHECK_TAIL(head, field) do {				\
+	if (*(head)->tqh_last != NULL)					\
+	    	panic("Bad tailq NEXT(%p->tqh_last) != NULL", (head)); 	\
+} while (0)
+
+#define	QMD_TAILQ_CHECK_NEXT(elm, field) do {				\
+	if (TAILQ_NEXT((elm), field) != NULL &&				\
+	    TAILQ_NEXT((elm), field)->field.tqe_prev !=			\
+	     &((elm)->field.tqe_next))					\
+		panic("Bad link elm %p next->prev != elm", (elm));	\
+} while (0)
+
+#define	QMD_TAILQ_CHECK_PREV(elm, field) do {				\
+	if (*(elm)->field.tqe_prev != (elm))				\
+		panic("Bad link elm %p prev->next != elm", (elm));	\
+} while (0)
+#else
+#define	QMD_TAILQ_CHECK_HEAD(head, field)
+#define	QMD_TAILQ_CHECK_TAIL(head, headname)
+#define	QMD_TAILQ_CHECK_NEXT(elm, field)
+#define	QMD_TAILQ_CHECK_PREV(elm, field)
+#endif /* (_KERNEL && INVARIANTS) */
+
+#define	TAILQ_CONCAT(head1, head2, field) do {				\
+	if (!TAILQ_EMPTY(head2)) {					\
+		*(head1)->tqh_last = (head2)->tqh_first;		\
+		(head2)->tqh_first->field.tqe_prev = (head1)->tqh_last;	\
+		(head1)->tqh_last = (head2)->tqh_last;			\
+		TAILQ_INIT((head2));					\
+		QMD_TRACE_HEAD(head1);					\
+		QMD_TRACE_HEAD(head2);					\
+	}								\
+} while (0)
+
+#define	TAILQ_EMPTY(head)	((head)->tqh_first == NULL)
+
+#define	TAILQ_FIRST(head)	((head)->tqh_first)
+
+#define	TAILQ_FOREACH(var, head, field)					\
+	for ((var) = TAILQ_FIRST((head));				\
+	    (var);							\
+	    (var) = TAILQ_NEXT((var), field))
+
+#define	TAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = TAILQ_FIRST((head));				\
+	    (var) && ((tvar) = TAILQ_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	TAILQ_FOREACH_REVERSE(var, head, headname, field)		\
+	for ((var) = TAILQ_LAST((head), headname);			\
+	    (var);							\
+	    (var) = TAILQ_PREV((var), headname, field))
+
+#define	TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar)	\
+	for ((var) = TAILQ_LAST((head), headname);			\
+	    (var) && ((tvar) = TAILQ_PREV((var), headname, field), 1);	\
+	    (var) = (tvar))
+
+#define	TAILQ_INIT(head) do {						\
+	TAILQ_FIRST((head)) = NULL;					\
+	(head)->tqh_last = &TAILQ_FIRST((head));			\
+	QMD_TRACE_HEAD(head);						\
+} while (0)
+
+#define	TAILQ_INSERT_AFTER(head, listelm, elm, field) do {		\
+	QMD_TAILQ_CHECK_NEXT(listelm, field);				\
+	if ((TAILQ_NEXT((elm), field) = TAILQ_NEXT((listelm), field)) != NULL)\
+		TAILQ_NEXT((elm), field)->field.tqe_prev = 		\
+		    &TAILQ_NEXT((elm), field);				\
+	else {								\
+		(head)->tqh_last = &TAILQ_NEXT((elm), field);		\
+		QMD_TRACE_HEAD(head);					\
+	}								\
+	TAILQ_NEXT((listelm), field) = (elm);				\
+	(elm)->field.tqe_prev = &TAILQ_NEXT((listelm), field);		\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+	QMD_TRACE_ELEM(&listelm->field);				\
+} while (0)
+
+#define	TAILQ_INSERT_BEFORE(listelm, elm, field) do {			\
+	QMD_TAILQ_CHECK_PREV(listelm, field);				\
+	(elm)->field.tqe_prev = (listelm)->field.tqe_prev;		\
+	TAILQ_NEXT((elm), field) = (listelm);				\
+	*(listelm)->field.tqe_prev = (elm);				\
+	(listelm)->field.tqe_prev = &TAILQ_NEXT((elm), field);		\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+	QMD_TRACE_ELEM(&listelm->field);				\
+} while (0)
+
+#define	TAILQ_INSERT_HEAD(head, elm, field) do {			\
+	QMD_TAILQ_CHECK_HEAD(head, field);				\
+	if ((TAILQ_NEXT((elm), field) = TAILQ_FIRST((head))) != NULL)	\
+		TAILQ_FIRST((head))->field.tqe_prev =			\
+		    &TAILQ_NEXT((elm), field);				\
+	else								\
+		(head)->tqh_last = &TAILQ_NEXT((elm), field);		\
+	TAILQ_FIRST((head)) = (elm);					\
+	(elm)->field.tqe_prev = &TAILQ_FIRST((head));			\
+	QMD_TRACE_HEAD(head);						\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+} while (0)
+
+#define	TAILQ_INSERT_TAIL(head, elm, field) do {			\
+	QMD_TAILQ_CHECK_TAIL(head, field);				\
+	TAILQ_NEXT((elm), field) = NULL;				\
+	(elm)->field.tqe_prev = (head)->tqh_last;			\
+	*(head)->tqh_last = (elm);					\
+	(head)->tqh_last = &TAILQ_NEXT((elm), field);			\
+	QMD_TRACE_HEAD(head);						\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+} while (0)
+
+#define	TAILQ_LAST(head, headname)					\
+	(*(((struct headname *)((head)->tqh_last))->tqh_last))
+
+#define	TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+
+#define	TAILQ_PREV(elm, headname, field)				\
+	(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
+
+#define	TAILQ_REMOVE(head, elm, field) do {				\
+	QMD_SAVELINK(oldnext, (elm)->field.tqe_next);			\
+	QMD_SAVELINK(oldprev, (elm)->field.tqe_prev);			\
+	QMD_TAILQ_CHECK_NEXT(elm, field);				\
+	QMD_TAILQ_CHECK_PREV(elm, field);				\
+	if ((TAILQ_NEXT((elm), field)) != NULL)				\
+		TAILQ_NEXT((elm), field)->field.tqe_prev = 		\
+		    (elm)->field.tqe_prev;				\
+	else {								\
+		(head)->tqh_last = (elm)->field.tqe_prev;		\
+		QMD_TRACE_HEAD(head);					\
+	}								\
+	*(elm)->field.tqe_prev = TAILQ_NEXT((elm), field);		\
+	TRASHIT(*oldnext);						\
+	TRASHIT(*oldprev);						\
+	QMD_TRACE_ELEM(&(elm)->field);					\
+} while (0)
+
+#define TAILQ_SWAP(head1, head2, type, field) do {			\
+	struct type *swap_first = (head1)->tqh_first;			\
+	struct type **swap_last = (head1)->tqh_last;			\
+	(head1)->tqh_first = (head2)->tqh_first;			\
+	(head1)->tqh_last = (head2)->tqh_last;				\
+	(head2)->tqh_first = swap_first;				\
+	(head2)->tqh_last = swap_last;					\
+	if ((swap_first = (head1)->tqh_first) != NULL)			\
+		swap_first->field.tqe_prev = &(head1)->tqh_first;	\
+	else								\
+		(head1)->tqh_last = &(head1)->tqh_first;		\
+	if ((swap_first = (head2)->tqh_first) != NULL)			\
+		swap_first->field.tqe_prev = &(head2)->tqh_first;	\
+	else								\
+		(head2)->tqh_last = &(head2)->tqh_first;		\
+} while (0)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_SYS_QUEUE_H_ */
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@ -0,0 +1,48 @@
+idf_component_register(SRCS
+    user_main.c
+    settings.c
+    shutdown_handlers.c
+    sntp_cli.c
+    utils.c
+    wifi_conn.c
+    mbiface.c
+    actuators.c
+    console/console_ioimpl.c
+    console/console_server.c
+    console/register_cmds.c
+    console/telnet_parser.c
+    console/commands/cmd_dump.c
+    console/commands/cmd_factory_reset.c
+    console/commands/cmd_heap.c
+    console/commands/cmd_ip.c
+    console/commands/cmd_restart.c
+    console/commands/cmd_tasks.c
+    console/commands/cmd_version.c
+    console/commands/cmd_wifi.c
+    console/commands/cmd_pw.c
+    console/commands/cmd_pwm.c
+    INCLUDE_DIRS ".")
+
+find_package(Git REQUIRED)
+
+execute_process(
+    COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE _commit_hash
+)
+# TODO what's this?
+execute_process(
+    COMMAND ${GIT_EXECUTABLE} rev-list --count HEAD
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE _revision_number
+)
+string(REGEX REPLACE "\n" "" _commit_hash "${_commit_hash}")
+string(REGEX REPLACE "\n" "" _revision_number "${_revision_number}")
+string(TIMESTAMP _build_time_stamp)
+
+configure_file(
+    "gitversion.h.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/config/gitversion.h"
+)
+
+include_directories("${CMAKE_CURRENT_BINARY_DIR}/config")
--- a/main/Kconfig.projbuild
+++ b/main/Kconfig.projbuild
@ -0,0 +1,27 @@
+menu "Project configuration"
+
+    menu "Pin mapping"
+        config PIN_STATUSLED
+            int "Status LED pin"
+            default 5
+
+        config PIN_PWM
+            int "Motor PWM pin"
+            default 16
+
+        config PIN_INT
+            int "Counter input"
+            default 21
+    endmenu
+
+    menu "Console"
+        config CONSOLE_TELNET_PORT
+            int "Integrated telnet server listening port"
+            default 23
+
+        config CONSOLE_PW_LEN
+            int "Console max pw len"
+            default 32
+    endmenu
+
+endmenu
--- a/main/actuators.c
+++ b/main/actuators.c
@ -0,0 +1,194 @@
+//
+// Created by MightyPork on 2022/08/20.
+//
+
+#include <driver/ledc.h>
+#include <esp_log.h>
+#include <driver/adc.h>
+#include <esp_adc_cal.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include "freertos/queue.h"
+#include "actuators.h"
+#include "tasks.h"
+#include "settings.h"
+
+static const char *TAG="act";
+
+// TODO move these to settings and make them accessible via modbus
+uint32_t pwm_freq = 3000;
+uint32_t pwm_duty = 600;
+uint32_t pwm_thres = 850;
+uint32_t pwm_on = 1;
+uint32_t last_adc_mv = 0;
+uint32_t tick_count = 0;
+uint32_t tick_count_start = 0;
+uint32_t last_cpm = 0;
+uint32_t count_total = 0;
+float last_usv_h = 0.0f;
+float total_usv = 0.0f;
+
+static xQueueHandle gpio_evt_queue = NULL;
+
+static void IRAM_ATTR gpio_isr_handler(void* arg)
+{
+    uint32_t gpio_num = (uint32_t) arg;
+    xQueueSendFromISR(gpio_evt_queue, &gpio_num, NULL);
+}
+
+static void TickHandlingTask(void* arg)
+{
+    uint32_t io_num;
+    for(;;) {
+        if(xQueueReceive(gpio_evt_queue, &io_num, pdMS_TO_TICKS(20))) {
+            printf("TICK! ");
+            act_statusled_set(0);
+            tick_count++;
+            count_total++;
+        } else {
+            act_statusled_set(1);
+        }
+
+        if (tick_count_start == 0) {
+            tick_count_start = xTaskGetTickCount();
+        } else {
+            if (xTaskGetTickCount() - tick_count_start >= pdMS_TO_TICKS(60000)) {
+                last_cpm = tick_count;
+                tick_count = 0;
+                tick_count_start = xTaskGetTickCount();
+
+                // https://sites.google.com/site/diygeigercounter/technical/gm-tubes-supported
+                last_usv_h = (float)last_cpm / 153.8f;
+                total_usv += (last_usv_h / 60.0f);
+
+                printf("\r\n\r\nCPM = %d ~~ %f uSv/h\r\n\r\n", last_cpm, last_usv_h);
+            }
+        }
+    }
+}
+
+
+void power_task()
+{
+    while (1) {
+        const uint32_t val = act_read_adc();
+        act_pwm_set(val <= pwm_thres);
+        last_adc_mv = val;
+        // basically, just yield
+        vTaskDelay(pdMS_TO_TICKS(1));
+    }
+}
+
+void act_pwm_update_conf()
+{
+    ledc_timer_config_t ledc_timer = {
+            .duty_resolution = LEDC_TIMER_10_BIT,
+            .freq_hz = pwm_freq,
+            .speed_mode = LEDC_HIGH_SPEED_MODE,
+            .timer_num = LEDC_TIMER_1,
+            .clk_cfg = LEDC_AUTO_CLK,
+    };
+    ledc_timer_config(&ledc_timer);
+}
+
+static void pwm_init()
+{
+    act_pwm_update_conf();
+
+    // PWM output
+    ledc_channel_config_t chan = {
+            .channel    = LEDC_CHANNEL_1,
+            .duty       = 512,
+            .gpio_num   = CONFIG_PIN_PWM,
+            .speed_mode = LEDC_HIGH_SPEED_MODE,
+            .hpoint     = 0,
+            .timer_sel  = LEDC_TIMER_1,
+            .flags.output_invert = false,
+    };
+    ledc_channel_config(&chan);
+
+    ledc_set_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_1, 0);
+    ledc_stop(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_1, 0);
+}
+
+void act_pwm_set(bool on)
+{
+    if (on) {
+        pwm_on = 1;
+        ledc_set_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_1, pwm_duty);
+        ledc_update_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_1);
+    } else {
+        pwm_on = 0;
+        ledc_set_duty(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_1, 0);
+        ledc_stop(LEDC_HIGH_SPEED_MODE, LEDC_CHANNEL_1, 0);
+    }
+}
+
+static void led_init()
+{
+    gpio_config_t ioconf = {
+            .mode = GPIO_MODE_OUTPUT,
+            .pin_bit_mask = (1 << CONFIG_PIN_STATUSLED),
+    };
+    gpio_config(&ioconf);
+}
+
+#define DEFAULT_VREF    1100
+#define CHANNEL ADC1_CHANNEL_6 /* 34 */
+#define WIDTH ADC_WIDTH_BIT_12
+#define ATTEN ADC_ATTEN_DB_0
+#define ADCX ADC_UNIT_1
+
+static esp_adc_cal_characteristics_t adc_chars;
+static void adc_init() {
+    adc1_config_width(WIDTH);
+    adc1_config_channel_atten(CHANNEL, ATTEN);
+    esp_adc_cal_characterize(ADCX, ATTEN, WIDTH, DEFAULT_VREF, &adc_chars);
+
+    // route vref to GPIO25 so it can be measured
+    esp_err_t status = adc_vref_to_gpio(ADC_UNIT_2, GPIO_NUM_25);
+    if (status == ESP_OK) {
+        printf("v_ref routed to GPIO\n");
+    } else {
+        printf("failed to route v_ref\n");
+    }
+}
+
+uint32_t act_read_adc()
+{
+    uint32_t raw = adc1_get_raw(CHANNEL);
+    return esp_adc_cal_raw_to_voltage(raw, &adc_chars);
+}
+
+void act_statusled_set(bool on)
+{
+    gpio_set_level(CONFIG_PIN_STATUSLED, (int) on);
+}
+
+static void int_init() {
+
+    gpio_pad_select_gpio(CONFIG_PIN_INT);
+    gpio_set_direction(CONFIG_PIN_INT, GPIO_MODE_INPUT);
+    gpio_pulldown_en(CONFIG_PIN_INT);
+    gpio_pullup_dis(CONFIG_PIN_INT);
+    gpio_set_intr_type(CONFIG_PIN_INT, GPIO_INTR_POSEDGE);
+
+    gpio_evt_queue = xQueueCreate(20, sizeof(int));
+    xTaskCreate(TickHandlingTask, "ticks", 3000, NULL, PRIO_NORMAL, NULL);
+    gpio_isr_handler_add(CONFIG_PIN_INT, gpio_isr_handler, (void *)CONFIG_PIN_INT);
+}
+
+void act_init()
+{
+    pwm_freq = gSettings.pwm_freq;
+    pwm_duty = gSettings.pwm_duty;
+    pwm_thres = gSettings.pwm_thres;
+
+    led_init();
+    pwm_init();
+    adc_init();
+    act_statusled_set(1); // = off
+
+    xTaskCreate(power_task, "pwr", 3000, NULL, PRIO_HIGH, NULL);
+    int_init();
+}
--- a/main/actuators.h
+++ b/main/actuators.h
@ -0,0 +1,29 @@
+//
+// Created by MightyPork on 2022/08/20.
+//
+
+#ifndef FANCTL_ACTUATORS_H
+#define FANCTL_ACTUATORS_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+void act_init();
+
+extern uint32_t pwm_freq;
+extern uint32_t pwm_duty;
+extern uint32_t pwm_on;
+extern uint32_t pwm_thres;
+extern uint32_t last_adc_mv;
+extern uint32_t last_cpm;
+extern uint32_t count_total;
+extern float last_usv_h;
+extern float total_usv;
+
+void act_pwm_set(bool on);
+void act_pwm_update_conf();
+
+void act_statusled_set(bool on);
+uint32_t act_read_adc();
+
+#endif //FANCTL_ACTUATORS_H
--- a/main/application.h
+++ b/main/application.h
@ -0,0 +1,26 @@
+/**
+ * Globals
+ */
+
+#ifndef _APPLICATION_H
+#define _APPLICATION_H
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/event_groups.h>
+#include "sdkconfig.h"
+#include "settings.h"
+#include "gitversion.h"
+
+#define EG_WIFI_CONNECTED_BIT BIT0
+extern EventGroupHandle_t g_wifi_event_group;
+
+#define WIFI_CONNECTED_BIT BIT0
+#define WIFI_FAIL_BIT      BIT1
+
+esp_err_t cspemu_add_shutdown_handler(shutdown_handler_t handler);
+void cspemu_run_shutdown_handlers(void);
+
+#define APP_NAME "RECUP"
+#define APP_VERSION "v1"
+
+#endif //_APPLICATION_H
--- a/main/component.mk
+++ b/main/component.mk
@ -0,0 +1,4 @@
+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)
--- a/main/console/cmd_common.h
+++ b/main/console/cmd_common.h
@ -0,0 +1,48 @@
+//
+// Created by MightyPork on 2018/12/02.
+//
+
+#ifndef CSPEMU_CMD_COMMON_H
+#define CSPEMU_CMD_COMMON_H
+
+#include "console_server.h"
+
+//// prototypes (TODO remove..)
+//void csp_vprintf(const char *format, va_list args);
+//void csp_printf(const char *format, ...);
+
+#define EOL "\r\n"
+
+#define console_printf_e(format, ...) console_printf("\x1b[31m" format "\x1b[m", ##__VA_ARGS__)
+#define console_printf_w(format, ...) console_printf("\x1b[33m" format "\x1b[m", ##__VA_ARGS__)
+#define console_fputs(str) console_print(str)
+#define console_fputsn(str, len) console_write(str, len)
+#define console_fputc(c) console_write(&c, 1)
+
+#define MSG_ON  "\x1b[32mON\x1b[m"
+#define MSG_ENABLED  "\x1b[32mENABLED\x1b[m"
+#define MSG_OFF "\x1b[31mOFF\x1b[m"
+#define MSG_DISABLED "\x1b[31mDISABLED\x1b[m"
+
+//#define ARG_OPTIONAL_NODE_ID() cmd_args.node->count ? cmd_args.node->ival[0] : csp_get_address()
+
+#if 0
+struct cmd_no_args_s {
+    struct arg_end *end;
+};
+
+extern struct cmd_no_args_s cmd_no_args;
+
+#define CMD_CHECK_ARGS(struct_var) do { \
+    int nerrors = arg_parse(argc, argv, (void**) &struct_var); \
+    if (nerrors != 0) { \
+        console_print_errors(struct_var.end, argv[0]); \
+        return 1; \
+    } \
+} while(0)
+
+/** Report & return error if any args were given to this command */
+#define CMD_CHECK_NO_ARGS() CMD_CHECK_ARGS(cmd_no_args)
+#endif
+
+#endif //CSPEMU_CMD_COMMON_H
--- a/main/console/commands/cmd_dump.c
+++ b/main/console/commands/cmd_dump.c
@ -0,0 +1,34 @@
+//
+// Created by MightyPork on 2018/12/08.
+//
+#include "settings.h"
+#include "console/cmd_common.h"
+#include <console/cmddef.h>
+
+
+static int cmd_dump(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_end *end;
+    } cmd_args;
+
+    if (reg) {
+        cmd_args.end = arg_end(1);
+
+        reg->argtable = &cmd_args;
+        reg->command = "dump";
+        reg->help = "Dump node info";
+        return 0;
+    }
+
+    console_printf("WiFi enabled: %d\r\n", gSettings.wifi_enabled);
+
+    // TODO show more settings
+
+    return 0;
+}
+
+void register_cmd_dump(void)
+{
+    console_cmd_register(cmd_dump, "dump");
+}
--- a/main/console/commands/cmd_factory_reset.c
+++ b/main/console/commands/cmd_factory_reset.c
@ -0,0 +1,50 @@
+//
+// Created by MightyPork on 2018/12/08.
+//
+
+#include <string.h>
+#include <linenoise/linenoise.h>
+#include <settings.h>
+#include <utils.h>
+#include <nvs_flash.h>
+
+#include "console/cmd_common.h"
+#include <console/cmddef.h>
+
+
+static int cmd_factory_reset(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_str *magic;
+        struct arg_end *end;
+    } cmd_args;
+
+    if (reg) {
+        cmd_args.magic = arg_str1(NULL, NULL, "<passphrase>", "Passphrase to prevent accidental erase. Must be 'confirm'");
+        cmd_args.end = arg_end(2);
+
+        reg->argtable = &cmd_args;
+        reg->command = "factory_reset";
+        reg->help = "Wipe non-volatile data memory, restoring everything to defaults.";
+        return 0;
+    }
+
+    if (streq(cmd_args.magic->sval[0], "confirm")) {
+        nvs_flash_erase();
+
+        console_printf("Non-volatile memory erased.\r\n"
+                       "Restarting to apply changes...\r\n\r\n");
+        vTaskDelay(pdMS_TO_TICKS(500));
+        esp_restart();
+    } else {
+        console_printf("Incorrect passphrase.\r\n");
+        return 1;
+    }
+
+    return 0;
+}
+
+void register_cmd_factory_reset(void)
+{
+    console_cmd_register(cmd_factory_reset, "factory_reset");
+}
--- a/main/console/commands/cmd_heap.c
+++ b/main/console/commands/cmd_heap.c
@ -0,0 +1,38 @@
+//
+// Created by MightyPork on 2018/12/08.
+//
+
+#include <esp_heap_caps.h>
+#include <esp_system.h>
+
+#include "console/cmd_common.h"
+#include <console/cmddef.h>
+
+
+/* 'heap' command prints minumum heap size */
+static int cmd_heap(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_end *end;
+    } cmd_args;
+
+    if (reg) {
+        cmd_args.end = arg_end(1);
+
+        reg->argtable = &cmd_args;
+        reg->command = "heap";
+        reg->help = "Get emulator heap usage stats (for debug)";
+        return 0;
+    }
+
+    uint32_t heap_size = heap_caps_get_minimum_free_size(MALLOC_CAP_DEFAULT);
+    uint32_t current_free = esp_get_free_heap_size();
+    console_printf("free heap: %u bytes\r\n"
+                   "   lowest: %u bytes\r\n", current_free, heap_size);
+    return 0;
+}
+
+void register_cmd_heap(void)
+{
+    console_cmd_register(cmd_heap, "heap");
+}
--- a/main/console/commands/cmd_ip.c
+++ b/main/console/commands/cmd_ip.c
@ -0,0 +1,341 @@
+#include <freertos/FreeRTOS.h>
+#include <freertos/event_groups.h>
+#include <esp_wifi.h>
+#include <settings.h>
+#include <lwip/inet.h>
+
+#include "console/cmd_common.h"
+#include <console/cmddef.h>
+#include <application.h>
+#include <common_utils/utils.h>
+#include <sntp_cli.h>
+#include <ping.h>
+#include <lwip/netdb.h>
+
+static int cmd_ip_status(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    EMPTY_CMD_SETUP("Show IP status");
+
+    if (!gSettings.wifi_enabled || !g_State.wifi_inited) {
+        console_color_printf(COLOR_RED, "WiFi interface is disabled\n");
+        return 0;
+    }
+
+    wifi_config_t config;
+    if (ESP_OK == esp_wifi_get_config(ESP_IF_WIFI_STA, &config)) {
+        if (config.sta.ssid[0]) {
+            EventBits_t bits = xEventGroupGetBits(g_wifi_event_group);
+            if (bits & WIFI_CONNECTED_BIT) {
+                console_color_printf(COLOR_GREEN, "Connected to SSID \"%s\"\n", config.sta.ssid);
+            } else if (bits & WIFI_FAIL_BIT) {
+                console_color_printf(COLOR_RED, "WiFi connection failed.\n");
+                console_printf("Saved SSID = \"%s\"\n", config.sta.ssid);
+                return 0;
+            } else {
+                console_color_printf(COLOR_RED, "Not connected, retries may be in progress.\n");
+                console_printf("Saved SSID = \"%s\"\n", config.sta.ssid);
+                return 0;
+            }
+
+            tcpip_adapter_ip_info_t ipinfo;
+            if (ESP_OK == tcpip_adapter_get_ip_info(TCPIP_ADAPTER_IF_STA, &ipinfo)) {
+                // ! inet_ntoa uses a global static buffer, cant use multiple in one printf call
+                console_printf("DHCP: %s\n", gSettings.dhcp_enable ? MSG_ENABLED : MSG_DISABLED " (static IP)");
+                console_printf("IP: %s\n", inet_ntoa(ipinfo.ip.addr));
+                console_printf("Mask: %s\n", inet_ntoa(ipinfo.netmask.addr));
+                console_printf("Gateway: %s\n", inet_ntoa(ipinfo.gw.addr));
+
+                if (!gSettings.dhcp_enable) {
+                    console_printf("DNS: %s\n", inet_ntoa(gSettings.static_dns));
+                }
+
+                uint8_t mac[6];
+                if (ESP_OK == esp_wifi_get_mac(ESP_IF_WIFI_STA, mac)) {
+                    console_printf("MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
+                                   mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+                }
+            } else {
+                console_color_printf(COLOR_RED, "No IP address assigned!\n");
+            }
+        }
+        else {
+            console_color_printf(COLOR_RED, "SSID not configured!\n");
+        }
+    }
+
+    return 0;
+}
+
+static int cmd_ip_pingwd(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_str *cmd;
+        struct arg_end *end;
+    } cmd_args;
+
+    if (reg) {
+        cmd_args.cmd = arg_str0(NULL, NULL, "<cmd>", "Enable or disable. Omit to check current state");
+        cmd_args.end = arg_end(1);
+
+        reg->argtable = &cmd_args;
+        reg->help = "Enable/disable ping watchdog, or check the current setting. The watchdog periodically pings the gateway and restarts WiFi on failure.";
+        return 0;
+    }
+
+    if (cmd_args.cmd->count) {
+        int b = parse_boolean_arg(cmd_args.cmd->sval[0]);
+        if (b < 0) return CONSOLE_ERR_INVALID_ARG;
+        gSettings.dhcp_wd_enable = b;
+        settings_persist(SETTINGS_dhcp_wd_enable);
+    }
+
+    console_printf("Ping WD = %s\n", gSettings.dhcp_wd_enable ? MSG_ENABLED : MSG_DISABLED);
+
+    if (cmd_args.cmd->count) {
+        console_printf("Restart to apply changes\n");
+    }
+
+    return 0;
+}
+
+static void ping_success_print_cb(int bytes, const char *ip, int seq, int elapsed_ms) {
+    console_printf("Rx %d bytes from %s: icmp_seq=%d time=%d ms\n", bytes, ip, seq, (int) elapsed_ms);
+}
+
+static void ping_fail_print_cb(int seq) {
+    console_printf("Request timeout for icmp_seq %d\n", seq);
+}
+
+static int cmd_ip_ping(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_str *ip;
+        struct arg_int *num;
+        struct arg_int *timeout;
+        struct arg_int *interval;
+        struct arg_int *size;
+        struct arg_end *end;
+    } args;
+
+    if (reg) {
+        args.ip = arg_str1(NULL, NULL, "<IP>", "Target IP");
+        args.num = arg_int0("n", NULL, "<num>", "Ping count (def 1)");
+        args.timeout = arg_int0("t", NULL, "<ms>", "Timeout (def 3000)");
+        args.interval = arg_int0("i", NULL, "<ms>", "Interval (def 1000)");
+        args.size = arg_int0("s", NULL, "<bytes>", "Payload size (def 32)");
+        args.end = arg_end(5);
+
+        reg->argtable = &args;
+        reg->help = "Ping a host using ICMP";
+        return 0;
+    }
+
+    ping_opts_t opts = PING_CONFIG_DEFAULT();
+    opts.success_cb = ping_success_print_cb;
+    opts.fail_cb = ping_fail_print_cb;
+    opts.count = args.num->count ? args.num->ival[0] : 1;
+    opts.payload_size = args.size->count ? args.size->ival[0] : 32;
+    opts.interval_ms = args.interval->count ? args.interval->ival[0] : 1000;
+    opts.timeout_ms = args.timeout->count ? args.timeout->ival[0] : 3000;
+
+    if (0 == inet_aton(args.ip->sval[0], &opts.ip_addr)) {
+        // we could have received a domain name here
+        struct hostent * ent = gethostbyname(args.ip->sval[0]);
+        if (!ent) {
+            console_println("Could not resolve");
+            return CONSOLE_ERR_IO;
+        }
+
+        memcpy(&opts.ip_addr, ent->h_addr_list[0], sizeof(ip4_addr_t));
+        console_printf("Resolved as %s\n", inet_ntoa(opts.ip_addr));
+    }
+
+    ping_result_t result = {};
+    esp_err_t ret = ping(&opts, &result);
+
+    if (ret != ESP_OK) {
+        console_println("Ping error");
+        return ret;
+    } else {
+        console_printf("%d tx, %d rx, %.1f%% loss, latency min %d ms, max %d ms\n",
+                       result.sent,
+                       result.received,
+                       result.loss_pt,
+                       result.min_time_ms,
+                       result.max_time_ms);
+    }
+
+    return 0;
+}
+
+static int cmd_ip_static_set(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_str *ip;
+        struct arg_str *gw;
+        struct arg_str *mask;
+        struct arg_str *dns;
+        struct arg_str *cmd;
+        struct arg_end *end;
+    } args;
+
+    if (reg) {
+        args.ip = arg_str0("a", NULL, "<IP>", "Set IP address");
+        args.gw = arg_str0("g", NULL, "<GW>", "Set gateway address");
+        args.mask = arg_str0("n", NULL, "<MASK>", "Set netmask");
+        args.dns = arg_str0("d", NULL, "<DNS>", "Set DNS server IP");
+        args.cmd = arg_str0(NULL, NULL, "{enable|disable}", "Enable or disable static IP");
+        args.end = arg_end(1);
+
+        reg->argtable = &args;
+        reg->help = "Configure, enable/disable, or check config of static IP.";
+        return 0;
+    }
+
+    bool any_change = false;
+
+    if (args.ip->count) {
+        uint32_t a = 0;
+        if (!inet_aton(args.ip->sval[0], &a)) {
+            console_println("Invalid IP");
+            return CONSOLE_ERR_INVALID_ARG;
+        }
+        gSettings.static_ip = a; // aton output is already in network byte order
+        settings_persist(SETTINGS_static_ip);
+        any_change = true;
+    }
+
+    if (args.gw->count) {
+        uint32_t a = 0;
+        if (!inet_aton(args.gw->sval[0], &a)) {
+            console_println("Invalid GW");
+            return CONSOLE_ERR_INVALID_ARG;
+        }
+        gSettings.static_ip_gw = a; // aton output is already in network byte order
+        settings_persist(SETTINGS_static_ip_gw);
+        any_change = true;
+    }
+
+    if (args.mask->count) {
+        uint32_t a = 0;
+        if (!inet_aton(args.mask->sval[0], &a)) {
+            console_println("Invalid mask");
+            return CONSOLE_ERR_INVALID_ARG;
+        }
+        gSettings.static_ip_mask = a; // aton output is already in network byte order
+        settings_persist(SETTINGS_static_ip_mask);
+        any_change = true;
+    }
+
+    if (args.dns->count) {
+        uint32_t a = 0;
+        if (!inet_aton(args.dns->sval[0], &a)) {
+            console_println("Invalid DNS IP");
+            return CONSOLE_ERR_INVALID_ARG;
+        }
+        gSettings.static_dns = a; // aton output is already in network byte order
+        settings_persist(SETTINGS_static_dns);
+        any_change = true;
+    }
+
+    if (args.cmd->count) {
+        int b = parse_boolean_arg(args.cmd->sval[0]);
+        if (b < 0) return CONSOLE_ERR_INVALID_ARG;
+        gSettings.dhcp_enable = !b;
+        settings_persist(SETTINGS_dhcp_enable);
+        any_change = true;
+    }
+
+    console_printf("Static IP: %s\n", gSettings.dhcp_enable ? MSG_DISABLED : MSG_ENABLED);
+    console_printf("- IP: %s\n", inet_ntoa(gSettings.static_ip));
+    console_printf("- Mask: %s\n", inet_ntoa(gSettings.static_ip_mask));
+    console_printf("- Gateway: %s\n", inet_ntoa(gSettings.static_ip_gw));
+    console_printf("- DNS: %s\n", inet_ntoa(gSettings.static_dns));
+
+    if (any_change) {
+        console_println("Restart to apply changes.");
+    }
+
+    return 0;
+}
+
+static int cmd_ip_ntp(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_str *cmd;
+        struct arg_str *addr;
+        struct arg_end *end;
+    } cmd_args;
+
+    if (reg) {
+        cmd_args.cmd = arg_str0(NULL, NULL, "<cmd>", "Enable or disable autostart. Omit to check current state. start = start now");
+        cmd_args.addr = arg_str0("s", NULL, "<server>", "Set NTP server");
+        cmd_args.end = arg_end(2);
+
+        reg->argtable = &cmd_args;
+        reg->help = "Check or modify NTP client setting, or start it manually.";
+        return 0;
+    }
+
+    if (cmd_args.addr->count) {
+        strncpy(gSettings.ntp_srv, cmd_args.addr->sval[0], NTP_SRV_LEN);
+        gSettings.ntp_srv[NTP_SRV_LEN - 1] = 0;
+        settings_persist(SETTINGS_ntp_srv);
+        console_printf("NTP server set to %s\n", gSettings.ntp_srv);
+    }
+
+    if (cmd_args.cmd->count) {
+        if (streq(cmd_args.cmd->sval[0], "start")) {
+            bool started = sntp_cli_start();
+            if (started) {
+                console_printf("NTP client started manually.\n");
+            } else {
+                console_color_printf(COLOR_RED, "Start failed. Client may be already running.\n");
+            }
+            return 0;
+        }
+
+        int b = parse_boolean_arg(cmd_args.cmd->sval[0]);
+        if (b < 0) return CONSOLE_ERR_INVALID_ARG;
+        gSettings.ntp_enable = b;
+
+        settings_persist(SETTINGS_ntp_enable);
+    }
+
+    console_printf("Client status: %s\n", gSettings.ntp_enable ? MSG_ENABLED : MSG_DISABLED);
+    console_printf("NTP server: %s\n", gSettings.ntp_srv);
+
+    /* show the current date */
+    time_t now;
+    struct tm timeinfo;
+    time(&now);
+    localtime_r(&now, &timeinfo);
+
+    if(timeinfo.tm_year < (2016 - 1900)) {
+        console_printf("Device time is not valid.\n");
+    } else {
+        char strftime_buf[64];
+        strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
+        console_printf("The current UTC date/time is: %s\n", strftime_buf);
+    }
+
+    if (cmd_args.cmd->count) {
+        // if it was "start", we returned early.
+        console_printf("Restart to apply changes\n");
+    }
+
+    return 0;
+}
+
+void register_cmd_ip(void)
+{
+    console_group_add("ip", "IP status and settings");
+    console_cmd_register(cmd_ip_status, "ip status");
+    console_cmd_register(cmd_ip_pingwd, "ip wd");
+    console_cmd_register(cmd_ip_ntp, "ip ntp");
+    console_cmd_register(cmd_ip_ping, "ip ping");
+    console_cmd_register(cmd_ip_static_set, "ip static");
+
+    // this may be used for shortcuts like "ip in"
+    console_cmd_add_alias_fn(cmd_ip_status, "ip info");
+}
--- a/main/console/commands/cmd_pw.c
+++ b/main/console/commands/cmd_pw.c
@ -0,0 +1,52 @@
+//
+// Set telnet pw
+//
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/event_groups.h>
+#include <esp_wifi.h>
+#include <settings.h>
+
+#include "console/cmd_common.h"
+#include <console/cmddef.h>
+#include <application.h>
+#include <console/prefix_match.h>
+
+static int cmd_clear(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    EMPTY_CMD_SETUP("Clear access password");
+    console_printf("Access password cleared.\n");
+    gSettings.console_pw[0] = 0;
+    settings_persist(SETTINGS_console_pw);
+    return 0;
+}
+
+static int cmd_set(console_ctx_t *ctx, cmd_signature_t *reg)
+{
+    static struct {
+        struct arg_str *pw;
+        struct arg_end *end;
+    } args;
+
+    if (reg) {
+        args.pw = arg_str1(NULL, NULL, "<password>", EXPENDABLE_STRING("New password"));
+        args.end = arg_end(1);
+
+        reg->argtable = &args;
+        reg->help = EXPENDABLE_STRING("Set access password");
+        return CONSOLE_OK;
+    }
+
+    strncpy(gSettings.console_pw, args.pw->sval[0], CONSOLE_PW_LEN - 1);
+    console_printf("Access pw set to: \"%.*s\"\n", CONSOLE_PW_LEN, args.pw->sval[0]);
+    settings_persist(SETTINGS_console_pw);
+    return 0;
+}
+
+void register_cmd_pw(void)
+{
+    console_group_add("pw", "Access password");
+
+    console_cmd_register(cmd_set, "pw set");
+    console_cmd_register(cmd_clear, "pw clear");
+}
--- a/Show More
+++ b/Show More
				`@ -0,0 +1 @@`
				`ICMP ping implementation for connectivity testing`
				`@ -0,0 +1 @@`
				`Generic TCP socket server that can be used e.g. for telnet`