Quick Reference

Wiring

• Communication UART on pins Rx, Tx at 115200-8-1-N
• Debug log on pin GPIO2 at 115200-8-1-N
• Use 3.3V logic, or 5V with protection resistors (10k)
• Connect Rx and Tx with a piece of wire to test the terminal alone, you should see what you type in the browser. NOTE: This won't work if your ESP8266 board has a built-in USB-serial.

Screen

• Most ANSI escape sequences are supported.
• The max screen size is 2000 characters (eg. 25x80), default is 10x26. Set using \e]W?;?\a with rows;cols.
• The screen will automatically scroll, can be used for log output.
• Display update is sent after 20 ms of inactivity.
• The browser display needs WebSockets for the real-time updating. It may not work on really old phones / browsers.

Color Reference

Color is set using \e[?m or \e[?;?m where "?" are numbers from the following tables:

Foreground Background

Bright foreground can also be set using the "bold" attribute 1 (eg. \e[31;1m). For more details, see the ANSI code reference below.

User Input

All the user types on their keyboard is sent as-is to the UART, including ESC, ANSI sequences for arrow keys and CR-LF for Enter. The input is limited to ASCII codes 32-126, backspace 8 and tab 9.

The buttons under the screen send ASCII codes 1, 2, 3, 4, 5.

Mouse input (click/tap) is sent as \e?;?M with row;column. You can use this for on-screen buttons, menu navigation etc. Please note this is a custom sequence, not supported by PuTTY or other terminals.

Supported ANSI Escape Sequences

Sequences are started by ASCII code 27 (ESC, \e, \x1b, \033)

Instead of \a (BELL, ASCII 7) in the commands, you can use `\e\` (ESC + backslash). It's the Text Separator code.

Text Attributes

All text attributes are set using \e[...m where the dots are numbers separated by semicolons. You can combine up to 3 attributes in a single command.

Attribute	Meaning
0	Reset text attributes to default
7	Inverse (fg/bg swap when printing)
27	Inverse OFF
30-37, 90-97	Foreground color, normal and bright
40-47, 100-107	Background color, normal and bright

Cursor

Movement commands scroll the screen if needed. The coordinates are 1-based, origin top left.

Code	Params	Meaning
\e[?A	[count]	Move cursor up
\e[?B	[count]	Move cursor down
\e[?C	[count]	Move cursor forward (right)
\e[?D	[count]	Move cursor backward (left)
\e[?E	[count]	Go N line down, start of line
\e[?F	[count]	Go N lines up, start of line
\e[?G	column	Go to column
\e[?;?G	[row=1];[col=1]	Go to row and column
\e[6n	--	Query cursor position. Position is sent back as \e[?;?R with row;column.
\e[s	--	Store position
\e[u	--	Restore position
\e7	--	Store position & attributes
\e8	--	Restore position & attributes
\e[?25l	--	Hide cursor (literal question mark, lowercase L!)
\e[?25h	--	Show cursor (literal question mark!)

Screen

Code	Params	Meaning
\e[?J	[mode=0]	Clear screen. Mode: 0 - from cursor, 1 - to cursor, 2 - all
\e[?K	[mode=0]	Erase line. Mode: 0 - from cursor, 1 - to cursor, 2 - all
\e[?S	[lines]	Scroll screen content up, add empty line at the bottom
\e[?T	[lines]	Scroll screen content down, add empty line at the top
\e]W?;?\a	rows;cols	Set screen size, maximum 25x80 (resp. total 2000 characters). This also clears the screen.

System Commands

Code	Params	Meaning
\ec	--	"Device Reset" - clear screen, reset attributes, show cursor & move it to 1,1. The screen size and WiFi settings stay unchanged.
\e]FR\a	--	"Factory Reset", emergency code when you mess up the WiFi, restores SSID to unique default, clears stored credentials & enters Client+AP mode.
\e[5n	--	Query device status, replies with \e[0n "device is OK". Can be used to check if the UART works.