You wouldn't believe this simple trick that freed 10 kB of RAM!

CMakeLists.txt

@@ -110,8 +110,6 @@ set(SOURCE_FILES
         user/serial.h
         user/routes.c
         user/routes.h
-        user/uart_asyncdrv.c-
-        user/uart_asyncdrv.h-
         user/cgi_main.c
         user/cgi_main.h
         user/cgi_sockets.c
@@ -155,6 +153,7 @@ include_directories(esp_iot_sdk_v1.5.2/include)
 add_definitions(
         -D__ets__
         -DICACHE_FLASH
+        -DUSE_OPTIMIZE_PRINTF=1
         -DHTTPD_MAX_CONNECTIONS=5
         -DHTTPD_STACKSIZE=1000
         -DICACHE_FLASH_ATTR=

esphttpdconfig.mk

@@ -54,4 +54,6 @@ GLOBAL_CFLAGS = \
     -DHTTPD_MAX_POST_LEN=512 \
     -DDEBUG_INPUT=0 \
     -DDEBUG_HEAP=1 \
-    -DDEBUG_MALLOC=0
+    -DDEBUG_MALLOC=0 \
+    -mforce-l32 \
+    -DUSE_OPTIMIZE_PRINTF=1

html_orig/js/app.js

@@ -1609,22 +1609,27 @@ function tr(key) { return _tr[key] || '?'+key+'?'; }
 	w.startScanning = startScanning;
 })(window.WiFi = {});
 /** Handle connections */
-var Conn = (function() {
+var Conn = (function () {
   var ws;
   var heartbeatTout;
   var pingIv;
   var xoff = false;
   var autoXoffTout;
+  var reconTout;
+
+  var pageShown = false;
 
   function onOpen(evt) {
     console.log("CONNECTED");
+    doSend("i");
   }
 
   function onClose(evt) {
-		console.warn("SOCKET CLOSED, code "+evt.code+". Reconnecting...");
+    console.warn("SOCKET CLOSED, code " + evt.code + ". Reconnecting...");
-		setTimeout(function() {
+    clearTimeout(reconTout);
+    reconTout = setTimeout(function () {
       init();
-		}, 200);
+    }, 2000);
     // this happens when the buffer gets fucked up via invalid unicode.
     // we basically use polling instead of socket then
   }
@@ -1637,12 +1642,18 @@ var Conn = (function() {
         case 'T':
         case 'S':
           Screen.load(evt.data);
+          if(!pageShown) {
+            showPage();
+            pageShown = true;
+          }
           break;
 
         case '-':
           //console.log('xoff');
           xoff = true;
-					autoXoffTout = setTimeout(function(){xoff=false;}, 250);
+          autoXoffTout = setTimeout(function () {
+            xoff = false;
+          }, 250);
           break;
 
         case '+':
@@ -1652,7 +1663,7 @@ var Conn = (function() {
           break;
       }
       heartbeat();
-		} catch(e) {
+    } catch (e) {
       console.error(e);
     }
   }
@@ -1691,24 +1702,16 @@ var Conn = (function() {
       showPage();
       return;
     }
-		heartbeat();
 
-		ws = new WebSocket("ws://"+_root+"/term/update.ws");
+    clearTimeout(reconTout);
+    clearTimeout(heartbeatTout);
+
+    ws = new WebSocket("ws://" + _root + "/term/update.ws");
     ws.onopen = onOpen;
     ws.onclose = onClose;
     ws.onmessage = onMessage;
-
     console.log("Opening socket.");
-
-		// Ask for initial data
-		$.get('http://'+_root+'/term/init', function(resp, status) {
-			if (status !== 200) location.reload(true);
-			console.log("Data received!");
-			Screen.load(resp);
     heartbeat();
-
-			showPage();
-		});
   }
 
   function heartbeat() {
@@ -1718,9 +1721,9 @@ var Conn = (function() {
 
   function heartbeatFail() {
     console.error("Heartbeat lost, probing server...");
-		pingIv = setInterval(function() {
+    pingIv = setInterval(function () {
       console.log("> ping");
-			$.get('http://'+_root+'/system/ping', function(resp, status) {
+      $.get('http://' + _root + '/system/ping', function (resp, status) {
         if (status == 200) {
           clearInterval(pingIv);
           console.info("Server ready, reloading page...");
@@ -1729,7 +1732,7 @@ var Conn = (function() {
       }, {
         timeout: 100,
       });
-		}, 500);
+    }, 1000);
   }
 
   return {

libesphttpd

@@ -1 +1 @@
-Subproject commit 13fa224963081e9ff298abd74a59faafcb9bf816
+Subproject commit 3479ab3efcb4581669370cde6a607f936ff5515a

user/apars_csi.c

@@ -760,7 +760,7 @@ do_csi_xterm_screen_cmd(CSI_Data *opts)
 
 // data tables for the DECREPTPARM command response
 struct DECREPTPARM_parity { int parity; const char * msg; };
-static const struct DECREPTPARM_parity DECREPTPARM_parity_arr[] = {
+static const struct DECREPTPARM_parity DECREPTPARM_parity_arr[] ESP_CONST_DATA = {
 	{PARITY_NONE, "1"},
 	{PARITY_ODD, "4"},
 	{PARITY_EVEN, "5"},
@@ -768,7 +768,7 @@ static const struct DECREPTPARM_parity DECREPTPARM_parity_arr[] = {
 };
 
 struct DECREPTPARM_baud { int baud; const char * msg; };
-static const struct DECREPTPARM_baud DECREPTPARM_baud_arr[] = {
+static const struct DECREPTPARM_baud DECREPTPARM_baud_arr[] ESP_CONST_DATA = {
 	{BIT_RATE_300, "48"},
 	{BIT_RATE_600, "56"},
 	{BIT_RATE_1200, "64"},

user/character_sets.h

@@ -12,7 +12,7 @@
 #define CODEPAGE_A_BEGIN 35
 #define CODEPAGE_A_END 35
 
-static const u16 codepage_A[] =
+static const u16 codepage_A[] ESP_CONST_DATA =
 	{//	Unicode    ASCII   SYM
 		// %%BEGIN:A%%
 		0x20a4, // 35   #   £
@@ -26,7 +26,7 @@ static const u16 codepage_A[] =
  * translates VT100 ACS escape codes to Unicode values.
  * Based on rxvt-unicode screen.C table.
  */
-static const u16 codepage_0[] =
+static const u16 codepage_0[] ESP_CONST_DATA =
 	{//	Unicode    ASCII   SYM
 		// %%BEGIN:0%%
 		0x2666, // 96	`	♦
@@ -66,7 +66,7 @@ static const u16 codepage_0[] =
 #define CODEPAGE_1_BEGIN 33
 #define CODEPAGE_1_END 126
 
-static const u16 codepage_1[] =
+static const u16 codepage_1[] ESP_CONST_DATA =
 	{//	Unicode    ASCII   SYM  DOS
 		// %%BEGIN:1%%
 		0x263A,	// 33	!	☺	(1)  - low ASCII symbols from DOS, moved to +32

user/routes.c

@@ -22,7 +22,7 @@ static int wifiPassFn(HttpdConnData *connData, int no, char *user, int userLen,
 /**
  * Application routes
  */
-HttpdBuiltInUrl routes[] = {
+const HttpdBuiltInUrl routes[] ESP_CONST_DATA = {
 	// redirect func for the captive portal
 	ROUTE_CGI_ARG("*", cgiRedirectApClientToHostname, "esp-terminal.ap"),
 

user/routes.h

@@ -4,7 +4,7 @@
 #include <esp8266.h>
 #include <httpd.h>
 
-extern HttpdBuiltInUrl routes[];
+extern const HttpdBuiltInUrl routes[];
 
 /** Broadcast screen state to sockets */
 void screen_notifyChange();