Fix issue with buffer overflow for too large screen updated too fast

Makefile

@@ -65,7 +65,7 @@ LIBS += esphttpd
 # compiler flags using during compilation of source files
 CFLAGS		= -Os -ggdb -std=gnu99 -Werror -Wpointer-arith -Wundef -Wall -Wl,-EL -fno-inline-functions \
 		-nostdlib -mlongcalls -mtext-section-literals  -D__ets__ -DICACHE_FLASH \
-		-Wno-address -Wno-unused
+		-Wno-address -Wno-unused -DHTTPD_MAX_BACKLOG_SIZE=8192
 
 # linker flags used to generate the main object file
 LDFLAGS		= -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static

libesphttpd

@@ -1 +1 @@
-Subproject commit fba7cec0b6443c5ee71afde9a45cf832c49562c9
+Subproject commit a4e0fed2b281760349ddd107b827d8f6b0f56e02

user/cgi_sockets.c

@@ -6,28 +6,26 @@
 #include "uart_driver.h"
 #include "screen.h"
 
-static volatile bool timer_running = false;
+#define SOCK_BUF_LEN 2048
-static ETSTimer notifyTim;
+static char sock_buff[SOCK_BUF_LEN];
 
 static void notifyTimCb(void *arg) {
-	timer_running = false;
-
 	void *data = NULL;
 
-	const int bufsiz = 1024;
-	char buff[bufsiz];
 	for (int i = 0; i < 20; i++) {
-		httpd_cgi_state cont = screenSerializeToBuffer(buff, bufsiz, &data);
+		httpd_cgi_state cont = screenSerializeToBuffer(sock_buff, SOCK_BUF_LEN, &data);
 		int flg = 0;
 		if (cont == HTTPD_CGI_MORE) flg |= WEBSOCK_FLAG_MORE;
 		if (i > 0) flg |= WEBSOCK_FLAG_CONT;
-		cgiWebsockBroadcast(URL_WS_UPDATE, buff, (int) strlen(buff), flg);
+		cgiWebsockBroadcast(URL_WS_UPDATE, sock_buff, (int) strlen(sock_buff), flg);
 		if (cont == HTTPD_CGI_DONE) break;
 	}
 
-	screenSerializeToBuffer(NULL, bufsiz, &data);
+	screenSerializeToBuffer(NULL, SOCK_BUF_LEN, &data);
 }
 
+static ETSTimer notifyTim;
+
 /**
  * Broadcast screen state to sockets.
  * This is a callback for the Screen module,
@@ -35,9 +33,6 @@ static void notifyTimCb(void *arg) {
  */
 void ICACHE_FLASH_ATTR screen_notifyChange(void)
 {
-	if (timer_running) return;
-
-	timer_running = true;
 	os_timer_disarm(&notifyTim);
 	os_timer_setfn(&notifyTim, notifyTimCb, NULL);
 	os_timer_arm(&notifyTim, 20, 0);