Fix settings JS buffer too small (wled#2323)

Author: Aircoookie

wled00/const.h

@@ -265,7 +265,11 @@
 #endif
 
 // string temp buffer (now stored in stack locally)
-#define OMAX 2048
+#ifdef ESP8266
+#define SETTINGS_STACK_BUF_SIZE 2048
+#else
+#define SETTINGS_STACK_BUF_SIZE 3096 
+#endif
 
 #ifdef WLED_USE_ETHERNET
 #define E131_MAX_UNIVERSE_COUNT 20

wled00/wled.cpp

@@ -42,7 +42,7 @@ bool oappendi(int i)
 bool oappend(const char* txt)
 {
   uint16_t len = strlen(txt);
-  if (olen + len >= OMAX)
+  if (olen + len >= SETTINGS_STACK_BUF_SIZE)
     return false;        // buffer full
   strcpy(obuf + olen, txt);
   olen += len;

wled00/wled_server.cpp

@@ -362,9 +362,10 @@ void serveMessage(AsyncWebServerRequest* request, uint16_t code, const String& h
 String settingsProcessor(const String& var)
 {
   if (var == "CSS") {
-    char buf[2048];
+    char buf[SETTINGS_STACK_BUF_SIZE];
     buf[0] = 0;
     getSettingsJS(optionType, buf);
+    //Serial.println(uxTaskGetStackHighWaterMark(NULL));
     return String(buf);
   }