reduce RAM needs for -S2, user message on heap emergency actions

Author: softhack007

wled00/const.h

@@ -448,7 +448,7 @@
     #if defined(ARDUINO_ARCH_ESP32C3)
       #define JSON_BUFFER_SIZE 44000 // WLEDMM - max 44KB on -C3 with PSRAM (chip has 400kb RAM)
     #else
-      #define JSON_BUFFER_SIZE 32000 // WLEDMM - max 32KB on -S2 with PSRAM (chip has 320kb RAM)
+      #define JSON_BUFFER_SIZE 28000 // WLEDMM - max 28KB on -S2 with PSRAM (chip has 320kb RAM)
     #endif
   #else
   #define JSON_BUFFER_SIZE 54000 // WLEDMM (was 60000) slightly reduced to avoid build error "region dram0_0_seg overflowed"

wled00/wled.cpp

@@ -1180,16 +1180,19 @@ void WLED::handleConnection()
   #ifdef ARDUINO_ARCH_ESP32 
   // reconnect WiFi to clear stale allocations if heap gets too low
   if (now - heapTime > 5000) { // WLEDMM: updated with better logic for small heap available by block, not total.
-    // uint32_t heap = ESP.getFreeHeap();
+#if defined(ARDUINO_ARCH_ESP32S2)
+    uint32_t heap = ESP.getFreeHeap(); // WLEDMM works better on -S2
+#else
     uint32_t heap = heap_caps_get_largest_free_block(0x1800); // WLEDMM: This is a better metric for free heap.
+#endif
     if (heap < MIN_HEAP_SIZE && lastHeap < MIN_HEAP_SIZE) {
-      DEBUG_PRINT(F("Heap too low! (step 2, force reconnect): "));
-      DEBUG_PRINTLN(heap);
+      USER_PRINT(F("Heap too low! (step 2, force reconnect): "));
+      USER_PRINTLN(heap);
       forceReconnect = true;
       strip.purgeSegments(true); // remove all but one segments from memory
     } else if (heap < MIN_HEAP_SIZE) {
-      DEBUG_PRINT(F("Heap too low! (step 1, flush unread UDP): "));
-      DEBUG_PRINTLN(heap);      
+      USER_PRINT(F("Heap too low! (step 1, flush unread UDP): "));
+      USER_PRINTLN(heap);      
       strip.purgeSegments();
       notifierUdp.flush();
       rgbUdp.flush();