fix "Heap too low!" logic

"step1" (flush udp) was never activated (stupid logic error)

wled00/const.h

@@ -536,6 +536,8 @@
   #define MIN_HEAP_SIZE (15*1024) // WLED allocation functions (util.cpp) try to keep this much contiguous heap free for other tasks
 #endif
 #endif
+#define MIN_HEAP_CRIT_SIZE (unsigned(MIN_HEAP_SIZE - (MIN_HEAP_SIZE/8)))  // allow 12% margin before for "critical low"
+
 // threshold for PSRAM use: if heap is running low, requests to allocate_buffer(prefer DRAM) above PSRAM_THRESHOLD may be put in PSRAM
 // if heap is depleted, PSRAM will be used regardless of threshold
 #if defined(CONFIG_IDF_TARGET_ESP32S3)

wled00/wled.cpp

@@ -1363,7 +1363,7 @@ void WLED::handleConnection()
     //uint32_t heap = heap_caps_get_largest_free_block(0x1800); // WLEDMM: This is a better metric for free heap.
     uint32_t heap = getContiguousFreeHeap(); // WLEDMM: This is a better metric for free heap.
 #endif
-    if (heap < MIN_HEAP_SIZE && lastHeap < MIN_HEAP_SIZE) {
+    if (heap < MIN_HEAP_CRIT_SIZE && lastHeap < MIN_HEAP_SIZE) { // WLEDMM allow 12% extra margin before "critical"
       if (retryCount < 5) {  // WLEDMM avoid repeated disconnects
         USER_PRINT(F("Heap too low! (step 2, force reconnect): "));
         USER_PRINTLN(heap);