From 75c6fe1606e4aae3f534c4c213742c5403839d6e Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Fri, 20 Feb 2026 14:42:39 +0100
Subject: [PATCH] fix "Heap too low!" logic

"step1" (flush udp) was never activated (stupid logic error)
---
 wled00/const.h  | 2 ++
 wled00/wled.cpp | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/wled00/const.h b/wled00/const.h
index 1953d5ee..a422dfdd 100644
--- a/wled00/const.h
+++ b/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)
diff --git a/wled00/wled.cpp b/wled00/wled.cpp
index 64398dac..266bcbd9 100644
--- a/wled00/wled.cpp
+++ b/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);