WTF - ESP.getFreeHeap crashing the system for an specific light bulb...

code/espurna/espurna.ino

@@ -212,7 +212,7 @@ void welcome() {
         DEBUG_MSG_P(PSTR("[INIT] Last reset reason: %s\n"), (char *) ESP.getResetReason().c_str());
     }
 
-    DEBUG_MSG_P(PSTR("[INIT] Free heap: %u bytes\n"), ESP.getFreeHeap());
+    DEBUG_MSG_P(PSTR("[INIT] Free heap: %u bytes\n"), getFreeHeap());
     #if ADC_VCC_ENABLED
         DEBUG_MSG_P(PSTR("[INIT] Power: %d mV\n"), ESP.getVcc());
     #endif

code/espurna/settings.ino

@@ -175,7 +175,7 @@ void settingsSetup() {
     });
 
     Embedis::command( F("HEAP"), [](Embedis* e) {
-        DEBUG_MSG_P(PSTR("Free HEAP: %d bytes\n"), ESP.getFreeHeap());
+        DEBUG_MSG_P(PSTR("Free HEAP: %d bytes\n"), getFreeHeap());
         DEBUG_MSG_P(PSTR("+OK\n"));
     });
 

code/espurna/utils.ino

@@ -33,6 +33,14 @@ String getCoreRevision() {
     #endif
 }
 
+// WTF
+// Calling ESP.getFreeHeap() is making the system crash on a specific
+// AiLight bulb, but anywhere else...
+unsigned int getFreeHeap() {
+    if (getSetting("wtfHeap", 0).toInt() == 1) return 9999;
+    return ESP.getFreeHeap();
+}
+
 String buildTime() {
 
     const char time_now[] = __TIME__;   // hh:mm:ss
@@ -79,7 +87,7 @@ unsigned long getUptime() {
 void heartbeat() {
 
     unsigned long uptime_seconds = getUptime();
-    unsigned int free_heap = ESP.getFreeHeap();
+    unsigned int free_heap = getFreeHeap();
 
     // -------------------------------------------------------------------------
     // MQTT

code/espurna/web.ino

@@ -75,8 +75,8 @@ void _onHome(AsyncWebServerRequest *request) {
 
             // Chunked response, we calculate the chunks based on free heap (in multiples of 32)
             // This is necessary when a TLS connection is open since it sucks too much memory
-            DEBUG_MSG_P(PSTR("[MAIN] Free heap: %d bytes\n"), ESP.getFreeHeap());
-            size_t max = (ESP.getFreeHeap() / 3) & 0xFFE0;
+            DEBUG_MSG_P(PSTR("[MAIN] Free heap: %d bytes\n"), getFreeHeap());
+            size_t max = (getFreeHeap() / 3) & 0xFFE0;
 
             AsyncWebServerResponse *response = request->beginChunkedResponse("text/html", [max](uint8_t *buffer, size_t maxLen, size_t index) -> size_t {
 

code/espurna/ws.ino

@@ -333,7 +333,7 @@ void _wsStart(uint32_t client_id) {
         root["network"] = getNetwork();
         root["deviceip"] = getIP();
         root["uptime"] = getUptime();
-        root["heap"] = ESP.getFreeHeap();
+        root["heap"] = getFreeHeap();
         root["sketch_size"] = ESP.getSketchSize();
         root["free_size"] = ESP.getFreeSketchSpace();