Introduces new heap debugging feature and fixes some memory leaks in website feature

Introduces a new define HEAP_DEBUG_MESSAGE(location) that can be used to instrument the code to get heap information output on the Serial output. It can be enabled via the define ENABLE_HEAP_DEBUGGING. Also fixes some memory leaks in the website part of the project.

src/debug.h

@@ -0,0 +1,12 @@
+#include <Arduino.h>
+
+
+#ifdef ENABLE_HEAP_DEBUGGING
+    #define HEAP_DEBUG_MESSAGE(location) printHeapDebugData(location);
+#else
+    #define HEAP_DEBUG_MESSAGE(location) 
+#endif
+
+inline void printHeapDebugData(String location){
+    Serial.println("Heap: " + String(ESP.getMinFreeHeap()/1024) + "\t" + String(ESP.getFreeHeap()/1024) + "\t" + String(ESP.getMaxAllocHeap()/1024) + "\t" + location);
+}

src/website.cpp

@@ -10,6 +10,7 @@
 #include <Update.h>
 #include "display.h"
 #include "ota.h"
+#include "debug.h"
 
 #ifndef VERSION
   #define VERSION "1.1.0"
@@ -26,6 +27,7 @@ nfcReaderStateType lastnfcReaderState = NFC_IDLE;
 
 
 void onWsEvent(AsyncWebSocket *server, AsyncWebSocketClient *client, AwsEventType type, void *arg, uint8_t *data, size_t len) {
+    HEAP_DEBUG_MESSAGE("onWsEvent begin");
     if (type == WS_EVT_CONNECT) {
         Serial.println("Neuer Client verbunden!");
         // Sende die AMS-Daten an den neuen Client
@@ -33,6 +35,10 @@ void onWsEvent(AsyncWebSocket *server, AsyncWebSocketClient *client, AwsEventTyp
         sendNfcData(client);
         foundNfcTag(client, 0);
         sendWriteResult(client, 3);
+
+        // Clean up dead connections
+        (*server).cleanupClients();
+        Serial.println("Currently connected number of clients: " + String((*server).getClients().size()));
     } else if (type == WS_EVT_DISCONNECT) {
         Serial.println("Client getrennt.");
     } else if (type == WS_EVT_ERROR) {
@@ -113,7 +119,9 @@ void onWsEvent(AsyncWebSocket *server, AsyncWebSocketClient *client, AwsEventTyp
         else {
             Serial.println("Unbekannter WebSocket-Typ: " + doc["type"].as<String>());
         }
+        doc.clear();
     }
+    HEAP_DEBUG_MESSAGE("onWsEvent end");
 }
 
 // Funktion zum Laden und Ersetzen des Headers in einer HTML-Datei
@@ -280,6 +288,8 @@ void setupWebserver(AsyncWebServer &server) {
             html.replace("{{autoSendTime}}", String(autoSetBambuAmsCounter));
         }
 
+        doc.clear();
+
         request->send(200, "text/html", html);
     });