Add free memory reporting to garaga door monitor

src/main.cpp

@@ -258,7 +258,7 @@ void setup(void) {
     server.sendHeader("Connection", "close");
     boolean isOpen = digitalRead(buttonPin) == HIGH;
     server.send(200, "application/json",
-                "{ \"isOpen\": " + String(isOpen ? "true" : "false") + "  }");
+                "{ \"isOpen\": " + String(isOpen ? "true" : "false") + ", \"freeMem\": " + String(esp_get_free_heap_size()) + "  }");
     // send_mqtt("statusquery");
   });
 
@@ -307,6 +307,7 @@ void setup(void) {
   server.begin();
 }
 
+int loopCounter=0;
 void loop(void) {
   /*if (wifiState!=WiFi.status()) {
     Serial.print("Wifi Status Change: ");
@@ -349,4 +350,9 @@ void loop(void) {
     }
     previousState = buttonState;
   }
+
+  if (loopCounter++ > 59){ // log memory every minute.
+    Serial.println("Free memory: " + String(esp_get_free_heap_size()) + " bytes");
+    loopCounter=0;
+  }
 }