show free heap

src/main.cpp

@@ -383,6 +383,8 @@ void printValues() {
     Serial.println(sensor_readings.pm10);
   }
 
+  Serial.print("Free HEAP: "); Serial.println(ESP.getFreeHeap());
+
 }
 
 void sendValues() {

src/network/XD0OTA.cpp

@@ -131,5 +131,6 @@ int XD0OTA::checkForUpdates(String url) {
     newVersion = -1;
   }
   httpClient.end();
+  client.stop();
   return newVersion;
 }