Add come notes

firmware/firmware.ino

@@ -8,11 +8,17 @@
  * - Webserver for /metrics endpoint (Prometheus)
  * - Show current sensor values over simple webpage
  * - Push sensor values to various 3rd party services
+ * - MQTT?
  * 
  * - Auto-Reconnect for WIFI
  * - Buffer sensor values if there is no WIFI connection
  * - Configure weather station over http webinterface
  * - If there are now WiFi credentials, open up an access point to configure it
+ * - OTA firmware update
+ * 
+ * TODO:
+ * - https://sminghub.github.io/Sming/about/ 
+ * - https://github.com/marvinroger/homie-esp8266
  */
 
 float currentSensorData[3] = {0.0, 0.0, 0.0};