Have a problem controlling the switch on the Shelly EM via the built-in integration of shelly using CoIoT from HA button entity. My Shelly EM is located on outside my home but I did open the port 5683 default. I can remote login to shelly EM using port forwarding. But I wanting the Cloud control so I am not able to use MQTT. What port shall I open on the remote server so the Button on HA will trigger the Shelly EM switch control relay.