I have an old Sonoff TH16 (like this one) flashed with the Tasmota firmware to use it via MQTT. I have a mosquitto broker on an external server.
It ran fine for several months inside my friend's LAN but since a couple of weeks it's able to transmit a sensor packet only few times per day. In the rest of the time I get the LWT "offline" message.
I have other MQTT sensors (not Sonoff - they are Arduino-based board with my own firmware) that work correctly. Hence I don't think is the WiFi network.
I tried to change the position and the plug (it is very close to the router, though) but nothing has changed. Instead, connecting the sensor inside my LAN it works fine!
What else could cause this odd behavior?
