I have recently purchased the MQTT relay and setup the Wifi. All connectivity and NTP is working fine. I can control the relay via the web interface.
At first the unit would not connect to my MQTT broker (running on emonpi) so I couldn’t set/get the relay value via MQTT. I have flashed the firmware to v3190 and the MQTT integration is now working
However the onboard DB18B20 does not seem to be working (either before or after the firmware upgrade). The thermostat control page shows NaN and no temperature values are reported via MQTT.
I have enabled the DB18B20 and tried all of the “pin” settings but to no avail.
I see someone else had a similar problem here : No reading on DS18B20 on WiFi MQTT relay