Hi @Mate_Eke,
could you post some more data from openmqttgateway as above, but with temperatures for both probes as shown in the Tuya Smart app at the same time?
This allows us to see where and how the temperatures are encoded in the transmitted data.
Tuya smart uses connected mode, the device is invisible for openmqttgateway if it’s connected with the Tuya smart app. If it’s disconnected from the app I only see the above data in openmqttgateway output.
Here are some screenshots from nrf connect while connected:
Thanks, the new first nRF Connect screenshot has exactly the same manufacturerdata and servicedata as the one above and the OpenMQTTGateway data.
So it seem the Grillmeister doesn’t transmit its temperatures freely in the two data broadcasts, but - as you confirmed above with the Tuya app - requires a connection to fetch the temperature information.
Unless the freely broadcast data OpenMQTTGateway receives changes with the temperatures unfortunately this is currently out of the scope of OpenMQTTGateway to include and decode this Bluetooth BBQ thermometer 
Should it still be possible to get values from a Meater probe? I tried it with the latest development branch and was not able to get anything other than the Info that the device is a Meater probe.
{
"id": "B8:1F:5E:54:22:C6",
"name": "MEATER",
"rssi": -66,
"distance": 2.246586
}