The Unit of Measurement ("tempScale") of the MQTT message is set for each published measurement - but not for the homeassistant discovery.
Thus, openhab (and mabye other systems?) don't recognize the value as "Number" - so it uses String instead. This is somehow annoying when trying to configure the sensor channel to be linked to an existing item in OpenHAB.
(Items that are created automatically or with "Add point to model" can be configured in a way that the String is transformed to Number or Number:Temperature, but existing Items cannot be linked).
When a "Unit of Measurement" is set in HomeAssistant discovery, the HA binding of OpenHAB notices that the MQTT String is a number and automatically converts it.
The BME280 usermod uses a multiply-round-divide approach to cap the temperature/humidity/pressure values to some number of decimals. But the divide-part was missing in a few instances.
Implemented PinManager and rerun setup of usermod after updating pins/
Registered in const.h and pin_manager.h I tried to follow the existing formatting/numbering in these files.
Wrapped any strings I could in F()
Added public variables to the BME280 usermod based on those in the Temperature usermod. Only complication is that this usermod utilises different function calls depending on whether user defines celsius or not. I have handled this for the temperature, but the Dew Point and Heat Index are relative to the temperature.
I've also addressed some areas where I'd previously assumed Celsius for reporting purposes as my test case is using Farenheit.
I added a Usermod interface for key settings. I used a PinArray for the SDA/SCL pins, but you can't name these individually.
I have also made a display to show the temperature/humidity values in the web interface's Info screen.
I had to change the definition of those items in order to allow these new functions to work. I have not noticed any negative side effects to this change.
At the moment, I've not figured out how to make Celsius/Farenheit toggleable due to the way the #define setup works.
Finally, I have added a routine to publish MQTT Discovery Topics for Home Assistant (toggleable in the Usermod screen).
I've been testing this on the only suitable device I have for a few months and haven't noticed any problems.
