Added default temperature from ESP32 MCU and NRF52 MCU

[IoTThinks]

I have cleaned up and creating a new PR to to display default temperature to all ESP32 and NRF52 boards.

• Added default temperature from ESP32 MCU and NRF52 MCU
• Added NRF52Board.h and NRF52Board.cpp
• Modified NRF52 variants to extend from NRF52Board to share common feature

Old PR is here: #1163.
Thanks a lot.

[liamcottle]

Looks good thanks!

My last comment is on the behaviour of boards that have an external temperature sensor installed as well.

We would now be using TELEM_CHANNEL_SELF for both the internal mcu temperature sensor, and any external temperature sensors.

https://github.com/meshcore-dev/MeshCore/blob/2deb9cf1440a658c0b51cb824c6582eed7fb87f1/examples/simple_repeater/MyMesh.cpp#L179C32-L179C50

MeshCore/src/helpers/sensors/EnvironmentSensorManager.cpp

Line 362 in 922e378

telemetry.addTemperature(TELEM_CHANNEL_SELF, BME280.readTemperature());

Wondering if this will cause any issues, and if so, which one takes priority unless we move external sensors to a separate channel.

[IoTThinks]

I suggest to move the telemetry of external sensors to Channel 2.

That would be clean and clear.

What do you think?

[IoTThinks]

From some friends, the later Temperature will override and take priority.

[IoTThinks]

@liamcottle I managed to add a BME680 to a Heltec repeater.

This is from built-in sensor.

This is when we add BME680.
Yes, because we add the temperature of MCU before BME680.
The temperature of BME680 will override the temperature of MCU.

So the PR is quite safe.

[liamcottle]

Great thanks, I'm happy with the default MCU temp sensor being overriden by the external sensors for now.

We can look to move external sensors to a separate channel in a future PR if that is preferred.

I like the idea of external sensors on a separate channel than "self", but to keep this PR minimal without a breaking change for existing users, let keep it as is.

Looks good to me :)

[fizzyfuzzle]

@IoTThinks I just flashed the nightly (18-Dec-2025 02:08) to a WisMesh Tag and a t114, but I can not see the temperature in the telemetrics on the mobile app? Is there something additional I need to do to enable this feature? Thanks

Edit:
Ah I see this is only available in the Repeater Telemetrics, is there a reason for this? Would also be nice to have it in the companions I guess?