After the first C3 ‘failures’, since my sensors are in a remote location and often the C3 would hang instead of rebooting, I soon switched back to a ‘vanilla’ ESP32, as documented briefly here
According to pvvx research (who is using lab equipment to test the sensor consumption) there’s an issue in the ESP32 family that prevents low power communication, and so actively connecting even infrequently will cause an abnormal load on the battery,
That’s not a great issue of course (I can just disable adaptive scanning) but I think it’s something to consider given that there’s the risk of adaptive scanning (in its default config) to drain the sensors.
Of course I’ll do more research and keep you updated