Added & updated error messages when using incompatible shield (firmware)

Fix bug where some L76 messages are ignored due to the checksum being one digit long (i.e. 'F') vs. the expected 2 digit length ('0F')

* Spot when pressure sensor has stalled and reset it.

* Add lux calculation to LTR329ALS sensor

* Fix division-by-zero bug in the lux() calculation

* Add methods to control the heater in the SI7006 temp/humidity sensor.

* Add lux reading in Pysense 2 example

Co-authored-by: Adrian McEwen <[email protected]>

Fix for https://forum.pycom.io/topic/6981/pyscan-nfc-rfid-reading-issue/

Decoding a NFC card would previously return all 0's because of this bug. Instead of returning the data, we would return the length, which would make the following function calls print all 0's instead of the decoded data.

I was not able to test this personally because of a lack of decodable keycards

fix broken link

* Create readme.md

* for reference only

* partition -> part

It seems there is a rare chance to end up with a frozen device at the point where the lora=LoRa() object is recreated. There is no real need to do this inside pymesh_config, so as a workaround we simply make one object only and pass the lora_mac