[LoRaWAN] Improve persistence behaviour, add dwell time error, clear up debug output (#980)
* [LoRaWAN] Improve examples, add getter for DevAddr
* [ArduinoHAL] Only (over)write new values
* [HAL] Fix comment
* [TypeDef] Introduce error for LoRaWAN dwell time
* [LoRaWAN] Improve persistence behaviour, add dwell time error, clear up debug output
* [LoRaWAN] Prevent incorrect behaviour in restore()
* [LoRaWAN] Improve example comments and persistence
* [LoRaWAN] Fix DeviceTime and LinkCheck, fix FcntUp offset
* [LoRaWAN] Fix example incorrectly processing MAC commands
* [LoRaWAN] Fix downlink port, Fcnt 'underflow', user MAC processing
* [LoRaWAN] Add simple receive methods
* [LoRaWAN] Add co-author
Co-Authored-By: HeadBoffin <60431281+HeadBoffin@users.noreply.github.com>
* [LoRaWAN] Fix example output
* [LoRaWAN] Improve persistence behaviour, bugfix subband
* [LoRaWAN] Prevent useless rejoin during nonpersistent session
* [LoRaWAN] Graciously block an uplink if not joined
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Co-authored-by: HeadBoffin <60431281+HeadBoffin@users.noreply.github.com>
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