Persist LoRaWAN keys after OTAA join about esp32-paxcounter HOT 7 CLOSED

To reduce write wearing only persist counters every n packages and when rejoining just add n to the counter. This way the join works and the network still accepts the packages and regard the counter difference as package loss.

n should depend on send interval.

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Could be a way. Another, maybe more straight forward way, would be to create/open a separare, second partition in NVRAM and store it there.

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I am currently looking into this since I could need this in another project also. Do you suggest storing the data in the configdata_t struct? I'd check for set parameters on reboot and using them if available.

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I have to dig into the storing mechanism a bit more. Your suggestion sounds more feasible – from what I've interpreted so far, saving the data would always mean storing all the variables. Since seqnoDn and seqnoUp need to be saved on every package, that might wear out the nvram rather quickly.

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This lib could / should be useful here:
https://github.com/espressif/arduino-esp32/blob/master/libraries/Preferences/src/Preferences.h

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Example how to save keys in RTC RAM of ESP32 while deep sleep:

manuelbl/ttn-esp32#15

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RTC RAM save keys is now implemented.

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