Keeping Session keys across reboot

Is there any best practice to persist the Network Session Key and Application Session Key across different power cycle using OTTA?

Saving the NwSKey and AppSKey is not supported by RUI3. Once the device is powered on it assumes that it is not connected and you have to start a Join.

Probably possible is to join once, save the NwSKey and AppSKey in flash, then switch to ABP. But I never tried it.

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