OTAA shows "Activation DevNonce not valid: already used"

TTN Network and Services v2 Backend
2

  • The good news: If the console shows the error, at least we can be sure that you registered your device correctly, so no problems there.

  • The bad news: it seems your device does not follow the LoRaWAN specification. When a device joins, it must use a unique DevNonce (usually random works fine). When it uses a DevNonce that was already used before, you see the error “Activation DevNonce not valid: already used”. I recommend you to check the firmware of your device, as this will probably be the problem. As the Handler keeps a list of used DevNonces, deleting and re-registering the device might also work (but it’s not a solution to the underlying problem).