Missing DevEUI set

[disk91]

There is no reason why the DEVEUI is static and can't be change, this is a really old understanding of LoRaWAN and it makes non sense today. devEUI and appEUI a better generated randomly and pre-commissioned by the LNS before the device physical creation, also, it's better to have the ability to replace a device by another transparently in case of maintenance.
For all these reasons, having a firmware not allowing to change the devEUI is a real problem.

I encourage to fix this and allo get & set on devEUI.