Creates a device from its two 8-byte EUIs and its 16-byte application key.
Turns the join accept a network sent into the settings it grants.
devNonce is the nonce the matching join request carried.
Builds the join request this device broadcasts to activate.
devNonce must never repeat for a device, since the network rejects a
replayed one.
The root credentials over-the-air activation is built on.