[router] Start implementing UpAdapter.
[router] Start implementing UpAdapter.

mgranberry/ttn,TheThingsNetwork/ttn,jvanmalder/ttn,LoRaWanSoFa/ttn,mgranberry/ttn,mgranberry/ttn,TheThingsNetwork/ttn,jvanmalder/ttn,LoRaWanSoFa/ttn,jvanmalder/ttn,TheThingsNetwork/ttn