[broker] Implement Adapter interface with broadcast
[broker] Implement Adapter interface with broadcast

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