[broker] Make router compliant to send signature
[broker] Make router compliant to send signature

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