[router] Split listenAndSend in two for farther needs
[router] Split listenAndSend in two for farther needs

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