Loosened payload size warning and added note about binary warning
Loosened payload size warning and added note about binary warning

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