프로토콜 측면에서 MQTT(Message Queue Telemetry Transport), CoAP(Constrained Ap-plication Protocol), XMPP(eXtensible Messaging and Presence Protocol), HTTP, Websockets 등 다양한 전송기술들을 고려하였다.
In terms of protocol, various transmission technologies were considered, including MQTT (Message Queue Telemetry Transport), CoAP(Constrained Application Protocol), XMPP (eXtensible Messaging and Presence Protocol), HTTP, and Websockets.