该协议采用UDP方式接入服务器，图中req表示请求数据包，res表示应答数据包。当设备上线时发送hello数据包给服务器，服务器检查数据的合法性，如果是非法请求，服务器将不作响应。设备收到应答数据后将发出refresh更新数据包，服务器同样先检查数据-The agreement means the use of UDP access server, the figure said req request packet, res that the response packet. When the device when sending data outsourcing hello server, the server checks the legitimacy of data, if it is illegal request, the server will not be responding to. Equipment will receive the response data packet sent refresh update, the server to check the same data