通过切换命令码的状态，系统可分别工作在信标和应答状态下。
Switching the state by the order code, the system can be in the state of beacon or response.
客户端和服务器端建立连接以后，客户端向服务器端发送命令，服务器端则返回应答。
After the connection between the client and the server is established, the client transmits a command to the server, which will return a response.
连接建立以后，由客户端向服务器端发送命令，服务器端必须对接收到的每一条命令返回一条应答消息。
After the connection is established, the client sends commands to the server, which must return a responding message to each command it receives.
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