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.

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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.

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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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