建立服务器套接字 建立客户端套接字 设置等待连接的超时时间-Set up a server socket, to set up the client socket, waiting for the connection timeout setting

1.包括base64加密代码 2.包括 socket的检测 3.数据接收的超时限制，socket发送和接收-1. Includes base64 encryption codes 2. Includes socket timeout limit 3. detecting received data, socket send and receive

socket读写源码，带超时管理(使用select)-Socket read and write source code, with timeout management (using select)