lwip中server和client的socket、地址和端口号

1、server的socket通过lwip_socket建立：

server_sd = lwip_socket(AF_INET, SOCK_STREAM, 0);

2、client的socket在监听到连接后建立：

client_sd = lwip_accept(server_sd, (struct sockaddr *)&client_addr_port, (socklen_t *)&size);

3、server的IP地址和端口号server_addr_port：

先赋值：

server_addr_port.sin_family = AF_INET;//IPV4
server_addr_port.sin_port = htons(TCP_CMD_PORT);//7
server_addr_port.sin_addr.s_addr = INADDR_ANY;//0.0.0.0

再绑定：

lwip_bind(listen_sd, (struct sockaddr *)&server_addr_port, sizeof(server_addr_port);

4、client的IP地址和端口号client_addr_port：

client_sd = lwip_accept(server_sd, (struct sockaddr *)&client_addr_port, (socklen_t *)&size);