sock_fd = socket(AF_INET, SOCK_STREAM, 0)) //AF_INT:ipv4, SOCK_STREAM:tcp协议
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bind(sockfd,(struct sockaddr*)&serveraddr,sizeof(serveraddr))
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int listen(int s, int backlog)
1.

int accept(s, addr, addrlen)    
1.

int recv( SOCKET s, char *buf, int  len, int flags)   
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int send( SOCKET s,char *buf,int len,int flags )
1.

static void TCPServerTask(void)
{
	/* 服务端地址信息 */
	struct sockaddr_in server_sock;
	/* 客户端地址信息 */
	struct sockaddr_in client_sock;
	int sin_size;

	struct sockaddr_in *cli_addr;
    /* 连接Wifi */
    WifiConnect("TP-LINK_65A8","0987654321");


    /**
    * 1.创建socket
    * AF_INET:ipv4
    * SOCK_STRAM:tcp协议
    */
	if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("socket is error\r\n");
		exit(1);
	}

	bzero(&server_sock,sizeof(server_sock));
	server_sock.sin_family = AF_INET;
	server_sock.sin_addr.s_addr = htonl(INADDR_ANY);
	server_sock.sin_port = htons(_PROT_);

	/*2.调用bind函数绑定socket和地址*/
	if(bind(sock_fd, (struct sockaddr *)&server_sock, sizeof(struct sockaddr)) == -1)
	{
		perror("bind is error\r\n");
		exit(1);
	}

	/**
 	* 3:调用listen函数监听(指定port监听)
	* 通知操作系统区接受来自客户端链接请求
	* 第二个参数：指定队列长度
	*/
	if(listen(sock_fd, TCP_BACKLOG) == -1)
	{
		perror("listen is error\r\n");
		exit(1);
	}

	printf("start accept\n");

    /**
    * 4：调用accept函数从队列中
    * 获得一个客户端的请求链接
    */
	while(1)
	{
		sin_size = sizeof(struct sockaddr_in);

		if((new_fd = accept(sock_fd, (struct sockaddr *)&client_sock, (socklen_t *)&sin_size)) == -1)
		{
			perror("accept");
			continue;
		}

		cli_addr = malloc(sizeof(struct sockaddr));

		printf("accept addr\r\n");

		if(cli_addr != NULL)
		{
			memcpy(cli_addr, &client_sock, sizeof(struct sockaddr));
		}

		//处理目标
		ssize_t ret;		

		while(1)
		{
			if((ret = recv(new_fd, recvbuf, sizeof(recvbuf), 0)) == -1)
			{
				printf("recv error \r\n");				
			}
			printf("recv :%s\r\n",recvbuf);
			sleep(2);
			if((ret = send(new_fd, buf, strlen(buf) + 1, 0)) == -1)
			{
				perror("send : ");
			}

			sleep(2);
		}	

		close(new_fd);

	}
}
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#"D1_iot_wifi_sta:wifi_sta",
#"D2_iot_wifi_sta_connect:wifi_sta_connect",      
#"D3_iot_udp_client:udp_client",
"D4_iot_tcp_server:tcp_server",
#"D5_iot_mqtt:iot_mqtt",        
#"D6_iot_cloud_oc:oc_mqtt",
#"D7_iot_cloud_onenet:onenet_mqtt",
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g_connected: 1
netifapi_dhcp_start: 0
server :
        server_id : 192.168.0.1
        mask : 255.255.255.0, 1
        gw : 192.168.0.1
        T0 : 7200
        T1 : 3600
        T2 : 6300
clients <1> :
        mac_idx mac             addr            state   lease   tries   rto     
        0       181131a48f7a    192.168.0.164   10      0       1       2       
netifapi_netif_common: 0
start accept
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start accept
accept addr
recv :Hello! BearPi-HM_nano TCP Server!
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