BL602&BL604 TCP SERVER

在上一节我们成功实现了模块作为TCP client接入到TCP server实现通讯，这节我们来实现模块作为TCP server,让其他TCP client接入实现通讯。

例程地址：

https://github.com/SmartArduino/Doiting_BL/tree/master/examples/WIFI_SERVER

在前面实现wif连接的基础上，在wifi连接成功后创建TCPserver任务。

//TCP server任务
static void tcp_server(void *arg)
{
    char databuff[512];
    uint8_t *recv_data;
    uint32_t sin_size;
    int sock = -1, connected, bytes_received;
    struct sockaddr_in server_addr, client_addr;
    char *host = (char*)arg;

    LOGE(TAG," start  tcp_server ");
    recv_data = (uint8_t *)pvPortMalloc(IPERF_BUFSZ);
    if (recv_data == NULL)
    {
        LOGE(TAG,"No memory");
        goto __exit;
    }

    (void) host;
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
        LOGE(TAG,"Socket error");
        goto __exit;
    }

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(IPERF_PORT);
    server_addr.sin_addr.s_addr = INADDR_ANY;//INADDR_ANY;
    memset(&(server_addr.sin_zero), 0x0, sizeof(server_addr.sin_zero));

    if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1) {
        LOGE(TAG,"Unable to bind");
        goto __exit;
    }

    if (listen(sock, 5) == -1) {
        LOGE(TAG,"Listen error");
        goto __exit;
    }

    while (1) {
        sin_size = sizeof(struct sockaddr_in);

        connected = accept(sock, (struct sockaddr *)&client_addr, (socklen_t *)&sin_size);
        LOGI(TAG,"new client connected from (%s, %d)",
                  inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));

        {
            int flag = 1;

            setsockopt(connected,
                IPPROTO_TCP,     /* set option at TCP level */
                TCP_NODELAY,     /* name of option */
                (void *) &flag,  /* the cast is historical cruft */
                sizeof(int));    /* length of option value */

        }
        while (1) {
            
            memset(databuff, 0x00, sizeof(databuff));
            bytes_received= recv(connected, databuff, sizeof(databuff), 0);
            if (bytes_received <= 0) break;
            send(connected, databuff, strlen(databuff), 0);//将接收到的消息发送回客户端
            LOGE(TAG, "recv: %s", databuff);

        }

        if (connected >= 0) closesocket(connected);
        connected = -1;
    }

__exit:
    if (sock >= 0) closesocket(sock);
    if (recv_data) vPortFree(recv_data);
    if (arg) vPortFree(arg);
}

void wifi_event_handler(wifi_event_indicate_t event){
    switch (event)
    {
        case WIFI_EVENT_CONNECT:
            LOGE(TAG, "wifi_connect");
    //WIFI连接成功创建TCP server 任务
    if (!tcpc_task_handle) {
    if (xTaskCreate(tcp_server, "tcp_server", TCPC_TASK_SIZE, NULL, 2, &tcpc_task_handle) != pdPASS) {
            LOGE(TAG, "create tcp_server fail");
        }
    }
    
            break;
        case WIFI_EVENT_DISCONNECT:
            LOGE(TAG, "wifi_disconnect");
            break;
        default:
            LOGE(TAG, "wifi_event: %d",event);
            break;
    }
}

编译好程序后，将固件烧录到模块后复位，观察串口输出，当连接上wifi后，用TCP测试工具建立TCP client连接。

创建成功后点击连接，连接成功后串口会输出该连接的IP和端口