void vLANcommunication( void *pvParameters )

{

    int32    listenfd;

    do{

        listenfd = socket(AF_INET, SOCK_DGRAM, );

        if(listenfd    ==    -)

        {

            debug("ESP8266 UDP server task > socket error\n");

            vTaskDelay(/portTICK_RATE_MS);

        }

    }while(listenfd    ==    -);

    debug("---------------UDP server task > socket ok\n");

    struct    sockaddr_in    server_addr;

    memset(&server_addr, , sizeof(server_addr));/*    Zero out structure */

    server_addr.sin_family    = AF_INET;    /*    Internet address family，AF_INET表示IPv4*/

    server_addr.sin_addr.s_addr    = INADDR_ANY;

    server_addr.sin_len    = sizeof(server_addr);

    server_addr.sin_port = htons();    /* Local port */

    int32 ret;

    do{

        ret    = bind(listenfd, (struct sockaddr *)&server_addr, sizeof(server_addr));

        if    (ret !=    )

        {

            debug("ESP8266    UDP server task > bind fail: %d\n",ret);

            vTaskDelay(/portTICK_RATE_MS);

        }

    }while(ret != );

    debug("---------------UDP server task > bind ok\n");

    u8 *recv_buf = (u8 *)zalloc( * sizeof(u8));

    int32 len = sizeof(struct sockaddr_in);

    struct    sockaddr_in    remote_addr;

    int32 recbytes;

    u16 i;

    u8 tmp_index;

    u8 udp_RxBuf[];//单条命令不能超过50字节

    u8 udp_RxBuf_index = ;

    u8 udp_package_length;

    u16 cmd;

    for(;;)

    {  //缓存的数据需要一次性读出来，否则余下的数据读取不到

        recbytes = recvfrom(listenfd, recv_buf, , , (struct sockaddr *)&remote_addr, (socklen_t *)&len);
sendto(listenfd, recv_buf, recbytes, 0, (struct sockaddr *)&remote_addr, len);// debug("receive a UDP package\n");

    }

}