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cc3200 tcp server 多次重新连接后不能再连接问题

ls tang
Prodigy 95 points
Other Parts Discussed in Thread: CC3200

我用CC3200模块做TCP SERVER时，只有一个TCP客户端反复断开、连接，大概4次以后无法再连接。分析是达到socket连接限制（因为还有其他套接字），但客户端正常断开后 sl_Recv返回0，我在返回0后有关闭套接字，为什么还会出现这种情况呢，请问是什么问题？

while(1)

{

        // waiting for an app incoming TCP connection        

        if ( g_iSockID_App < 0 )

        {

               // accepts a connection form a TCP client, if there is any            

               // otherwise returns SL_EAGAIN          

               g_iSockID_App = sl_Accept(g_iSockID_AppServer, ( struct SlSockAddr_t *)&sAddr, (SlSocklen_t*)&iAddrSize);

                if (g_iSockID_App == SL_EAGAIN)

               {                

                   //sl_Close(g_iSockID_App);

               }        

               else if(g_iSockID_App < 0)

               {                

                      // error

                     sl_Close(g_iSockID_App);

               }

              else

              {

                     // setting socket option to make the socket as non blocking

                     enableOption.NonblockingEnabled = 1; //0 = disabled;1 = enabled;default = 1

                     lRetVal = sl_SetSockOpt(g_iSockID_App,SL_SOL_SOCKET,SL_SO_NONBLOCKING, (_u8 *)&enableOption,sizeof(enableOption));

                     //enable/disable nonblocking mode

                     if( lRetVal < 0 )

                     {

                           sl_Close(g_iSockID_App);

                     }

              }

    }

    else

    {

             // waits for 1 packets from the connected TCP client

             lRetVal = sl_Recv(g_iSockID_App, g_cAppTcpBuf, TCP_CMD_RD_BUF_SIZE, 0);

             if (lRetVal == SL_EAGAIN);

             else if(lRetVal <=0)

             {

                     // error

                     sl_Close(g_iSockID_App);

                     g_iSockID_App=SL_EAGAIN;

                      //如果客户端正常断开的返回值为0

                    UART_PRINT("App client failed,lRetVal=%d\n\r",lRetVal);

             }

             else

             {

                       //run command

             }

       }

}

  • 0
    TI__Mastermind 20826 points

    请问能否查一下当client端关闭socket, 再连接的时候，你的sl_Accept返回的socket no是不是在递增？

    你客户端关闭的时候是怎样关闭的呢？

  • 0 回复 Yonghua Pan
    Prodigy 90 points

    我将 BsdTcpServer（）函数嵌套在while（1）中，链接PC上网络调试助手TCP client类型，第一次链接成功，断开再次链接，在接受tcp链接函数  sl_Accep报错，这个怎么解决啊！

  • 0 回复 ss sh
    TI__Mastermind 20826 points

    void TcpServerMultiClient(int usPort)
    {
    int serverID, socketID[7] = {-1, -1, -1, -1, -1, -1, -1};
    long lNonBlocking = 1;

    SlSockAddrIn_t sAddr;
    SlSockAddrIn_t sLocalAddr;
    struct SlTimeval_t timeVal;
    int iAddrSize;
    int iStatus;
    int iNewSockID;
    int i, Ret;

    char buffer[1024];

    sLocalAddr.sin_family = SL_AF_INET;
    sLocalAddr.sin_port = sl_Htons((unsigned short)usPort);
    sLocalAddr.sin_addr.s_addr = 0;

    timeVal.tv_sec = 0;
    timeVal.tv_usec = 0;

    serverID = sl_Socket(SL_AF_INET,SL_SOCK_STREAM, 0);

    if(serverID < 0)
    {
    printf("Create TCP server socket failed\r\n");
    return;
    }

    iAddrSize = sizeof(SlSockAddrIn_t);

    // binding the TCP socket to the TCP server address
    iStatus = sl_Bind(serverID, (SlSockAddr_t *)&sLocalAddr, iAddrSize);
    if( iStatus < 0 )
    {
    sl_Close(serverID);
    // error
    printf("Bind TCP server socket failed\r\n");
    return;
    }

    // putting the socket for listening to the incoming TCP connection
    iStatus = sl_Listen(serverID, 0);
    if( iStatus < 0 )
    {
    sl_Close(serverID);
    printf("Listen TCP server socket failed\r\n");
    return;
    }
    printf("TCP Server Listening...\n\r");

    // setting socket option to make the socket as non blocking
    iStatus = sl_SetSockOpt(serverID, SL_SOL_SOCKET, SL_SO_NONBLOCKING,
    &lNonBlocking, sizeof(lNonBlocking));
    if( iStatus < 0 )
    {
    printf("set socket TCP server socket failed\r\n");
    sl_Close(serverID);
    return;
    }

    sl_SetSockOpt(serverID,SOL_SOCKET,SL_SO_RCVTIMEO, &timeVal, sizeof(timeVal));

    //serverID = SL_EAGAIN;

    while(1)
    {
    for(i = 0; i < 7; i ++)
    {
    if(socketID[i] < 0)
    {
    if( (socketID[i] = sl_Accept(serverID, ( struct SlSockAddr_t *)&sAddr, (SlSocklen_t*)&iAddrSize)) >= 0)
    {
    printf("Got a connection, socket id:%d\r\n", socketID[i]);
    iStatus = sl_SetSockOpt(socketID[i], SL_SOL_SOCKET, SL_SO_NONBLOCKING,
    &lNonBlocking, sizeof(lNonBlocking));

    sl_SetSockOpt(socketID[i],SOL_SOCKET,SL_SO_RCVTIMEO, &timeVal, sizeof(timeVal));
    }
    }
    //printf("socket id:%d\r\n", socketID[i]);
    if(socketID[i] > 0)
    {
    //printf("socket id:%d--i:%d\r\n", socketID[i], i);

    Ret = sl_Recv(socketID[i], buffer, 1024, 0);

    if(Ret > 0)
    {
    buffer[Ret] = '\0';
    printf("Received packets:%s\r\n", buffer);
    }
    //else
    // printf("Returned value:%d\r\n", Ret);
    }
    }
    }
    }

  • 0 回复 ss sh
    TI__Mastermind 20826 points

    我贴了一段代码给你，这是支持多次连接的，你可以参考一下。在你的客户端关闭链接后，请注意要通知你的服务器端关闭套接字。CC3200没有能力知道套接字现在有没有断。