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How to catch the moment when NDK has received data from TCP or UDP socket?

Vitalii Kukush
Intellectual 830 points

Dear e2e community!

I use NDK socet API for connection to a TCP/IP server. After connect(), I need to receive data from server.

Can I declare a callback function, which will be called after the data from TCP/IP server is received?

If yes, how can i do it?

I understand, I can call recv(SOCKET s, void *pbuf, int size, int flags); or recvfrom(SOCKET s, void *pbuf, int size, int flags, PSA pName, int *plen); with flags = MSG_WAITALL or MSG_DONTWAIT. But it will "hang" my task (with flags = MSG_WAITALL ) or I must periodically call recv with  flags = MSG_DONTWAIT. Could You suggest any alternative method?

My platform:TMS320C6747EVM (OMAPL137EVM);  CCS3.3; NDK2.0.0; DSP/BIOS 5.33.01;

 

Thank You in advance,

Vitalii

  • 0
    TI__Genius 10260 points

    Hi Vitalii,

    recv and recvfrom are part of the TCP/IP stack standard.  Callbacks cannot be hooked into the stack to handle cases where information is received.

    Vitalii Kukush said:

     or I must periodically call recv with  flags = MSG_DONTWAIT. Could You suggest any alternative method?

    It is a common practice to not block waiting for data.  This approach will require that your application be able to handle situations where the data is not received all at once (maintain a data buffer and count of bytes received, etc).

    Thanks,

    -- Emmanuel