Multicast communication issue

Discussion in 'Windows Networking' started by alessandro.strazzero@gmail.com, Aug 12, 2011.

  1. Guest

    Hi all,

    I have a problem using multicast communication on Windows CE 5.0. I
    don't really know if
    I'm trying to do something wrong for the concept of multicast, or the
    OS has a bug. I hope
    someone can suggest me the right way to proceed, because I'm locked on
    this issue.

    I have implemented a very simple protocol. Every host on the network
    can receive
    something from another host and can send something to other hosts
    using the multicast
    group "239.0.0.104" - port 65000. There is no concept of client/server
    in this protocol. A
    host can send the own information without have received anything and
    the same host can
    receive information without have sent anything. The send/receive
    operations are
    completely asynchronous and independent one from the other. Sometimes
    the host can
    first send and then receive and vice versa.

    Well, I have tried different way of implementation of this protocol. I
    have used the "one
    socket implementation" and also the "two sockets implementation (one
    for sending, the
    other for receiving)". Wathever I do, the result is always the same,
    that is the software
    does not transmit if the multicast address has been joined and nothing
    has been
    received. It always transmits every time one packet has been received.

    My idea is that joining the multicast address the TCP/IP stack always
    acts as a UDP
    server and transmits only if has received a packet. I have not found
    any option to set
    up the sockets in such a way to workaround this behaviour. But, maybe
    I'm wrong in
    my opinions and the solution is on the "dark side of the moon".

    Everything suggested is very appreciated.

    Best regards

    /Alessandro
     
    , Aug 12, 2011
    #1
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