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Original question:

How do I set the socket options to listen to a Multicast group?

CC3100: IP addresses for multicast

Clemens Bittmann
Prodigy 20 points

Part Number: CC3100

Dear all,

I am implementing an IP multicast receiver using a CC3100 (sender is a Windows Qt application). Thanks to the parent thread ("How do I set the socket options to listen to a Multicast group?") I have got it working quickly.

But: I have discovered that it is only working with IP addresses 224.0.0.251 and 224.0.0.252. I have tested several other addresses, different routers (and the firewall was turned off, too) without any success.

Is this a restriction of the CC3100 or do you have any idea, what I am doing wrong?

Thank you very much!
Clemens

  • 0
    TI__Guru 63006 points

    Hi Clemens,

    I don't think the limitation is on the CC3100 side.

    IT is probably your router or firewall that reject the other addresses.

     224.0.0.251 and 224.0.0.252 are known (reserved) addresses (see link below) so they are probably open for use,

    https://en.wikipedia.org/wiki/Multicast_address

    Br,

    Kobi

  • 0 in reply to Kobi Leibovitch
    Prodigy 20 points

    Hi Kobi,

    Thanks for your reply and you are right, the limitation is not on the CC3100 side.

    I did a lot of tests with three different routers and got the same results every time. Finally I compiled the application for Linux (thanks Qt!) and - it works!

    So Windows 7 seems to block most of the multicast messages. I don't know yet why, Windows Firewall and the virus scanner are turned off. I keep on looking and will post again if I find the reason.

    Thanks again!
    Clemens