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Using multicast (EtherAddMCast, EtherDelMCast,...)

OH
Intellectual 260 points

I have old code using earlier versions of NDK that calls the functions EtherAddMCast, EtherDelMCast and EtherClearMCast.

Writing new code, I want to reuse as much as possible from the old code, but I get "undefined symbol" errors when linking my program.

I can see in the NDK Reference Guide (SPRU524H) that these functions are mentioned in the appendix A, "Internal Stack Funcions", but how do I reach them?

Is there a lib I can link to my program?

Thanks.

 

  • 0
    TI__Mastermind 20480 points

    Hi OH,

    which version of the "old" NDK are you using and can describe your "new code" environment (SYS/BIOS and NDK versions)?

  • 0 in reply to Tom Kopriva
    Intellectual 260 points

    Hi Tom

    The "old" NDK is version 1.8, and the current environment I use is NDK 2.21.something and SYS/BIOS 6.33.something.

    I was hoping I would be able to use a piece of old network code as is, but I as I wrote, the libs I link with doesn't seem to have these functions.

    /OH

  • 0 in reply to OH
    TI__Mastermind 20480 points

    Hi OH,

    these API's go deep into the NDK stack.

    In NDK 2.21, we suggest you to use IGMP (3.6 Internet Group Management Protocol) protocol instead calling the multicast APIs directly.

  • 0 in reply to Tom Kopriva
    Intellectual 260 points

    Ok.

    Reading the "3.6 Internet Group Management Protocol" paragraph I see that uring the "usual" setsockopt is the preferred way of joining a multicast group. This should be a good thing, since then the coude would look vitually identical to the (working) Linux version of the code.

    However, the code doesn't work. The setsockopt call returns with a EINVAL error.

    I'm using INADDR_ANY in the imr_interface field in the ip_mreq. That should work, right? Or do I need to use an actual address when using NDK?

    Do I need to "enable" multicast somwhere during the setup for this call to work?

    /OH

  • 0 in reply to OH
    TI__Mastermind 45025 points

    Hi OH,

    A customer had multicast issues last summer so I thought I'd point you to that thread:

    http://e2e.ti.com/support/embedded/bios/f/355/p/202568/738604.aspx#738604

    I was able to successfully receive multicast packets with the attached code (updated helloWorld.c, see 'mcTask()').

    1323.helloWorld.c

    Steve