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Re: [lwip-users] RE: Multicast destination address in UDP callback?


From: Simon Goldschmidt
Subject: Re: [lwip-users] RE: Multicast destination address in UDP callback?
Date: Fri, 30 Apr 2010 08:12:36 +0200

Joe Dupre wrote:
> > I have set up a UDP PCB where I listen to several multicast groups.
> > In my UDP callback I'd like to know which multicast group the packet
> > was sent to.
> > How do I determine this?

Use ip_current_header() to get the IP header of the current packet while you 
are inside your recv-callback function. Using pbuf_header() might or might work 
but is not the correct way to do this.

Simon
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