> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Herbert Graf
> Sent: 10 January 2006 17:17
> To: Microcontroller discussion list - Public.
> Subject: RE: [EE] Receiving broadcast UDP packets
> 
> On Tue, 2006-01-10 at 16:21 +0000, Peter Onion wrote:
> >  > I've set SO_BROADCAST with set_sockopt but it didn't improve things.
> >
> > I think that only applies to sending to the broadcast address.
> 
> Hmm, see, there was some conflicting information on that. Some man pages
> send it was for reception and transmission, others just for
> transmission. Thanks for the clearing that one up!
> 
> > > Is there a trick to enabling the reception of broadcast packets?
> >
> > Set the bind address to INADDR_BROADCAST
> >
> > 	Name.sin_family = AF_INET;
> > 	Name.sin_addr.s_addr = INADDR_BROADCAST;
> > 	Name.sin_port = htons(potrNumber);
> >
> > 	Bind(rxSocket,(struct sockaddr *) &Name,sizeof(name));
> 
> Hmm, odd, that's the last thing I tried, to no avail. Is it possible
> that INADDR_BROADCAST only responds to certain broadcast addresses, i.e.
> 192.168.1.255 but NOT 255.255.255.255?

Yes I think that's right (and what I would expect).

If your device is really sending to 255.255.255.255 I think it is
misconfigured !  It SHOULD be sending to the broadcast address for the
subnet to which it belongs (i.e. 192.168.1.255) ! 

I'm not sure that 255.255.255.255 is even a valid broadcast address ?

> 
> Have you seen a small example that you were able to get working?

I don't have a "small example", but that code was taken from a working
application that uses broadcast udp packets to find other versions of it
self running on the local network.

Peter 
 



> Thanks for the help. TTYL
> 
> -----------------------------
> Herbert's PIC Stuff:
> http://repatch.dyndns.org:8383/pic_stuff/
> 
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist