[LAD] Question: broadcasting OSC messages

[Fons Adriaensen]

On Mon, Mar 30, 2009 at 12:38:38AM +0200, Pau Arumí wrote:

> But in my case I have multiple processes in the same computer that
> listens the same source (another process also in the same computer). If
> I understand well multicast, it does not help in my situation, right?

If your destination processes are just waiting for
commands without creating a permantent connection to
the source of these commands (in other words. they
are UDP receivers) then multicast is the way to go.
Instead of listining on a normal IP address the
receivers should join a multicast group. Liblo
does provide this AFAIK. Such a receiver is still
a 'server', which is somewhat misleading.

When creating a multicast socket you normally need
to provide not only the multicast IP address and 
port but also an interface address. Liblo seems
to use INADDR_ANY for this in its multicast receiver,
which is rather strange.

AFAICS liblo does not provide a way to create a multicast
sender. Strangely there is a IP_MULTICAST_TTL option set,
but no I've found no IP_MULTICAST_IF option which would
be required in a sender.

Ciao,

-- 
FA

Io lo dico sempre: l'Italia è troppo stretta e lunga.