Hi Martin, 

thanks for that, 
but I don't know how many clients there are
so it's quite difficult to figure out port number in this case.

My problem is that I can't listen several time on the same port with [udpreceive] but with multicasting, that's why I switched to [udpserver].

thanks

a

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2013/7/2 Martin Peach <martin.peach@sympatico.ca>
On 2013-07-02 14:38, Antoine Villeret wrote:
all of this is quite complex for a not so difficult task : I want to
make several instance of Pd talking to each other on one machine

I started with udpsend/udpreceive but I found no way to do broadcast on
localhost and I do need to have lots of clients

You don't need to broadcast on a single machine, just use different port numbers. You can send to several ports with several [udpsend]s.

Martin