[PD] help needed: broadcast mode netsend(~) over UDP (from Mac OSX)

[Nicholas Mariette]

hi,

Can anyone advise on whether it's possible to do UDP broadcast (e.g.  
to 255.255.255.255 or more limited IP ranges) from netsend~ (by Olaf  
Matthes), or even netsend or other network objects?

I've tried this and have not had any luck.
I get this error:
"connecting stream socket: Permission denied (13)"

I then looked at the code of netsend~.
I'm using an updated version available (with source) at:
http://www.remu.fr/sound-delta/netsend~/

After some googling around about the (13) error, I tried setting  
SO_BROADCAST, which it seems might be necessary to enable broadcast  
mode.
This didn't help - I still get the permission denied message.

I have then tried several other network objects, like netsend (control  
data version), and have had no luck.
If I could get any of these going in broadcast mode, I might be able  
to modify code to make something work.

I've found some Pd list posts about broadcast working, but haven't  
been able to duplicate these results.
e.g.
http://markmail.org/thread/6bjcfzblukbynchp

I've been working on a simple 192.168.x.x network between 2 computers,  
with direct message sending working without problems.

I think I'm stuck for further ideas to get broadcast working...

Can anyone suggest a solution - or even a next move?!

cheers
Nick