[PD] UDP server with Pd

[Miller Puckette]

One solution (which the conniption server/client and quacktrip both
use in somewhat different ways) is for a "netreceive" object to wait
for an incoming connection and then, once one arrives, immediately to close
its own listening port and for a "nestsend" in the same patch to open
a connection to the IP and port that the "netreceive" reported (via its
second outlet).  It's a bit complicated but gets the job done.

cheers
Miller

On Wed, Jun 02, 2021 at 12:06:28AM +0200, Christof Ressi wrote:
> > While we're at it, it seems [netreceive] (in TCP mode) can only send
> > back to all connected clients, but not to a specific one.
> Actually, a [sendto( message for [netreceive] would already allow you to
> build a fully functional UDP server in Pd vanilla.
> 
> BTW, there is a [udpserver] object in iemnet, but it's not really usable yet
> (it only allows to send messages to the last sender).
> 
> Christof
> 
> On 01.06.2021 22:55, Roman Haefeli wrote:
> > Hey all
> > 
> > I would like to open a datagram listening socket and be able to send
> > back to clients from which I received messages. It seems both [netsend
> > -u] and (obviously) [netreceive -u] actually can open a listening
> > socket. However, [netreceive -u] can't send anything back. While
> > [netsend -u] can send messages back, it doesn't show the source address
> > of the incoming packets. And using [netreceive -u] for receiving and
> > [netsend -u] for sending back doesn't work, because for the packets to
> > arrive at the client, they need to be sent from the same port that is
> > already occupied by [netreceive].
> > 
> > Yet, as long as I used TCP and iemnet, this was possible. However, as
> > far as I can tell, it's not possible with UDP, neither with iemnet nor
> > with Pd's built-in classes.
> > 
> > Is that something worth to make a feature request for?
> > 
> > While we're at it, it seems [netreceive] (in TCP mode) can only send
> > back to all connected clients, but not to a specific one.
> > 
> > Roman
> > 
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