[PD] UDP server with Pd

Martin Peach chakekatzil at gmail.com
Wed Jun 2 01:19:30 CEST 2021

The mrpeach [udpsend] outputs its ip and port on the second outlet on
'connect', while the[ [udpreceive] object outputs the ip and port of
each received datagram, so using both you should be able to do what
you want.
A [udpsend] normally has a different port number to the one it sends
to, but a [udpreceive] in the same Pd process can still receive on
that port.


On Tue, Jun 1, 2021 at 4:57 PM Roman Haefeli <reduzent at gmail.com> 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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