The key is that you send something between deletion and recreation.
I do!
BTW, that's on Linux, maybe other platforms behave differently?
Could be, I'm currently on windows but I'll check on my linux and osx machines.
Gesendet: Freitag, 25. Januar 2019 um 23:48 Uhr Von: "Roman Haefeli" reduzent@gmail.com An: pd-list@lists.iem.at Betreff: Re: [PD] ugly "already connected" errors
On Fri, 2019-01-25 at 22:44 +0100, Christof Ressi wrote:
From reading a bit more about protocols, particularly about ICMP [1], I think what happens is that the receiving host sends a ICMP error packet to the sending host, telling that the destination port is unreachable.
thanks, this might explain what happens. note, though, that this is not required behaviour for a UDP socket (and I haven't encountered this outside Pd), so I would rather make this optional (or add an option to deactivate this). The reason is that sometimes you just want to broadcast messages no matter if something is actually listening and you don't want that the sender to shut down just because the receiver is temporarily unavailable. of course you can wrap each message in a [connect( [disconnect( pair, but I think it's only an ugly workaround.
Yeah, I see how the current behavior is impractical. I'm just saying it is probably not a bug.
can tell that the socket of [udpsend] is closed, because when you fire up the listening socket again, messages sent with [udpsend] still don't reach their destination.
I can't confirm this. I just tested with a pair of [udpsend] and [udpreceive] (both iemlib and mrpeach) and I can change ports in [udpreceive] or delete/recreate it without [udpsend] closing its socket. only tested via localhost, though.
The key is that you send something between deletion and recreation. Otherwise you won't trigger an ICMP response. I tested also on localhost with a [udpreceive] and still get same behaviour I described. BTW, that's on Linux, maybe other platforms behave differently?
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