[PD] ugly "already connected" errors

[Roman Haefeli]

On Fri, 2019-01-25 at 15:01 +0100, michael strohmann wrote:
> thanks for the answer!
> but, 
> in order to show that there is a connection betwenn the app to pd i
> do:
> 
> [metro 1000]
> > 
> 
> [toggle(					
> > 
> 
> [oscformat BlinkingButton/value]
> > 
> 
> [list prepend send]
> > 
> 
> [list trim]
> >    \
> > 	[t b]
> > 	|
> > 	[disconnect, connect 192.168.178.189 8000(
> >    /
> 
> [netsend -u -b] 
> 
> now everytime the phone is not available i get:
> recv: Connection refused (111)
> netsend: Bad file descriptor (9)
> warning: 35 removed from poll list but not found
> 
> if i dont disconnect before sending i get the “already connected”
> error.
> and if i only connect once and leave the pd side connected, no
> messages are received on the phone once it leaves the wlan.
> 
> messages sent from the phone are almost always received.
> 
> in any case it get a console message, either “connecting to port
> 8000” or “already connected”
> 
> i am just concerned because my patch crashes or freezes or create
> glitchy digital artefacts from time to time, and since it is a 24/7
> audio installation i would like it to work.
> how to find these bugs...

Oh, I see. That's much messier than I thought. I always believed an UDP
socket stays open regardless of the presence of the other end. But
seems to be not fully true. I'm not sure what's going on but it looks
like the OS closes the socket without [netsend] actually noticing it. 

I would try what Antoine suggested and send a 'disconnect' each time
before you connect again. There should be no harm in 'disconnect'ing
and 'connect'ing many times.

Roman

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