[LAU] Re: monitoring jack connections

On 26/10/2025 16:21, Bill Purvis wrote:
> I've been having problems with connections between jack clients dropping 
> out.
> I would like to have a program that monitors the state of connections.
> I've worked out how to locate the end client ports, but I don't want to 
> have
> poll the connections at frequent intervals. Is there any way I can get a
> callback when either of the clients drops out?
> 
> I suppose I could set up links between by monitor and the two client ports
> and activate those connections, but that seems like overkill. Is there 
> an easier way.
> 
> I'm actually using pipewire-jack but don't know enough about pipewire to 
> do it
> directly.
> 

If I understand correctly what you are trying to achieve, I have used 
the QJackCtl 'Patchbay' for this, especially in live situations where I 
need to plug/unplug a midi (USB) controller in or (re)start a bunch of 
applications like Yoshimi with a new state and/or Pd, etc.

This is a detailed explanation of how it works... Although admittedly I 
often just set-up connections as needed and create a new patchbay based 
on the current 'snapshot':

https://www.rncbc.org/drupal/comment/1743

In the past I have also used aj-snapshot [1] for a command-line approach 
and embedded in scripts as it can also store/retrieve snapshots in 
files. This only works with Midi connections (ALSA and/or JACK) (but 
then many applications allow to 'auto-connect' audio ports, so YMMV)

Finally, it seems qpwgraph [2], connection manager for PipeWire has a 
similar 'patchbay' functionality [3]. I haven't tried it much because 
all pipewire 'managers' seem to ignore ALSA MIDI which I am still using 
quite a lot, and the 'Midi Bridge' is not working at best on jack-midi 
clients' sides..

Hope this helps,
Lorenzo

[1] https://aj-snapshot.sourceforge.io/
[2] https://gitlab.freedesktop.org/rncbc/qpwgraph
[3] 
https://gitlab.freedesktop.org/rncbc/qpwgraph/-/blob/main/docs/qpwgraph_patchbay-user_manual.md
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