[LAU] Re: monitoring jack connections

On 10/27/25 5:17 AM, Lorenzo Sutton wrote:
> 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)

Just to clarify. aj-snapshot supports connecting audio ports with JACK. 
We used this intensively for connecting Jacktrip clients using 
aj-snapshot's daemon mode.

-- Nils

>
> 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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