I use ttymidi as serial bridge MIDI on RaspberryPi. Now I can use Arduino as a MIDI controller for PD.
I connect PD with Ttymidi using Patchage but when I reboot the Rpi all connections are gone. I have to connect it again. Do you know how to ‘remember’ the connection after rebooting?

@Butahuruf For Pd midi settings use this patch....... get_set_midi.pd to get your midi settings from the midi dialog.
With the patch open, edit your midi settings in Pd to what you want, and apply the settings and click ok.
You will see a message appear in the patch.
Copy the message into your patch and use a [loadbang] to bang the message into [send pd] when your patch starts.

Jack can save its patch connections in its configuration file.
I would think Jack will make a port available in Patchage even though Pd has not started..... as Jack needs to start before Pd.
David.

Thanks David.
This is more a rpi question I solve with aconnectgui
Sur