iOS 15: new USB MIDI Port ID at each re-connection

Hi,

we are facing a weird issue with iOS 15: for some USB/MIDI devices, each time they get connected to the iPad via USB (or rebooted), we get a different Port ID.
Since our host relies on the Port ID to reconnect the Port to the graph, the result is that the Port appears disconnected, and of course, the user is frustrated :slight_smile:
We cannot yet understand what those devices have in common. A couple of devices that show the problem are: Yamaha Motif, Yamaha Piaggero.
Here is an excerpt of the XML where we save the Port IDs each time a MIDI device connects.

      <MIDIOUTPUT name="YAMAHA MOTIF XF7 Porta 1" id="-119648265 1118310184" custom_name=""/>
      <MIDIOUTPUT name="YAMAHA MOTIF XF7 Porta 1" id="201398083 -1156807127" custom_name=""/>
      <MIDIOUTPUT name="YAMAHA MOTIF XF7 Porta 1" id="1881473804 1258374163" custom_name=""/>

Someone experiencing the same issue?

Best,
Emanuele