I set this up earlier today and was able to see the mobile devices from other hubs in the selection screen when logging into a hub on the mobile app.
For now I have left them duplicated and select the device "local" to the hub, but I may rationalise these down at some point.
I also made use of @bertabcd1234 's notification proxy app. Not strictly required to deliver what I was after in this thread, but a nice addition nonetheless. This allows for mobile devices to be grouped together and referenced using one virtual device in apps where notifications are being sent. Nice work @bertabcd1234!!
