Are you trying to use the system device following an open?
Are you modifying the system USB device?

At the current state I only did a cat of /dev/usb ( which is a symlink to /dev/usb0 ), to see that data was transmitted from the remote machine.

What happens if you try an open on the USB device if it has already been opened? Is it exclusive?

It's not totally exclusive I think, as a cat succeeds when the player app is running, but I guess all data sent by the client is swallowed by the player-app ( I'm not totally sure on this, will check this evening )

Frank van Gestel