sorry to say but I found another bug, which occurs time-to-time after sleep mode.
The symptoms: the devices is disconnected after few sec. The app is running fine, able to connect to server, user is able to assign device, however, after few seconds the devices is unbounded
Jun 26 08:40:20 localhost vhusbdi386: Device 2131 BOUND to connection 81
Jun 26 08:40:25 localhost vhusbdi386: Device 2131 UNBOUND from connection 81
The only way how to solve it - restart of OSX
Thanks for your support