I have successfully setup the server and connect to it with Windows and use the devices. This was a test and worked well.
On server side I have also set AutoAttachToKernel=1 so that I can use it when not in use by a client (/dev/ttyUSB0)
But when I try to use the Linux (i386) on Ubuntu (Linux ubuntu 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:12 UTC 2014 i686 i686 i686 GNU/Linux) I can connect my USB device (I kept the Windows client open and can see that the Linux client is connected) but how can I use the USB interface?
I would need to have it available like this: /dev/ttyUSB0
Thanks for your answer.