My Videohub Micro doesn't support this extra but I suppose the
bigger models do (at least the official software v6 reads this
value and shows it instead of the device model).

It is not tested on a real hardware. The number of frame buffers
is assumed to be the same as number of serial ports (as good guess
as any).

It is not tested on a real hardware.

Now both sides of a connection are seen:
  input  -> output(s)
  output <- input

This prints the device configuration as videohubctrl parameters thus
allowing the configuration to be restored later.