[BRLTTY] xbrlapi can't read keys from brlapi

[payman shaykhmehdi]

I've compiled brltty 6.6 in ubuntu 20.04.6 LTS. Braille output in X windows
and graphical apps works great.
 But the problem is with braille input. It seems that xbrlapi can not read
keys from brlapi connection.
I think that it is a permissions issue, due to usb device permission, I'm
running brltty with root permission and running xbrlapi with root
privileges doesn't make any difference.


Also these logs from brltty doesn't look good :

brltty: can't isolate namespaces
> brltty: can't set supplementary groups
> brltty: group not joined: 5(tty)
> brltty: group not joined: 20(dialout)
> brltty: group not joined: 29(audio)
> brltty: group not joined: 106(input)
> brltty: group not joined: 115(pulse-access)
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