[BRLTTY] Keyboard support HandyTech braille star 80 in brltty

[Halim Sahin]

Hi Folks,

I've connected a Keyboard to my braillestar and use brltty 6.3.
The display is connected via usb or serial (both tested).

The keyboard works well most of the time but.

1. sometimes the pc doesn't get keyreleases reliably
  This results in blocked keyboard or hanging arrowkeys etc.

2. Somethimes the braille display freezes completely so it want a
restart and switching to extern keyboard and back. to work again in
brltty.

Any ideas?
Regards
Halim