[BRLTTY] HelpTech Activator aC4: Unable send any key input

[Tim Böttcher]

Hi, all,

it used to be possible to connect my Activator to my RaspBerry Pi via 
USB (albeit I never got bluetooth to work) and use it that way.

I used it with BRLTTY 6.5 through 6.7. Recently, my Activator returned 
from repairs and is now at Firmware version 2.6(was 2.3 previously). 
Now, I can still read and scroll within the buffer sent by BRLTTY, but I 
cannot type anything, neither on the included qwerty keyboard, nor on 
the Braille keyboard.

This appears to be version-independent--tested it with BRLTTY 6.7 and 
6.9.1 on Debian and Ubuntu. I haven't tested bluetooth yet but given it 
didn't work before, I'm not hopeful it's working now.

My suspicion is that the firmware update broke something. Has anyone 
else encountered this issue? Any idea what I could do other than report 
this to HelpTech?

Kind regards,
Tim
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