[BRLTTY] HID slowness

[Mattia Scattolin]

Hello,

I have a Braille emotion and find the same problem.

Also there is a problem with multi key navigation for example to go at beginning of screen the multi key doesn’t work in both modes


> Il giorno 3 mar 2025, alle ore 17:15, Sébastien Hinderer <Sebastien.Hinderer at ens-lyon.org> ha scritto:
> 
> Hello,
> 
> Yannick and I happened to meet at one of our national distributor's
> office. We tested an eMotion device from HIMS whichwe found rather nice,
> ergonomically speaking.
> 
> In terms of USB connectivity, two modes of connection are supported:
> legacy and HID. Although both modes do work with BRLTTY, we noticed
> that, in HID mode there is considerably more latency than in USB legacy
> mode. For example, the round-trip time between a keypress and the
> corresponding update of the braille display nears the second while it is
> much shorter in USB (without being of great reactiveness but we think
> this is an internal problem).
> 
> Any suggestion on what could be done to improve the situation?
> 
> Best wishes,
> 
> Seb.
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