[BRLTTY] Problem connecting the braille display Brailliant BI 40

[Mario Lang]

Shérab <Sebastien.Hinderer at ens-lyon.org> writes:

> Hello Didier,
>
> Thanks a lot for your response.
>
> Didier Spaier (2015/11/12 21:13 +0100):
>> I am not sure that I understand your question.
>> 
>> In brltty-5.2 this is done installing the file
>> 40-usb-brltty.rules in /lib/udev, or do I miss something?
>
> I am on Deban andhave brltty 5.2~20141018-5+b2 installed,it seems this
> is themost recent version of thepackage.
>
> I used this command:
>
> dpkg -L brltty | grep udev
>
> And the only result I got was:
>
> /usr/share/doc/brltty/examples/udev.rules.gz
>
> And I confirm that under/lib/udev/ nothing matches *brltty*

Yes, because udev-activation is not enabled on Debian by default.
You are free to use the example file provided to configure your system
to use it.
I'd be interested in hearing how it works for you, after you give it
some time for testing.

> So I think that indeed if the file you mention would be there everything
> would work fine but it's not! :)

I am not quite sure that *everything* would work just fine.
The problem here is that udev rules can basically just be used
to do auto-activation if you use USB.  However, not all
configurations do exclusively use USB.  My laptop, for instance,
has BRLTTY configured to find my display *either* via USB or Bluetooth.
This has prooven to be very helpful once my bluetooth stack broke.

Additionally, some people are still using serial braille displays.
These can also not be handled by udev (AFAIK).

If we enable udev activation by default, we need to teach the users
additionally about the fact that in some cases, they will have to enable
the daemon, and in some other cases they dont.

I am personally not ready to open that can of worms yet.
Especially, because I don't really see what we would be gaining.
Most of us have BRLTTY around on their systems most of the time anyway.
And if resource consumption is a problem, for instance, on an embedded
system, you can still manually drop these udev rules into your system
configuration and use them.  However, maybe I am missing an obvious
point.
Why is it particularily pressing to give up control about launching
brltty?  Just another link in a chian of things that should never break.

-- 
CYa,
  ⡍⠁⠗⠊⠕