[BRLTTY] Focus 1 70 display and USB to serial adapter: possible connecting this scenario?

[Hammer Attila]

Hi Dave,


I tryed with you wrote, but not worked unfortunatelly.

In syslog I see now following error message, translate to english for 
you in Ubuntu 20.04, BRLTTY 6.5:

Dec 22 14:01:56 hammera-pc brltty[1410]: unable to connect to polkit: 
g-io-error-quark (159) Error initializing authority: Could not connect: 
No such file or directory (1)

What file missing for BRLTTY and polkit related? When I used the my Alva 
display with USB connection, I not see similar error messages.

Another interesting error messages:

Dec 22 14:01:59 hammera-pc brltty[3886]: can't isolate namespaces

Dec 22 14:01:59 hammera-pc brltty[3886]: required capability not 
granted: cap_sys_admin (for injecting input characters typed on a 
braille device)
Dec 22 14:01:59 hammera-pc brltty[3886]: required capability not 
granted: cap_sys_tty_config (for playing alert tunes via the built-in PC 
speaker)
Dec 22 14:01:59 hammera-pc brltty[3886]: required capability not 
granted: cap_mknod (for creating needed but missing special device files)
Dec 22 14:01:59 hammera-pc dbus-daemon[3210]: [session uid=1000 
pid=3210] Activating via systemd: service name='org.a11y.Bus' 
unit='at-spi-dbus-bus.service' requested by ':1.154' (uid=1000 pid=3887 
comm="/bin/brltty -b ba -s no -x a2 -N " label="unconfined")
Dec 22 14:01:59 hammera-pc at-spi-bus-launcher[3901]: dbus-daemon[3901]: 
Activating service name='org.a11y.atspi.Registry' requested by ':1.0' 
(uid=1000 pid=3887 comm="/bin/brltty -b ba -s no -x a2 -N " 
label="unconfined")
Dec 22 14:01:59 hammera-pc brltty[3887]: Screen Driver: a2 [AtSpi2]
Dec 22 14:01:59 hammera-pc brltty[3887]: Braille Driver: ba [BrlAPI] 
Version:0.1, 2005
Dec 22 14:01:59 hammera-pc brltty[3887]: Speech Driver: no [NoSpeech]

Dec 22 14:01:59 hammera-pc brltty[3887]: ioctl[KDMKTONE] error 1: 
Operation not permitted


Me not have other ydea. USB to serial adapter connection is Ok, 
/dev/ttyACM0 device correct existing, the /etc/brltty.conf file correct 
setted fs driver parameter and the serial device line.

My Asus B550 motherboard based the tech specs supports one serial port 
connector, but not have back panel connector connected the motherboard.

Perhaps me need trying buying a 9 pin serial connector cable to the 
motherboard connector if not have better ydea.

General 9 pin serial to serial cable an another machine the display 
works correct the /dev/ttyS0 device, so the display is not bad and the 
serial port in the display is not bad.

Unfortunatelly the display USB port with usb cable is unusable the 
BRLTTY 6.5 and higher version, because shows following error message the 
log file:

[brltty] USB URB status error 75: The value is too large for the 
specified data type
2024-03-31 at 14:28:26.852 [brltty] USB: endpoint descriptor not found: 00

Attila
2024. 12. 21. 20:55 keltezéssel, Dave Mielke írta:

> [quoted lines by Hammer Attila on 2024/12/21 at 15:49 +0100]
>
>> so I buied a Genbird USB to serial 9 pin cable.
> That should work.
>
>> Both Ubuntu 20.04 and Debian 12 are correct detected my usb to serial cable,
>> and created correct the /dev/ttyACM0 device.
>>
>> In /etc/brltty.conf file I set braille driver related config key, and added
>> following line into the config file:
>>
>> braille-device    serial:ttyACM0    # First serial device.
> Yes, that's correct.
>
>> Because the display shows only the focus 70 related status message and not
>> the actual braille output, I restarted BRLTTY with sudo brltty -d
>> /dev/ttyACM0 and -D fs command,
> -D (uppercase D) is the wrong option. It tells brltty where to find the drivers, and I think that's what your problem is. To tell brltty which braille driver to use, please specify the -b (lowercase b) option.
>
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