[GTALUG] Problem with /dev/ttyUSB* serial port

[Alvin Starr]

On 10/31/19 2:25 AM, Jim Ruxton via talk wrote:
> I have a device plugged into an active USB extender that usually shows 
> up as /dev/ttyUSB0 when I first plug it in (occasionally it will show 
> up as /dev/ttyUSB1 when first plugging it in) . If it is /dev/ttyUSB0 
> when I unplug it and plug it back in it occasionally changes to 
> /dev/ttyUSB1 . Is there a way that I can always have it show up as 
> /dev/ttyUSB0 . I'm not sure why /dev/ttyUSB0 isn't being released and 
> restarted after unplugging and replugging it. If I look in /dev it 
> does disappear as /dev/ttyUSB0 from there when I unplug it but like I 
> said it reappears as /dev/ttyUSB1? I am on Ubuntu 18.04.3 LTS .
>
> Thanks for any pointers.

Thinking on this some more.
You could try using /dev/serial/by-path or /dev/serial/by-id
"ls /dev/serial/by-path/" -> pci-0000:00:12.2-usb-0:3.5:1.0-port0
"ls /dev/serial/by-id" -> 
usb-Prolific_Technology_Inc._USB-Serial_Controller-if00-port0

These should stay device and connection tree uinque

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Alvin Starr                   ||   land:  (647)478-6285
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