Re: comms/py-serial in NetBSD vs Linux differences

[Ramiro Aceves <ea1abz%gmail.com@localhost>]

El 12/1/25 a las 1:01, snow flurry escribió:
> On Saturday, 11 January 2025 08:51:06 PST Ramiro Aceves wrote:
> > LINUX:
> >
> > device /dev/ttyACM0
> > name ttyACM0
> > description ChibiOS/RT Virtual COM Port
> > hwid USB VID:PID=0483:5740 SER=400 LOCATION=1-1.2:1.0
> > vid 1155
> > pid 22336
> > serial_number 400
> > location 1-1.2:1.0
> > manufacturer STMicroelectronics
> > product ChibiOS/RT Virtual COM Port
> > interface None
> >
> >
> > NETBSD outputs 121 devices but I print below the device of interest
> > There is no information about the description, hwid, vendor, product and
> > serial number:
> >
> > device /dev/dtyU0
> > name dtyU0
> > description n/a
> > hwid n/a
> > vid None
> > pid None
> > serial_number None
> > location None
> > manufacturer None
> > prpy313-libusb1oduct None
> > interface None
> >
> > Have you noticed this behaviour in py-serial under NetBSD or am I
> > missing something?
>
> py-serial looks through /sys/class/tty/* on Linux, which provides the HW IDs,
> serial number, etc for USB serial devices. Since other Unix-like systems don't
> have sysfs, py-serial falls back to looking at /dev for files fitting a
> certain pattern (in NetBSD's case, /dev/dty*). This isn't a particularly
> useful way of finding a device, as you've found.

Oh thanks Snow, I understand now. I have filled a suggestion at the 
github nanovnasaver page to ask for adding  manual serial port 
configuration settings for the BSDs besides the automagical port selection.

https://github.com/NanoVNA-Saver/nanovna-saver/issues/753

> A possible patch to py-serial might involve using something like drvctl(4) to
> get information on a given console device, although I'm unsure if that'd give
> equivalent information on the device. Though, an easier route would be to get
> NanoVNA-Saver to let you choose a serial device without detecting it through
> list_ports.

Yes, of course, it is easier a manual serial port data entry.
Many thanks for your help.

Regards.
Ramiro.

> > Thanks.
> >
> > Ramiro.