comms/py-serial in NetBSD vs Linux differences

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

Hello,

I am trying to make nanovnasaver program work under NetBSD. NanoVNA  is 
a cheap Vector Network Analyzer (30$ only) that connects to the USB 
port. Nanovnasaver is a python program that manages the device and make 
very useful RF S-parameters measurements, graphing and data saving. The 
code is at Github here:

https://github.com/NanoVNA-Saver

Device detection fails in NetBSD, in Linux it works just fine (also 
FreeBSD fails).

Device detection and communication relies on py-serial python module.

Under Linux, device is /dev/ttyAMC0, in NetBSD device is /dev/ttyU0 and 
/dev/dtyU0 (never understood which to use). I have given permission to 
the device and can perfectly be accesed with the cu program as a normal 
user (both ttyU0 and dtyU0 work):

netbsd-x260$ cu -l /dev/ttyU0
Connected

ChibiOS/RT Shell
ch> help
Commands: help exit info threads version reset freq offset time dac 
saveconfig clearconfig data dump frequencies port stat gain power sample 
scan sweep test touchcal touchtest pause resume cal save recall trace 
marker edelay capture vbat transform threshold
ch> info
Kernel:       4.0.0
Compiler:     GCC 8.2.1 20181213 (release) [gcc-8-branch revision 267074]
Architecture: ARMv6-M
Core Variant: Cortex-M0
Port Info:    Preemption through NMI
Platform:     STM32F072xB Entry Level Medium Density devices
Board:        NanoVNA-H
Build time:   Oct 18 2019 - 16:10:54
ch> ~
[EOT]
netbsd-x260$

Nanovnaserver uses py-serial python module to communicate, but in NetBSD 
nanovnasaver program is confused with py-serial detection functions 
output, they do not work the same as in Linux.

LINUX detects theese ports:

ramiro@debian-x260:~$ pyserial-ports -v
/dev/ttyACM0
    desc: ChibiOS/RT Virtual COM Port
    hwid: USB VID:PID=0483:5740 SER=400 LOCATION=1-1:1.0
/dev/ttyS0
    desc: n/a
    hwid: n/a
2 ports found
ramiro@debian-x260:~$

On the other hand, in NetBSD py-serial detects 121 of devices but no 
useful information on /dev/ttyU0 and /dev/dtyU0

NETBSD:

netbsd-x260$ pyserial-ports-3.12
/dev/dty00
/dev/dty01
/dev/dty02
/dev/dty03
/dev/dtyCY000
...

...
/dev/dtyCZ0000
...

...
/dev/dtyCZ0063
/dev/dtyHS0.00
...

...

/dev/dtyHS0.10
/dev/dtyU0
/dev/dtyU1
/dev/dtyU2
/dev/dtyU3
/dev/dtyU4
/dev/dtyU5
/dev/dtyU6
/dev/dtyU7
/dev/dtyY0
/dev/dtyY1
121 ports found
netbsd-x260$

If more detail is requested it does not output more details:

netbsd-x260# pyserial-ports-3.12 -v
/dev/dty00
    desc: n/a
    hwid: n/a


..

..


/dev/dtyU0
    desc: n/a
    hwid: n/a
/dev/dtyU1
    desc: n/a
    hwid: n/a
/dev/dtyU2
    desc: n/a
    hwid: n/a
/dev/dtyU3
    desc: n/a
    hwid: n/a
/dev/dtyU4
    desc: n/a
    hwid: n/a
/dev/dtyU5
    desc: n/a
    hwid: n/a
/dev/dtyU6
    desc: n/a
    hwid: n/a
/dev/dtyU7
    desc: n/a
    hwid: n/a
/dev/dtyY0
    desc: n/a
    hwid: n/a
/dev/dtyY1
    desc: n/a
    hwid: n/a
121 ports found
netbsd-x260#

If I run this simple python program that scan the ports using py-serial 
python module:

netbsd-x260$ cat test.py

import serial
from serial.tools import list_ports
from serial.tools.list_ports_common import ListPortInfo

for d in list_ports.comports(include_links=True):
 print('device',d.device)
 print('name',d.name)
 print('description',d.description)
 print('hwid',d.hwid)
 print('vid',d.vid)
 print('pid',d.pid)
 print('serial_number',d.serial_number)
 print('location',d.location)
 print('manufacturer',d.manufacturer)
 print('product',d.product)
 print('interface',d.interface)

LINUX output:

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 only 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?

I can fool nanovnasaver entering the detection data literaly in the code 
and go further but first want to know if py-serial behaviour is right.

Thanks.

Ramiro.