Hi!
I'm trying to get a persistent serial port mapping for my three usb-serial devices, following the turorial- I can make it work nicely for 2 out of my 3 devices. But I guess I need some help with the third - it is not quite identical, so should I treat it differently? Its my focuser (home made, Arduino)

When I connect it, dmesg says:
[ 237.028014] usb 1-1.3.1: new full-speed USB device number 10 using dwc_otg
[ 237.151224] usb 1-1.3.1: New USB device found, idVendor=1a86, idProduct=7523
[ 237.151249] usb 1-1.3.1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 237.151262] usb 1-1.3.1: Product: USB2.0-Serial
[ 237.152383] ch341 1-1.3.1:1.0: ch341-uart converter detected

And:
pi@raspberry:/lib/udev/rules.s$ udevadm info -a -n /dev/ttyUSB2 | grep '{serial}' | head -n1
ATTRS{serial}=="3f980000.usb"

I have the following in my /lib/udev/rules.s/99-observatory.rules file:
# Focuser

SUBSYSTEMS=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", ATTRS{serial}=="3f980000.usb", MODE="0666", SYMLINK+="focuser"

But no /dev/focuser is created. What do I do wrong?

Magnus

If the VID:PID combination is unique (the other 2 devices have different VID:PIDs), no need to add the addition "serial" stuff.

Hi!

So I change the lines to:

# Focuser

SUBSYSTEMS=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", MODE="0666", SYMLINK+="focuser"

dmesg still says:
[ 472.580964] usb 1-1.3.1: new full-speed USB device number 19 using dwc_otg
[ 472.704110] usb 1-1.3.1: New USB device found, idVendor=1a86, idProduct=7523
[ 472.704131] usb 1-1.3.1: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[ 472.704144] usb 1-1.3.1: Product: USB2.0-Serial
[ 472.705138] ch341 1-1.3.1:1.0: ch341-uart converter detected
[ 472.709122] usb 1-1.3.1: ch341-uart converter now attached to ttyUSB2

so 2 of my 3 devices have dedicated nodes:
pi@raspberry:~$ ls -l /dev | grep USB
lrwxrwxrwx 1 root root 7 sep 5 14:07 mount -> ttyUSB0
lrwxrwxrwx 1 root root 7 sep 5 14:07 shutter -> ttyUSB1
crw-rw-rw- 1 root dialout 188, 0 sep 5 14:07 ttyUSB0
crw-rw-rw- 1 root dialout 188, 1 sep 5 14:07 ttyUSB1
crw-rw---- 1 root dialout 188, 2 sep 5 14:07 ttyUSB2

What's wrong with my rules-file.....?

Magnus

what is the rule filename? I presume you restarted your Pi after the change to the rules file? Your other devices have different VID:PIDs? All of this in one file or multiple files?

Hi!
Here's the file:

pi@raspberry:/lib/udev/rules.s$ cat /lib/udev/rules.s/99-observatory.rules
# Gemini Mount

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ATTRS{serial}=="FTCC5RMS", MODE="0666", SYMLINK+="mount"

# Canon DSLR shutter release

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6015", ATTRS{serial}=="FTZ3D6YP", MODE="0666", SYMLINK+="shutter"

# Focuser

SUBSYSTEMS=="usb", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", MODE="0666", SYMLINK+="focuser"


Yes, I've restarted numerous times. Two first works nicely, devices are created.

Magnus

The file itself seems OK. Custom rules are supposed to be located in /etc/udev/rules.d/

Hi!

Yes, that's a bit confusing. I don't understand the difference between rules.s and rules.d. But the tutorial actually says rules.s...

Let me try placing it in rules.d.

Magnus

Bingo!
Now it's working, with the file in rules.d instead.
Magnus

/me quietly fixes the typo in the tutorial! Glad it's working for you now. I actually plan to make this udev rules mess a thing of the past, I will _try_ to make an addon to INDI Web Manager where you get to assign the names via the web GUI. Don't hold your breath though, this might take a while.