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Another my personal problem with UDEV.
I have USB connected module with 4 opto isolated inputs and 4 relay outputs. The definition of such module is not included in udev rules. Of course each time I connect this module to PC, it install itself on random USB device bus/port, depending on physical port it is connected to. So I want to see this module with constant name device. Below output from udevadm:

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[root@Piotr ~]# /sbin/udevadm info -q all -n /dev/bus/usb/005/004                       
P: /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1
N: bus/usb/005/004
E: BUSNUM=005
E: DEVNAME=/dev/bus/usb/005/004
E: DEVNUM=004
E: DEVPATH=/devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1
E: DEVTYPE=usb_device
E: DRIVER=usb
E: ID_BUS=usb
E: ID_MODEL=DIG_IO_USB
E: ID_MODEL_ENC=DIG_IO_USB
E: ID_MODEL_ID=0001
E: ID_REVISION=0600
E: ID_SERIAL=ARCO_DIG_IO_USB_DIG_IO_0
E: ID_SERIAL_SHORT=DIG_IO_0
E: ID_USB_INTERFACES=:ffffff:
E: ID_VENDOR=ARCO
E: ID_VENDOR_ENC=ARCO
E: ID_VENDOR_FROM_DATABASE=Epiphan Systems Inc.
E: ID_VENDOR_ID=5555
E: MAJOR=189
E: MINOR=515
E: PRODUCT=5555/1/600
E: SUBSYSTEM=usb
E: TYPE=0/0/0
E: USEC_INITIALIZED=901677791

And output from journalctl during disconnect/connect of this module:

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sie 12 08:05:11 Piotr kernel: usb 5-1: USB disconnect, device number 4
sie 12 08:05:17 Piotr kernel: usb 5-1: new full-speed USB device number 5 using xhci_hcd
sie 12 08:05:17 Piotr kernel: usb 5-1: New USB device found, idVendor=5555, idProduct=0001
sie 12 08:05:17 Piotr kernel: usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
sie 12 08:05:17 Piotr kernel: usb 5-1: Product: DIG_IO_USB
sie 12 08:05:17 Piotr kernel: usb 5-1: Manufacturer: ARCO
sie 12 08:05:17 Piotr kernel: usb 5-1: SerialNumber: DIG_IO_0
sie 12 08:05:17 Piotr mtp-probe[5454]: checking bus 5, device 5: "/sys/devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1"
sie 12 08:05:17 Piotr mtp-probe[5454]: bus: 5, device: 5 was not an MTP device

I wrote udev rule as below:

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[root@Piotr rules.d]# cat 11-usb-ftd.rules
SUBSYSTEM=="usb" , ACTION=="add" , ATTRS{idVendor}=="5555", ATTRS{idProduct}=="0001" , ATTRS{SerialNumber}=="DIG_IO_0" , SYMLINK+="arco"

As all manuals stands, now should be created /dev/arco each time I connect device to any USB port - but it doesnt. Any idea what I am doing wrong?

Why open a separate thread, when this is also about udev persistent devicenode naming, and your other thread isn't solved yet?

This topic I will mark as SOLVED, but the second one is partially solved, just update in several minutes.
So in this topic, after several hours of work, I created such udev rule:

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[root@mackowiak rules.d]# cat 11-usb-arco.rules
SUBSYSTEM=="usb" , ACTION=="add" , ATTRS{idVendor}=="5555", ATTRS{idProduct}=="0001" , OWNER="media" , GROUP="media" , SYMLINK+="arco"

and than:

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udevadmin trigger

And after unplug/plug, /dev/arco appears as should be.
But I dont feel the udev mechanisms....