I'm setting up a turnkey system that uses a Zebra brand USB barcode printer. I need to use it without CUPS, directly printing from an application. I've verified that this works when my application writes to /dev/usb/lp0. I've had to either run the application as root or change the permissions on /dev/usb/lp0. I though I could solve this problem by using a udev rule to recognize the printer, create a symlink, and set the permissions. I created the following rule in /etc/udev/rules.d/99-zebra.rules.
SUBSYSTEM=="usb", ACTION=="add", ATTRS{idVendor}=="0a5f", ATTRS{idProduct}=="011c", MODE="0666", SYMLINK+="zebra
This sort of works, but not in any useful way. It does recognize the printer, but instead of creating the symlink to /dev/usb/lp0 and changing the permission of that device file, it creates a symlink to e.g. /dev/bus/usb/001/002, and sets the permissions of that. However, I can't print to /dev/bus/usb/001/002 (or the symlink to that). Printing to /dev/usb/lp0 still works fine.
How do I write a udev rule that will set the permission of and symlink to /dev/usb/lp0 instead of the raw USB device?
Thanks! Eric