udev rules

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zp@zp:/etc/udev/rules.d$ sudo cp ~/qrcode_tracking/
CMakeLists.txt    config/           cv_qr_code.kdev4  .git/             launch/           package.xml       README.md         src/              usb_rules/        
zp@zp:/etc/udev/rules.d$ sudo cp ~/qrcode_tracking/usb_rules/building_qr_cam.rules  .
[sudo] password for zp:
zp@zp:/etc/udev/rules.d$ ls
98-mars01a-lsusb.rules  building_qr_cam.rules
zp@zp:/etc/udev/rules.d$ sudo service udev restart
zp@zp:/etc/udev/rules.d$ ls /dev | grep qr
building_qr_cam
zp@zp:/etc/udev/rules.d$ cat building_qr_cam.rules
KERNEL=="video*", ATTRS{idVendor}=="2304", ATTRS{idProduct}=="8981", MODE:="0666", SYMLINK+="building_qr_cam"
zp@zp:/etc/udev/rules.d$

$dmesg

$lsusb

zp@zp:/etc/udev/rules.d$ sudo cp ~/qrcode_tracking/
CMakeLists.txt    config/           cv_qr_code.kdev4  .git/             launch/           package.xml       README.md         src/              usb_rules/        
zp@zp:/etc/udev/rules.d$ sudo cp ~/qrcode_tracking/usb_rules/building_qr_cam.rules  .
[sudo] password for zp: 
zp@zp:/etc/udev/rules.d$ ls
98-mars01a-lsusb.rules  building_qr_cam.rules
zp@zp:/etc/udev/rules.d$ sudo service udev restart
zp@zp:/etc/udev/rules.d$ ls /dev | grep qr
building_qr_cam
zp@zp:/etc/udev/rules.d$ cat building_qr_cam.rules 
KERNEL=="video*", ATTRS{idVendor}=="2304", ATTRS{idProduct}=="8981", MODE:="0666", SYMLINK+="building_qr_cam"
zp@zp:/etc/udev/rules.d$