Assign a FIX path for printer

My version is OpenWrt 18.06.0-rc1 r7090-d2aa3a1b62 / LuCI openwrt-18.06 branch (git-18.163.60998-c379f00). After install p910nd printer server, it is working fine with two Brother USB Printer. But I need fix it path /dev/usb/lp0 & /dev/usb/lp1 otherwise the service will not work if one of a printer reboot / sleep.
I try many times follow step from internet also not work, please help let me know how to do it. How to make the hotplug feature under control!
Thanks a lot!