root@raspi:~# udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB0) | grep ATTRS{serial}
ATTRS{serial}=="AxxxxxxJ"
ATTRS{serial}=="0000:01:00.0"
root@raspi:~# udevadm info -a -p $(udevadm info -q path -n /dev/ttyUSB1) | grep ATTRS{serial}
ATTRS{serial}=="AxxxxxxR"
ATTRS{serial}=="0000:01:00.0"
root@raspi:~# cat /etc/udev/rules.d/99-local.rules
KERNEL=="ttyUSB[0-9]*", MODE="0666"
SUBSYSTEMS=="usb", KERNEL=="ttyUSB?", ATTRS{serial}=="AxxxxxxJ", SYMLINK+="AxxxxxxJ"
SUBSYSTEMS=="usb", KERNEL=="ttyUSB?", ATTRS{serial}=="AxxxxxxR", SYMLINK+="AxxxxxxR"
root@raspi:/dev# ls -l A* ttyUSB*
lrwxrwxrwx 1 root root 7 15. Jul 18:30 AxxxxxxR -> ttyUSB1
lrwxrwxrwx 1 root root 7 15. Jul 18:30 AxxxxxxJ -> ttyUSB0
crw-rw-rw- 1 root plugdev 188, 0 15. Jul 18:30 ttyUSB0
crw-rw-rw- 1 root plugdev 188, 1 15. Jul 18:30 ttyUSB1