Thing zigbee:coordinator_cc2531:stick1 "Zigbee USB Stick" [zigbee_port="/dev/ttyACM0", zigbee_baud=38400, zigbee_panid=35637, zigbee_extendedpanid="118E309DE90CC829", zigbee_networkkey="14 c6 a2 c7 fb e0 c3 19 8e 7c 36 30 dc ad a5 96"]
results in this error:
2019-09-02 19:23:08.065 [ERROR] [ding.zigbee.handler.ZigBeeSerialPort] - Serial Error: Port /dev/ttyACM0 does not exist.
2019-09-02 19:23:09.663 [ERROR] [.cc2531.network.ZigBeeNetworkManager] - Failed to open the dongle.
I have read about adding the openhab user to specific groups and allowing him the access to the USB ports. What I have tried is adding the user to the administrators temporarily without success. I have no clue how I can specifically allow the USB port access on a Synology DSM system.
While not related to the issue you report, I would strongly advise you to use a newer version. 2.3 is very old and the ZigBee binding has received a LOT of updates in the past year or more since 2.3 was released. You will likely have problems with such an old version that I won’t be able to support.