I had a hiccup on my Rpi4 after doing a apt update/upgrade and installing 2.22.01
Suddenly it would not connect to the stick any more.
Trick is doing a sudo dmesg | grep -i tty
Mine looked like: usb 2-6.4.4: FTDI USB Serial Device converter now attached to ttyUSB0 (Conbee I)
And at the end there is your device, that you need to supply as a startup parameter:
~ $ cat /lib/systemd/system/deconz.service
[Unit]
Description=deCONZ: ZigBee gateway -- REST API
Wants=deconz-init.service deconz-update.service
StartLimitIntervalSec=0
[Service]
User=1000
ExecStart=/usr/bin/deCONZ -platform minimal --http-port=80 --dev=/dev/ttyUSB0
Restart=on-failure
RestartSec=30
AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_KILL CAP_SYS_BOOT CAP_SYS_TIME
[Install]
WantedBy=multi-user.target
Why it suddenly needed that /dev option is a mystery to me …