udev

Start (and stop) a systemd daemon

Create a udev rule to start the daemon:

% cat /etc/udev/rules.d/10-bluetooth-service.rules 
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0a5c", ATTRS{idProduct}=="21e8", TAG+="systemd", ENV{SYSTEMD_WANTS}="bluetooth.service"

This one starts the bluetooth systemd service when a specific usb bluetooth dongle is added to the system.

If you need to find idVendor and idProduct you can start udevadm monitor --property while plugging the usb device in and out.

To stop the daemon again you need to edit the systemd service file of the daemon - in this case systemctl edit bluetooth.service:

[Unit]
BindsTo=sys-subsystem-bluetooth-devices-hci0.device
After=sys-subsystem-bluetooth-devices-hci0.device

The device name in this case is found by systemctl list-units --all --full | grep "\.device".

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udev

Start (and stop) a systemd daemon

871 B

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