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systemctl-mqtt

MQTT client triggering & reporting shutdown on systemd-based systems

Setup

$ pip3 install --user --upgrade systemctl-mqtt
$ systemctl-mqtt --mqtt-host HOSTNAME_OR_IP_ADDRESS

On debian-based systems, dependencies can optionally be installed via:

$ sudo apt-get install --no-install-recommends python3-dbus python3-gi python3-paho-mqtt

Usage

Schedule Poweroff

Schedule poweroff by sending a MQTT message to topic systemctl/hostname/poweroff.

$ mosquitto_pub -h MQTT_BROKER -t systemctl/hostname/poweroff -n

Shutdown Report

systemctl-mqtt subscribes to logind's PrepareForShutdown signal.

systemctl halt|poweroff|reboot triggers a message with payload true on topic systemctl/hostname/preparing-for-shutdown.

Lock Screen

Lock screen by sending a MQTT message to topic systemctl/hostname/lock-all-sessions.

$ mosquitto_pub -h MQTT_BROKER -t systemctl/hostname/lock-all-sessions -n

Home Assistant 🏡

Sample Setup

Send Poweroff Command

# https://www.home-assistant.io/docs/mqtt/broker/#configuration-variables
mqtt:
  broker: BROKER_HOSTNAME_OR_IP_ADDRESS
  # credentials, additional options…

script:
  poweroff_raspberry_pi:
    sequence:
      service: mqtt.publish
      data:
        topic: systemctl/raspberrypi/poweroff

homeassistant:
  customize:
    script.poweroff_raspberry_pi:
      friendly_name: poweroff pi
      icon: mdi:power

Trigger Automation on Shutdown

automation:
- trigger:
    platform: mqtt
    topic: systemctl/raspberrypi/preparing-for-shutdown
    payload: 'true'
  action:
    service: switch.turn_off
    entity_id: switch.desk_lamp

Automatic Discovery of Shutdown Sensor (Optional)

After enabling MQTT device discovery home assistant will automatically detect a new entity binary_sensor.hostname_preparing_for_shutdown.

mqtt:
  broker: BROKER_HOSTNAME_OR_IP_ADDRESS
  discovery: true # default in home assistant >=v0.117.0
  # credentials, additional options…

When using a custom discovery_prefix pass --homeassistant-discovery-prefix custom-prefix to systemctl-mqtt.

Docker 🐳

Clone this repository.
Edit docker-compose.yml.
Load AppArmor profile: sudo apparmor_parser ./docker-apparmor-profile
sudo docker-compose up --build

Pre-built docker image are available at https://hub.docker.com/r/fphammerle/systemctl-mqtt/tags

Annotation of signed tags docker/* contains docker image digests: https://github.com/fphammerle/systemctl-mqtt/tags

MQTT via TLS

TLS is enabled by default. Run systemctl-mqtt --mqtt-disable-tls … to disable TLS.

MQTT Authentication

systemctl-mqtt --mqtt-username me --mqtt-password secret …
# or
systemctl-mqtt --mqtt-username me --mqtt-password-file /var/lib/secrets/mqtt/password …

Adapt Poweroff Delay

systemctl-mqtt --poweroff-delay-seconds 60 …

README.md