Allow Home Assistant to auto discover your Raspberry Pi (or other linux devices) and expose a Shutdown and Restart button over MQTT.
Heavily inspired by olkal's RPI-MQTT-shutdown repo.
# you may need to install a few packages first but
# on a raspberry pi they're probably already installed
#apt update
#apt install -y pip git python3 nano
sudo pip install paho-mqtt
cd /usr/local/bin
sudo git clone https://github.com/Denifia/home-assistant-raspberry-pi-mqtt.git
# edit to suit your environment
sudo nano /usr/local/bin/home-assistant-raspberry-pi-mqtt/mqtt-device.py
# test that it starts up
sudo python /usr/local/bin/home-assistant-raspberry-pi-mqtt/mqtt-device.py
# your raspberry pi and it's two buttons should now be in home assistant!cd /usr/local/bin/home-assistant-raspberry-pi-mqtt
sudo mv mqtt-device.service /etc/systemd/system/
sudo systemctl enable mqtt-device.service
# start the service now instead of waiting for a reboot
sudo systemctl start mqtt-device.service