MQTT Raspberry-Pi Kitchen Ring-Bell Publisher ‒ A minimal MQTT client to ring when the food is ready!

MQTT Raspberry-Pi Kitchen Ring Publisher is a minimal Python solution that integrates paho-mqtt for creating an MQTT client, that is triggered upon button press.

How to use on the Raspberry Pi (Debian based OSes)

sudo apt install libsystemd-dev python3-systemd
git clone https://github.com/supercomputer7/rpi-mqtt-kitchen-ringbell-button-publisher
cd rpi-mqtt-kitchen-ringbell-button-publisher
sudo python3 -m pip install -r requirements.txt

# Execute the MQTT publisher script
python3 publisher.py \ 
    --mqtt-broker-ip MQTT_IP \
    --mqtt-topic MQTT_TOPIC \
    --mqtt-user MQTT_USER \
    --mqtt-password MQTT_PASS \
    --mqtt-published-data MQTT_DATA \
    --gpio-pin-input GPIO_PIN

You can use this Python script as a systemd service with the provided mqtt-kitchen-button-publisher.service file. Please configure the script as desired by editing the service file. Then install the service by running the following commands:

sudo mkdir -p /opt/mqtt_kitchen_button_publisher/
sudo install publisher.py /opt/mqtt_kitchen_button_publisher
sudo install mqtt-kitchen-button-publisher.service /etc/systemd/system
sudo systemctl daemon-reload
sudo systemctl enable mqtt-kitchen-button-publisher.service
sudo systemctl start mqtt-kitchen-button-publisher.service

Frequent Disconnections from the MQTT broker

You might consider disabling WiFi Power saving mode due to frequent disconnections from the MQTT broker.

Disable WiFi Power Saving: Suggestions are taken from answers to this question.
Ensure the keepalive timeout when connecting the MQTT broker is infinite (0)

Either disable WiFi Power Saving by:

Creating new systemd service and enabling/disabling it appropriately
Adding new line to /etc/rc.local to disable WiFi power saving.

Both problems were resolved for me, but you might need to investigate further. Check the journal log to examine the rc (return code) on why the program failed and also if possible, check the logs of your MQTT broker.

License

The project is licensed under the MIT license.