Configuring MQTT

If using MQTT to publish messages, you'll first need:

• A broker for Notifier to connect to.
• One or more topics to publish messages to.

Choose a broker

Notifier works with any standard MQTT broker, including:

• Mosquitto (self-hosted, open source)
• EMQX
• HiveMQ
• AWS IoT Core (cloud, certificate-authenticated)

For Testing Only

You can use a free public test broker like test.mosquitto.org if you're just experimenting.

Configure Notifier

If your broker requires sensitive credentials, store them in your .env file:

MQTT_USERNAME="..."
MQTT_PASSWORD="..."

Then in the Craft control panel, go to Settings → Plugins → Notifier → MQTT to:

• Enter the broker's Host and Port.
• Enable Use TLS for a secure connection.
• Set a Username and Password if needed (reference the .env variable, e.g. $MQTT_PASSWORD).
• Optionally choose the MQTT Version and a Client ID.
• For certificate-authenticated brokers like AWS IoT Core, fill in the Mutual TLS certificate paths.
• Add one or more recipient topics.

Testing

You'll also find a simple Test button next to each topic in the settings.

Clicking it publishes a test message to that topic, to confirm each topic configuration is valid.