Node-RED: Simple example: using Node-RED with the MQTT server

This documentation is part of the MQTT server guide. View the full guide here: How to connect Node-RED to Mosquitto MQTT server.

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If you are new to MQTT with Node-RED, here is a simple example to help you get up and running. This example shows how to send a message to a topic and receive messages from it. You can download the flow example and import it into your Node-RED instance using the "Import" menu.

Simple example of connecting MQTT to Node-RED

If your MQTT nodes are stuck on a "connecting" status, it is a good idea to check whether the MQTT authentication flow is still in place. If it is missing, you can download it here: mqttAuthenticationFlow.json. Import this flow into your Node-RED instance, update the Users node with your preferred passwords, and remove any unnecessary comments as needed.