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

This documentation is part of the MQTT Server guide. You can view the complete guide here: How to connect Node-RED to the Mosquitto MQTT server.

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If you're just getting started with MQTT in Node-RED, here's a straightforward example to help you get up and running quickly. This example demonstrates 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 in the "connecting" state, it's a good idea to check if the MQTT authentication flow is still present. If it's missing, you can download it here: mqttAuthenticationFlow.json. Import this flow into your Node-RED instance, update the Users node with your chosen passwords, and remove any unnecessary comments as needed.