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 are new to using MQTT with Node-RED, here is a simple example to help you get started 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 is advisable to check whether the MQTT authentication flow is still present. 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 chosen passwords, and remove any unnecessary comments as needed.