Let us follow Reduxi Controller - MQTT API technical documentation.
1. Log in to Reduxi Configurator
2. Get credentials of your MQTT broker; for example, you can use EMQX Cloud Console
3. Configure MQTT connection and click Save
4. Please refresh the page to see if the Reduxi Controller did make a successful connection in the background
5. Check MQTT broker statistics to see if everything is working
6. You can now connect to your MQTT broker, receive and use data based on your needs