[SOLVED] MQTT Brokers - Mosquitto vs Imbedded Broker

Newbie here running Openhab 2.4 on Raspberry PI. After reading thru hundreds of posts, I’m still trying to sort out the MQTT business and I’m confused on the following:

  • I installed Mosquitto from the Openhab-config menu - does that mean I don’t need to install another MQTT broker via the paper UI? Is that correct?
  • Is Mosquitto a replacement for the MQTT Broker shown in the Paper UI bindings screen, or supplemental?
  • What is the “embedded MQTT Broker” - a built-in broker that comes with Openhab 2.4? If installed, do I need Mosquitto?

Thanks.

Correct. You need one or the other, not both.

Replacement.

Yes, it’s a built in broker. If you use it you do not need Mosquitto.

This is true in general and especially true with MQTT, understanding how the technology works at a basic level is important to your success with using it with openHAB. I recommend reviewing https://www.hivemq.com/blog/mqtt-essentials-part-1-introducing-mqtt/ to get a basic understanding about how MQTT works. That will help you answer questions like these and help you understand what you need to do with openHAB to make it work.