MQTT not recognising Mosquitto Broker

[jimford]

I’ve got MQTT installed and Mosquitto Broker, but if I fill in ‘mosquitto’ in the MQTT configuration it’s not recognised.

I’d be grateful for some help, please!

Jim

(I had a HA installation a few years ago, but configuration of some integrations in the latest incarnation seems more trickiy!)

[steev (Steven Davies)]

You need to put the hostname/IP address of the computer running Moquitto in the MQTT configuration.

[avd706]

Isn’t it core-mosquitto ?

[mobile.andrew.jones (Andrew Jones)]

it’s safer, and doesn’t rely on DNS / mDNS working properly - to just use localhost if it’s running on the same machine.

[FloatingBoater (James Derrick)]

A few ideas to try:

• The Mosquitto broker log shows all connection attempts
  http://homeassistant.local:8123/hassio/addon/core_mosquitto/logs
• Try IPv4 addresses, not hostnames as HASS IPv6 doesn’t work . The post includes test commands to try.
• Have you installed… (in order)
  • Mosquitto broker Add-on (easy to get confused with the…)
  • MQTT integration (for SetOption 19 1 - old HASS discovery)
  • Tasmota integration (for SetOption 19 0 - new Tasmota discovery)
• Try installing a MQTT analyser on another machine and see if that connects
  https://mqtt-explorer.com/
• Read this MQTT step-by-step tutorial written for another question

If this helps, this post!

[jimford]

localhost did it (why isn’t it in the docs?)

Thanks “Ander Jones” and others who made suggestions.

Jim