Install MQTT in Home-Assistant

Go to Settings –> Add-on –Add-on Store and search for MQTT

Click on Mosquitto broker, then click install

Select Start on boot and Watchdog, nothing need to be done in the configuration tab so just click Start.

You now need to add a mqtt user

Go to Settings –> People Users Tab.

Click Add User at the bottom right.

Enter Display Name, Username, Password, and Can only log in from the local network.

If you want to test it is working then download MQTT Explorer from HERE.

Enter the IP Address of Home-Assistant, the username, and the password you created above

The only thing available is $sys

After setting up MQTT remember to add it to Home-Assistant

If you reboot the system it should be automatically discovered

Click Notifications

Click Check it out

Click Configure

Click Submit

Any new devices that have updated MQTT will now try to be added, you need to assign them to area and click finish