Can't seem to get Hass.io and SmartThings (MQTT) working

I wrote a guide a long time ago that might help you out. I wrote this back when I started using Home Assistant so my explanations may not be correct, but the guide helped people to get their bridge working. It’s on this post:

  1. Both MQTT broker and bridge need to be running. Smartthings SmartApp talks to the bridge, which talks to the MQTT broker, which talks to Home Assistant, and vice versa.
  2. They should be running on separate ports. Making sure ports are listed correctly in the config of the add-ons is very very important.