config.yml

## config.yml
---
mqtt:
    host: 192.168.1.40
port: 8081

preface: smartthings

## configuration.yaml
mqtt:
  discovery: true
  broker: <internal_fqdn_of_broker-maps to 192.168.1.40>

light:
  - platform: mqtt
    name: "Family Room Left"
    state_topic: "smartthings/FamRm Left/light/status"
    command_topic: "smartthings/FamRm Left/light/switch"
    brightness_state_topic: "smartthings/FamRm Left/brightness/status"
    brightness_command_topic: "smartthings/FamRm Left/brightness/set"
    state_value_template: "{{ value_json.state }}"
    brightness_value_template: "{{ value_json.brightness }}"

## mosquitto.conf
persistence true
# this is a docker volume 'mosquitto-data'
persistence_location /mosquitto/data/
# log_dest file /mosquitto/log/mosquitto.log
# can't log local as mosquitto wants to change uid/gid of bind mount