My last configuration.yaml file for my Home Assistant setup (HA, HASS)

configuration

homeassistant:
  # Name of the location where Home Assistant is running
  name: Home
  # Location required to calculate the time the sun rises and sets
  latitude: ******
  longitude: ******
  # C for Celcius, F for Fahrenheit
  temperature_unit: C
  # Pick yours from here: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
  time_zone: America/Sao_Paulo

# Show links to resources in log and frontend
# introduction:

# Enables support for tracking state changes over time.
history:

# Checks for available updates
updater:

# View all events in a logbook
logbook:

# Enables the frontend
frontend:

# Allows you to issue voice commands from the frontend
conversation:

# Discover some devices automatically
discovery:

# Track the sun
sun:

# Connects to IFTTT Maker channel
ifttt:
  key: ******

# Configure my Media Player
media_player:
  platform: plex  

# Configuration of the notification system using Pushbullet
notify:
  name: me
  platform: pushbullet
  api_key: ******

# Configurations to connect to my local MQTT broker
mqtt:
  broker: 127.0.0.1
  port: 1883
  client_id: home-assistant

device_tracker:
  platform: owntracks

switch:
  - platform: mqtt
    name: "Main Light"
    state_topic: "home/room/augusto/main_light/status"
    command_topic: "home/room/augusto/main_light/set"
    qos: 0
    payload_on: "ON"
    payload_off: "OFF"
    optimistic: false
    retain: True
    # value_template: '{{ value.x }}'

  - platform: mqtt
    state_topic: "home/notifications"
    command_topic: "home/notifications"
    name: "Notifications State"
    qos: 0
    payload_on: "ON"
    payload_of: "OFF"
    optimistic: false
    retain: True

  - platform: mqtt
    state_topic: "home/alarm"
    command_topic: "home/alarm"
    name: "Alarm"
    qos: 0
    payload_on: "ON"
    payload_of: "OFF"
    optimistic: false
    retain: True

sensor:
  - platform: mqtt
    state_topic: "home/room/augusto/temperature"
    name: "Augusto's Room Temperature"
    qos: 0
    unit_of_measurement: "°C"
    value_template: '{{ value_json.payload }}'

  - platform: mqtt
    state_topic: "home/room/augusto/luminosity"
    name: "Augusto's Room Luminosity"
    qos: 0
    unit_of_measurement: "cd"
    value_template: '{{ value_json.payload }}'

  - platform: mqtt
    state_topic: "home/livingroom/temperature"
    name: "Living Room Temperature"
    qos: 0
    unit_of_measurement: "°C"
    value_template: '{{  value_json.payload }}'

  - platform: mqtt
    state_topic: "home/livingroom/luminosity"
    name: "Living Room Luminosity"
    qos: 0
    unit_of_measurement: "cd"
    value_template: '{{ value_json.payload }}'

group:
  Configuration:
    - switch.notifications_state
    - switch.alarm
  Augusto:
    - sensor.augustos_room_luminosity
    - sensor.augustos_room_temperature
    - switch.main_light
  Living Room:
    - sensor.living_room_luminosity
    - sensor.living_room_temperature