old_contents: # -*- coding: utf-8 -*-
  """
  homeassistant.components.sensor.mqtt
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Allows to configure a MQTT sensor.
  
  This generic sensor implementation uses the MQTT message payload
  as the sensor value. If messages in this state_topic are published
  with RETAIN flag, the sensor will receive an instant update with
  last known value. Otherwise, the initial state will be undefined.
  
  sensor:
    platform: mqtt
    name: "MQTT Sensor"
    state_topic: "home/bedroom/temperature"
    qos: 0
    unit_of_measurement: "ºC"
  
  Variables:
  
  name
  *Optional
  The name of the sensor. Default is 'MQTT Sensor'.
  
  state_topic
  *Required
  The MQTT topic subscribed to receive sensor values.
  
  qos
  *Optional
  The maximum QoS level of the state topic. Default is 0.
  
  unit_of_measurement
  *Optional
  Defines the units of measurement of the sensor, if any.
  
  """
  
  import logging
  from homeassistant.helpers.entity import Entity
  import homeassistant.components.mqtt as mqtt
  
  _LOGGER = logging.getLogger(__name__)
  
  DEFAULT_NAME = "MQTT Sensor"
  DEFAULT_QOS = 0
  
  DEPENDENCIES = ['mqtt']
  
  
  # pylint: disable=unused-argument
  def setup_platform(hass, config, add_devices_callback, discovery_info=None):
      """ Add MQTT Sensor """
  
      if config.get('state_topic') is None:
          _LOGGER.error("Missing required variable: state_topic")
          return False
  
      add_devices_callback([MqttSensor(
          hass,
          config.get('name', DEFAULT_NAME),
          config.get('state_topic'),
          config.get('qos', DEFAULT_QOS),
          config.get('unit_of_measurement'))])
  
  
  # pylint: disable=too-many-arguments, too-many-instance-attributes
  class MqttSensor(Entity):
      """ Represents a sensor that can be updated using MQTT """
      def __init__(self, hass, name, state_topic, qos, unit_of_measurement):
          self._state = "-"
          self._hass = hass
          self._name = name
          self._state_topic = state_topic
          self._qos = qos
          self._unit_of_measurement = unit_of_measurement
  
          def message_received(topic, payload, qos):
              """ A new MQTT message has been received. """
              self._state = payload
              self.update_ha_state()
  
          mqtt.subscribe(hass, self._state_topic, message_received, self._qos)
  
      @property
      def should_poll(self):
          """ No polling needed """
          return False
  
      @property
      def name(self):
          """ The name of the sensor """
          return self._name
  
      @property
      def unit_of_measurement(self):
          """ Unit this state is expressed in. """
          return self._unit_of_measurement
  
      @property
      def state(self):
          """ Returns the state of the entity. """
          return self._state
  
new_contents: """
  homeassistant.components.sensor.mqtt
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Allows to configure a MQTT sensor.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/sensor.mqtt.html
  """
  
  import logging
  from homeassistant.helpers.entity import Entity
  import homeassistant.components.mqtt as mqtt
  
  _LOGGER = logging.getLogger(__name__)
  
  DEFAULT_NAME = "MQTT Sensor"
  DEFAULT_QOS = 0
  
  DEPENDENCIES = ['mqtt']
  
  
  # pylint: disable=unused-argument
  def setup_platform(hass, config, add_devices_callback, discovery_info=None):
      """ Add MQTT Sensor. """
  
      if config.get('state_topic') is None:
          _LOGGER.error("Missing required variable: state_topic")
          return False
  
      add_devices_callback([MqttSensor(
          hass,
          config.get('name', DEFAULT_NAME),
          config.get('state_topic'),
          config.get('qos', DEFAULT_QOS),
          config.get('unit_of_measurement'))])
  
  
  # pylint: disable=too-many-arguments, too-many-instance-attributes
  class MqttSensor(Entity):
      """ Represents a sensor that can be updated using MQTT. """
      def __init__(self, hass, name, state_topic, qos, unit_of_measurement):
          self._state = "-"
          self._hass = hass
          self._name = name
          self._state_topic = state_topic
          self._qos = qos
          self._unit_of_measurement = unit_of_measurement
  
          def message_received(topic, payload, qos):
              """ A new MQTT message has been received. """
              self._state = payload
              self.update_ha_state()
  
          mqtt.subscribe(hass, self._state_topic, message_received, self._qos)
  
      @property
      def should_poll(self):
          """ No polling needed """
          return False
  
      @property
      def name(self):
          """ The name of the sensor """
          return self._name
  
      @property
      def unit_of_measurement(self):
          """ Unit this state is expressed in. """
          return self._unit_of_measurement
  
      @property
      def state(self):
          """ Returns the state of the entity. """
          return self._state
  
subject: Remove configuration details