Add component collection

source/_components/sensor.mqtt.markdown

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+---
+layout: page
+title: "MQTT Sensor support"
+description: "Instructions how to integrate MQTT sensors within Home Assistant."
+date: 2015-05-30 23:21
+sidebar: false
+comments: false
+sharing: true
+footer: true
+logo: mqtt.png
+ha_category: Sensor
+---
+
+<img src='/images/supported_brands/mqtt.png' class='brand pull-right' />
+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.
+
+```yaml
+# Example configuration.yml entry
+sensor:
+  platform: mqtt
+  state_topic: "home/bedroom/temperature"
+  name: "MQTT Sensor"
+  qos: 0
+  unit_of_measurement: "°C"
+```
+
+Configuration variables:
+
+- **state_topic** (*Required*): The MQTT topic subscribed to receive sensor values.
+- **name** (*Optional*): The name of the sensor. Default is 'MQTT Sensor'. 
+- **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.