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 ## MQTT on Hassio
 
-PLACEHOLDER
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+Assuming you have [Hassio installed](https://www.home-assistant.io/getting-started/) (on a raspberry Pi3 for example). You will find the [official MQTT broker](https://www.home-assistant.io/docs/mqtt/broker/) documentation lacking in that small amount of detail that will get you up and running. This section is supposed to help take you that final mile.
+
+### The MQTT Broker
+
+Let's start assuming you are going to use the downloadable [MQTT broker](https://www.home-assistant.io/addons/mosquitto/) from the add-on store. You will also want to have the [configurator package](https://www.home-assistant.io/addons/configurator) installed too. Open up the configurator web-gui and find your `/config/configuration.yaml` file and addc the following entry at the bottom of the file:
+
+```yaml
+#MQTT Setup
+mqtt:
+ broker: 0.0.0.0
+ port: 1883
+```
+
+This will ensure that your broker properly configured. Now just make sure that you set the `Start on boot` to True in the addon details and restart your home-assistant.
+
+### An MQTT Sensor
+
+Once again you may be a little confused by the official documentation for setting up an [MQTT sensor](https://www.home-assistant.io/components/sensor.mqtt/). Assuming you are using the sample photoresitor light sensor that is included in this repo. Go back to your `/config/configuration.yaml` and this entry:
+
+```yaml
+#MQTT Light Sensor
+sensor office_light:
+  - platform: mqtt
+    name: "Office Light"
+    unit_of_measurement: "No."
+    # Note your esp8266 will have a different MAC id. You can find the sensor's full topic path in the logs of the MQTT add-on
+    state_topic: "light/esp8266_aa00f800"
+    # Our json is a simple single value extracted with this jinja2 template
+    # More templating info can be found here https://www.home-assistant.io/docs/configuration/templating/#processing-incoming-data
+    value_template: "{{value_json.payload}}"
+    # Material design icons https://cdn.materialdesignicons.com/2.3.54/
+    icon: mdi:lightbulb-on-outline
+```
+
+This should create an MQTT sensor that you will find on your Overview homepage after you restart the Hassio server.
+
+### Testing your new topic
+
+Let's assume you haven't built the ESP8266 sensor. You can still test your service through the Hassio Developer tools at `http://hassio:8123/dev-service`. Select `mqtt.publish` as just craft a simple payload. Once you call the service you should see the result in the Sensor's component on your Overview
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