docs(z2m): add information about MQTT plugin

docs/others/integrations.md

@@ -7,6 +7,7 @@ Integrations is a way to abstract the logic from the event extraction in Control
 
 - **`state`** : Listens for the state of a sensor and the action is fired with the changed event. It does not have any additional arguments.
 - **`z2m`** : This integration is for zigbee2mqtt. This integration allows 2 modes of controller pairing: `ha` or `mqtt`. With `ha` you will need to specify the sensor entity from Home Assistant, like the following:
+
 ```yaml
 example_app:
   module: controllerx
@@ -17,7 +18,9 @@ example_app:
     type: ha
   light: light.example_light
 ```
+
 Note that this is the same as:
+
 ```yaml
 example_app:
   module: controllerx
@@ -26,7 +29,9 @@ example_app:
   integration: z2m
   light: light.example_light
 ```
+
 because `state` takes by default `ha`. Then, if you want to use the MQTT integration, then you will need to specify the **friendly name** of the device from Zigbee2MQTT on the `controller` attribute:
+
 ```yaml
 example_app:
   module: controllerx
@@ -37,7 +42,21 @@ example_app:
     state: mqtt
   light: light.example_light
 ```
-This example shows the default friendly name of the device, but user might change it. ControllerX listens for `zigbee2mqtt/<controller>/action` topic.
+
+This example shows the default friendly name of the device, but user might change it. ControllerX listens for `zigbee2mqtt/<controller>/action` topic. Last but not least, MQTT needs to be configured on `appdaemon.yaml` by adding the `MQTT` plugin, apart from the `HASS` plugin:
+
+```yaml
+plugins:
+  HASS:
+    type: hass
+  MQTT:
+    type: mqtt
+    namespace: mqtt
+    client_host: <Host without indicating the port (e.g. 192.168.1.10)>
+    client_user: XXXXX
+    client_password: XXXXX
+```
+
 - **`deconz`** : It listens to events and actions gets fired by default with the `event` attribute from the `data` object. However, you can change the attribute to listen to by adding a `type` attribute. This is an example
 
 ```yaml