---
layout: page
title: "MQTT Switch"
description: "Instructions how to integrate MQTT switches into Home Assistant."
date: 2015-08-30 23:38
sidebar: true
comments: false
sharing: true
footer: true
logo: mqtt.png
ha_category: Switch
ha_release: 0.7
ha_iot_class: depends
---

The `mqtt` switch platform let you control your MQTT enabled switch.

In an ideal scenario, the MQTT device will have a `state_topic` to publish state changes. If these messages are published with `RETAIN` flag, the MQTT switch will receive an instant state update after subscription and will start with correct state. Otherwise, the initial state of the switch will be false/off.

When a `state_topic` is not available, the switch will work in optimistic mode. In this mode, the switch will immediately change state after every command. Otherwise, the switch will wait for state confirmation from device (message from `state_topic`).

Optimistic mode can be forced, even if state topic is available. Try to enable it, if experiencing incorrect switch operation.

To enable this switch in your installation, add the following to your `configuration.yaml` file:

```yaml
# Example configuration.yml entry
switch:
  - platform: mqtt
    command_topic: "home/bedroom/switch1/set"
```

Configuration variables:

- **name** (*Optional*): The name of the switch. Default is 'MQTT Switch'.
- **state_topic** (*Optional*): The MQTT topic subscribed to receive state updates.
- **command_topic** (*Required*): The MQTT topic to publish commands to change the switch state.
- **availability_topic** (*Optional*): The MQTT topic subscribed to receive availability (online/offline) updates. The payload is the same for the command_topic.
- **payload_on** (*Optional*): The payload that represents enabled state. Default is "ON".
- **payload_off** (*Optional*): The payload that represents disabled state. Default is "OFF".
- **optimistic** (*Optional*): Flag that defines if switch works in optimistic mode. Default is `true` if no `state_topic` defined, else `false`.
- **qos** (*Optional*): The maximum QoS level of the state topic. Default is 0 and will also be used to publishing messages.
- **retain** (*Optional*): If the published message should have the retain flag on or not.
- **value_template** (*Optional*): Defines a [template](/docs/configuration/templating/#processing-incoming-data) to extract a value from the payload.

<p class='note warning'>
Make sure that your topic match exact. `some-topic/` and `some-topic` are different topics.
</p>

## {% linkable_title Examples %}

In this section you find some real life examples of how to use this sensor.

### {% linkable_title Full configuration %}

The example below shows a full configuration for a switch.

```yaml
# Example configuration.yml entry
switch:
  - platform: mqtt
    name: "Bedroom Switch"
    state_topic: "home/bedroom/switch1"
    command_topic: "home/bedroom/switch1/set"
    availability_topic: "home/bedroom/switch1/available"
    payload_on: "ON"
    payload_off: "OFF"
    optimistic: false
    qos: 0
    retain: true
```

For a check you can use the command line tools `mosquitto_pub` shipped with `mosquitto` to send MQTT messages. This allows you to operate your switch manually:

```bash
$  mosquitto_pub -h 127.0.0.1 -t home/bedroom/switch1 -m "ON"
```