---
layout: page
title: "MQTT Switch"
description: "Instructions on 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 lets you control your MQTT enabled switches.

In an ideal scenario, the MQTT device will have a `state_topic` to publish state changes. If these messages are published with a `RETAIN` flag, the MQTT switch will receive an instant state update after subscription, and will start with the 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 the device (message from `state_topic`).

Optimistic mode can be forced, even if the `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 %}
name:
  description: The name to use when displaying this switch.
  required: false
  type: string
  default: MQTT Switch
icon:
  description: Icon for the switch (e.g. `mdi:radiator`).
  required: false
  type: string
state_topic:
  description: The MQTT topic subscribed to receive state updates.
  required: false
  type: string
command_topic:
  description: The MQTT topic to publish commands to change the switch state.
  required: false
  type: string
availability_topic:
  description: The MQTT topic subscribed to receive availability (online/offline) updates.
  required: false
  type: string
payload_on:
  description: The payload that represents enabled state.
  required: false
  type: string
  default: ON
payload_off:
  description: The payload that represents disabled state.
  required: false
  type: string
  default: OFF
payload_available:
  description: The payload that represents the available state.
  required: false
  type: string
  default: online
payload_not_available:
  description: The payload that represents the unavailable state.
  required: false
  type: string
  default: offline
optimistic:
  description: Flag that defines if switch works in optimistic mode.
  required: false
  type: boolean
  default: "`true` if no `state_topic` defined, else `false`."
qos:
  description: The maximum QoS level of the state topic. Default is 0 and will also be used to publishing messages.
  required: false
  type: integer
  default: 0
retain:
  description: If the published message should have the retain flag on or not.
  required: false
  type: boolean
  default: false
value_template:
  description: "Defines a [template](/docs/configuration/templating/#processing-incoming-data) to extract a value from the payload."
  required: false
  type: string
{% endconfiguration %}

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

## {% linkable_title Examples %}

In this section you will 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"
```

### {% linkable_title Set the state of a device with ESPEasy %}

Assuming that you have flashed your ESP8266 unit with [ESPEasy](https://github.com/letscontrolit/ESPEasy). Under "Config" is a name ("Unit Name:") set for your device (here it's "bathroom"). A configuration for a "Controller" for MQTT with the protocol "OpenHAB MQTT" is present and the entries ("Controller Subscribe:" and "Controller Publish:") are adjusted to match your needs. In this example the topics are prefixed with "home". There is no further configuration needed as the [GPIOs](https://www.letscontrolit.com/wiki/index.php/GPIO) can be controlled with MQTT directly.

Manually you can set pin 13 to high with `mosquitto_pub` or another MQTT tool:

```bash
$ mosquitto_pub -h 127.0.0.1 -t home/bathroom/gpio/13 -m "1"
```

The configuration will look like the example below:

{% raw %}
```yaml
# Example configuration.yml entry
switch:
  - platform: mqtt
    name: bathroom
    state_topic: "home/bathroom/gpio/13"
    command_topic: "home/bathroom/gpio/13"
    payload_on: "1"
    payload_off: "0"
```
{% endraw %}

