home-assistant.io/source/_components/mqtt.markdown

---
layout: component
title: "MQTT"
description: "Instructions how to setup MQTT within Home Assistant."
date: 2015-08-07 18:00
sidebar: true
comments: false
sharing: true
footer: true
logo: mqtt.png
ha_category: Hub
featured: true
---

MQTT (aka MQ Telemetry Transport) is a machine-to-machine or "Internet of Things" connectivity protocol on top of TCP/IP. It allows extremely lightweight publish/subscribe messaging transport.

To integrate MQTT into Home Assistant, add the following section to your `configuration.yaml` file:

```yaml
# Example configuration.yaml entry
mqtt:
  broker: IP_ADDRESS_BROKER
  port: 1883
  client_id: home-assistant-1
  keepalive: 60
  username: USERNAME
  password: PASSWORD
  certificate: /home/paulus/dev/addtrustexternalcaroot.crt
```

Configuration variables:

- **broker** (*Required*): The IP address of your MQTT broker, e.g. 192.168.1.32.
- **port** (*Optional*): The network port to connect to. Default is 1883.
- **client_id** (*Optional*): Client ID that Home Assistant will use. Has to be unique on the server. Default is a random generated one.
- **keepalive** (*Optional*): The keep alive in seconds for this client. Default is 60.
- **username** (*Optional*): The username to use with your MQTT broker.
- **password** (*Optional*): The corresponding password for the username to use with your MQTT broker.
- **certificate** (*Optional*): Certificate to use to encrypt communication with the broker.

## {% linkable_title Picking a broker %}

The MQTT component needs you to run an MQTT broker for Home Assistant to connect to. There are three options, each with various degrees of ease of setup and privacy.

#### {% linkable_title Run your own %}

Most private option but requires a bit more work. There are two free and open-source brokers to pick from: [Mosquitto](http://mosquitto.org/) and [Mosca](http://www.mosca.io/).

```yaml
# Example configuration.yaml entry
mqtt:
  broker: 192.168.1.100
  port: 1883
  client_id: home-assistant-1
  keepalive: 60
  username: USERNAME
  password: PASSWORD
```

#### {% linkable_title Public MQTT %}

The Mosquitto project runs a [public broker](http://test.mosquitto.org). Easiest to setup but there is 0 privacy as all messages are public. Use this only for testing purposes and not for real tracking of your devices.

```yaml
mqtt:
  broker: test.mosquitto.org
  port: 1883

  # Optional, if you want encryption
  # (doesn't really matter because broker is public)
  port: 8883
  # Download certificate from http://test.mosquitto.org/ssl/mosquitto.org.crt
  certificate: /home/paulus/downloads/mosquitto.org.crt
```

#### {% linkable_title CloudMQTT %}

[CloudMQTT](https://www.cloudmqtt.com) is a hosted private MQTT instance that is free up to 10 connected devices. This is enough to get started with for example [OwnTracks](/components/device_tracker.owntracks/) and give you a taste of what is possible.

<p class='note'>
Home Assistant is not affiliated with CloudMQTT nor will receive any kickbacks.
</p>

 1. [Create an account](https://customer.cloudmqtt.com/login) (no payment details needed)
 2. [Create a new CloudMQTT instance](https://customer.cloudmqtt.com/subscription/create)
    (Cute Cat is the free plan)
 3. From the control panel, click on the _Details_ button.
 4. Create unique users for Home Assistant and each phone to connect<br>(CloudMQTT does not allow two
    connections from the same user)
      a. Under manage users, fill in username, password and click add
      b. Under ACLs, select user, topic `#`, check 'read access' and 'write access'
 5. Copy the instance info to your configuration.yaml:

```yaml
mqtt:
  broker: <Server>
  port: <SSL Port>
  username: <User>
  password: <Password>
```

<p class='note'>
Home Assistant will automatically load the correct certificate if you connect to an encrypted channel of CloudMQTT (port range 20 000 - 30 000).
</p>

## {% linkable_title Building on top of MQTT %}

 - [MQTT Sensor](/components/sensor.mqtt/)
 - [MQTT Switch](/components/switch.mqtt/)
 - [MQTT Device Tracker](/components/device_tracker.mqtt/)
 - [OwnTracks Device Tracker](/components/device_tracker.owntracks/)
 - [MQTT automation rule](/components/automation/#mqtt-based-automation)
 - [MQTT alarm](/components/alarm_control_panel.mqtt/)
 - Integrating it into own component. See the [MQTT example component](https://github.com/balloob/home-assistant/blob/dev/config/custom_components/mqtt_example.py) how to do this.

## {% linkable_title Testing your setup %}

For debugging purposes `mosquitto` is shipping commandline tools to send and recieve MQTT messages. For sending test messages to a broker running on localhost:

```bash
$ mosquitto_pub -h 127.0.0.1 -t home-assistant/switch/1/on -m "Switch is ON"
```

Another way to send MQTT messages by hand is to use the "Developer Tools" in the Frontend. Choose "Call Service" and then `mqtt/mqtt_send` under "Available Services". Enter something similar to the example below into the "Service Data" field.

```json
{
   "topic":"home-assistant/switch/1/on",
   "payload":"Switch is ON"
}
```

The message should appear on the bus:

```bash
... [homeassistant] Bus:Handling <Event MQTT_MESSAGE_RECEIVED[L]: topic=home-assistant/switch/1/on, qos=0, payload=Switch is ON>
```

For reading all messages sent on the topic `home-assistant` to a broker running on localhost:

```bash
$ mosquitto_sub -h 127.0.0.1 -v -t "home-assistant/#"
```