home-assistant.io/source/_integrations/device_tracker.mqtt.markdown

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---
title: "MQTT Device Tracker"
description: "Instructions on how to use MQTT to track devices in Home Assistant."
ha_category:
- Presence Detection
ha_iot_class: Configurable
ha_release: 0.7.3
ha_domain: mqtt
---
The `mqtt` device tracker platform allows you to detect presence by monitoring an MQTT topic for new locations. To use this platform, you specify a unique topic for each device.
## Configuration
To use this device tracker in your installation, add the following to your `configuration.yaml` file:
```yaml
# Example configuration.yaml entry
device_tracker:
- platform: mqtt
devices:
paulus_oneplus: 'location/paulus'
annetherese_n4: 'location/annetherese'
```
{% configuration %}
devices:
description: List of devices with their topic.
required: true
type: list
qos:
description: The QoS level of the topic.
required: false
type: integer
payload_home:
description: The payload value that represents the 'home' state for the device.
required: false
type: string
default: 'home'
payload_not_home:
description: The payload value that represents the 'not_home' state for the device.
required: false
type: string
default: 'not_home'
source_type:
description: Attribute of a device tracker that affects state when being used to track a [person](/integrations/person/). Valid options are `gps`, `router`, `bluetooth`, or `bluetooth_le`.
required: false
type: string
{% endconfiguration %}
## Complete example configuration
```yaml
# Complete configuration.yaml entry
device_tracker:
- platform: mqtt
devices:
paulus_oneplus: 'location/paulus'
annetherese_n4: 'location/annetherese'
qos: 1
payload_home: 'present'
payload_not_home: 'not present'
source_type: bluetooth
```
## Usage
Example JSON you can publish to the topic (e.g., via mqtt.publish service):
```json
{
"topic": "location/paulus",
"payload": "home"
}
```