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home-assistant.io/source/_components/mqtt.markdown
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MQTT Instructions on how to setup MQTT within Home Assistant. mqtt.png
Hub
true pre 0.7 Local Push

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.

Your first step to get MQTT and Home Assistant working is to choose a broker.

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

To connect to your own MQTT broker:

# Example configuration.yaml entry
mqtt:
  broker: IP_ADDRESS_BROKER

You can also use the embedded MQTT broker. A separate broker is advised for more stability.

As of release 0.92, the embedded broker has been marked as deprecated. This means bugs may not be fixed, and the broker functionality will be removed in a future release. 
# Example configuration.yaml entry
mqtt:
  password: hello

This allows you to connect to the MQTT broker with user homeassistant and password hello.

Additional features