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<title>MQTT Binary Sensor - Home Assistant</title>
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<meta name="description" content="Instructions how to integrate MQTT binary sensors within Home Assistant.">
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MQTT Binary Sensor
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<p>The <code>mqtt</code> binary sensor platform uses the MQTT message payload as the sensor value. If messages in this <code>state_topic</code> are published with <em>RETAIN</em> flag, the sensor will receive an instant update with the last known value. Otherwise, the initial state will be off.</p>
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<p>To use your MQTT binary sensor in your installation, add the following to your <code>configuration.yaml</code> file:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="comment"># Example configuration.yml entry</span>
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<span class="key">binary_sensor</span>:
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<span class="key">platform</span>: <span class="string"><span class="content">mqtt</span></span>
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<span class="key">state_topic</span>: <span class="string"><span class="delimiter">"</span><span class="content">home-assistant/window/contact</span><span class="delimiter">"</span></span>
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<span class="key">name</span>: <span class="string"><span class="delimiter">"</span><span class="content">MQTT Sensor</span><span class="delimiter">"</span></span>
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<span class="key">qos</span>: <span class="string"><span class="content">0</span></span>
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<span class="key">payload_on</span>: <span class="string"><span class="delimiter">"</span><span class="content">ON</span><span class="delimiter">"</span></span>
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<span class="key">payload_off</span>: <span class="string"><span class="delimiter">"</span><span class="content">OFF</span><span class="delimiter">"</span></span>
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<span class="key">sensor_class</span>: <span class="string"><span class="content">opening</span></span>
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<span class="key">value_template</span>: <span class="string"><span class="content">'{{ value.x }}'</span></span>
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</pre></div>
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</div>
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</div>
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<p>Configuration variables:</p>
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<ul>
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<li><strong>state_topic</strong> (<em>Required</em>): The MQTT topic subscribed to receive sensor values.</li>
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<li><strong>name</strong> (<em>Optional</em>): The name of the sensor. Default is ‘MQTT Sensor’.</li>
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<li><strong>qos</strong> (<em>Optional</em>): The maximum QoS level of the state topic. Default is 0.</li>
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<li><strong>payload_on</strong> (<em>Optional</em>): The payload that represents on state. Default is “ON”.</li>
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<li><strong>payload_off</strong> (<em>Optional</em>): The payload that represents state. Default is “OFF”.</li>
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<li><strong>sensor_class</strong> (<em>Optional</em>): The <a href="/components/binary_sensor/">type/class</a> of the sensor to set the icon in the frontend.</li>
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<li><strong>value_template</strong> (<em>Optional</em>): Defines a <a href="/topics/templating/">template</a> to extract a value from the payload.</li>
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</ul>
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<p>For a quick check you can use the commandline tools shipped with <code>mosquitto</code> to send MQTT messages. Set the state of your sensor manually:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre>$ mosquitto_pub -h 127.0.0.1 -t home-assistant/window/contact -m "OFF"
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</pre></div>
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.io/tree/master/source/_components/binary_sensor.mqtt.markdown'>Edit this page on GitHub</a></div>
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<div class='brand-logo-container section'>
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<img src='/images/supported_brands/mqtt.png' />
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<div class='section'>
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<h1 class='title delta'>Related components</h1>
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<ul class='divided'>
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<li><a href='/components/mqtt/'>
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MQTT
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</a></li>
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<li><a href='/components/alarm_control_panel.mqtt/'>
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MQTT Alarm Control Panel
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</a></li>
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<li><a href='/components/device_tracker.mqtt/'>
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MQTT Device Tracker
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</a></li>
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<li><a href='/components/garage_door.mqtt/'>
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MQTT Garage door
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</a></li>
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<li><a href='/components/light.mqtt/'>
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MQTT Light
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</a></li>
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<li><a href='/components/lock.mqtt/'>
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MQTT Lock
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</a></li>
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<li><a href='/components/notify.mqtt/'>
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MQTT Notifications
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</a></li>
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<li><a href='/components/rollershutter.mqtt/'>
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MQTT Rollershutter
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</a></li>
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<li><a href='/components/sensor.mqtt/'>
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MQTT Sensor
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</a></li>
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<li><a href='/components/switch.mqtt/'>
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MQTT Switch
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</a></li>
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</ul>
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</div>
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<div class='section'>
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<h1 class="title delta">Category Binary Sensor</h1>
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<ul class='divided'>
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<li>
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<a href='/components/binary_sensor.apcupsd/'>APCUPSd Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.bloomsky/'>BloomSky Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.command_line/'>Command line Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.http/'>HTTP Binary Sensor</a>
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</li>
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<li>
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MQTT Binary Sensor
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</li>
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<li>
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<a href='/components/binary_sensor.mysensors/'>MySensors Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.nx584/'>NX584 zones</a>
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</li>
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<li>
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<a href='/components/binary_sensor.nest/'>Nest Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.rest/'>RESTful Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.tcp/'>TCP Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.template/'>Template Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.vera/'>Vera Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.wink/'>Wink Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.zwave/'>Z-Wave Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.zigbee/'>ZigBee Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.arest/'>aREST Binary Sensor</a>
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</li>
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</ul>
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</div>
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</section>
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