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MQTT Binary Sensor
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<p>The <code class="highlighter-rouge">mqtt</code> binary sensor platform uses the MQTT message payload as the sensor value. If messages in this <code class="highlighter-rouge">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 class="highlighter-rouge">configuration.yaml</code> file:</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yml entry</span>
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<span class="s">binary_sensor</span><span class="pi">:</span>
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<span class="pi">-</span> <span class="s">platform</span><span class="pi">:</span> <span class="s">mqtt</span>
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<span class="s">state_topic</span><span class="pi">:</span> <span class="s2">"</span><span class="s">home-assistant/window/contact"</span>
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</code></pre>
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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 class="highlighter-rouge">mosquitto</code> to send MQTT messages. Set the state of a sensor manually:</p>
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<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="gp">$ </span>mosquitto_pub -h 127.0.0.1 -t home-assistant/window/contact -m <span class="s2">"OFF"</span>
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</code></pre>
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</div>
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<p>An extended configuration for the same sensor could look like this if you want/need to be more specific.</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yml entry</span>
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<span class="s">binary_sensor</span><span class="pi">:</span>
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<span class="s">platform</span><span class="pi">:</span> <span class="s">mqtt</span>
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<span class="s">state_topic</span><span class="pi">:</span> <span class="s2">"</span><span class="s">home-assistant/window/contact"</span>
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<span class="s">name</span><span class="pi">:</span> <span class="s2">"</span><span class="s">Windows</span><span class="nv"> </span><span class="s">contact"</span>
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<span class="s">qos</span><span class="pi">:</span> <span class="s">0</span>
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<span class="s">payload_on</span><span class="pi">:</span> <span class="s2">"</span><span class="s">1"</span>
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<span class="s">payload_off</span><span class="pi">:</span> <span class="s2">"</span><span class="s">0"</span>
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<span class="s">sensor_class</span><span class="pi">:</span> <span class="s">opening</span>
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<span class="s">value_template</span><span class="pi">:</span> <span class="s1">'</span><span class="s">{{</span><span class="nv"> </span><span class="s">value.x</span><span class="nv"> </span><span class="s">}}'</span>
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</code></pre>
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.github.io/tree/current/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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IoT class<sup><a href='/blog/2016/02/12/classifying-the-internet-of-things/#classifiers'><i class="icon-info-sign"></i></a></sup>: Depends
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</div>
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<div class='section'>
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Introduced in release: 0.9
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</div>
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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/cover.mqtt/'>
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MQTT Cover
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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/fan.mqtt/'>
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MQTT Fan
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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.concord232/'>Concord232 Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.ecobee/'>Ecobee Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.enocean/'>EnOcean Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.envisalink/'>Envisalink Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.ffmpeg/'>FFmpeg 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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<a href='/components/binary_sensor.homematic/'>Homematic Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.isy994/'>ISY994 Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.knx/'>KNX 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.modbus/'>Modbus Binary Sensor</a>
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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.netatmo/'>Netatmo Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.octoprint/'>OctoPrint 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.rpi_gpio/'>Raspberry PI GPIO Binary Sensor</a>
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</li>
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<li>
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<a href='/components/binary_sensor.sleepiq/'>SleepIQ 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.trend/'>Trend 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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