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<title>MQTT sensor - Home Assistant</title>
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<meta name="author" content="Paulus Schoutsen">
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<meta name="description" content="Instructions how to integrate MQTT sensors within Home Assistant.">
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<img width='40' src='/images/favicon-192x192.png'> Home Assistant
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<li><a href='/getting-started/'>Installing Home Assistant</a></li>
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MQTT sensor
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</h1>
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<p>This MQTT sensor implementation uses the MQTT message payload as the sensor value. If messages in this state_topic are published with <em>RETAIN</em> flag, the sensor will receive an instant update with last known value. Otherwise, the initial state will be undefined.</p>
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<p>To use your MQTT 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">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/bedroom/temperature</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">unit_of_measurement</span>: <span class="string"><span class="delimiter">"</span><span class="content">°C</span><span class="delimiter">"</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>unit_of_measurement</strong> (<em>Optional</em>): Defines the units of measurement of the sensor, if any.</li>
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</ul>
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</article>
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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>
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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/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 Sensor</h1>
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<ul class='divided'>
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<li>
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<a href='/components/sensor.bitcoin/'>Bitcoin</a>
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</li>
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<li>
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<a href='/components/sensor.cpuspeed/'>CPU speed</a>
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</li>
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<li>
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<a href='/components/sensor.command_sensor/'>Command line sensor</a>
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</li>
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<li>
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<a href='/components/sensor.efergy/'>Efergy sensor</a>
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</li>
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<li>
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<a href='/components/sensor.glances/'>Glances</a>
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</li>
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<li>
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MQTT sensor
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</li>
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<li>
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<a href='/components/sensor.modbus/'>Modbus sensor</a>
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</li>
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<li>
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<a href='/components/sensor.mysensors/'>MySensors sensor</a>
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</li>
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<li>
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<a href='/components/sensor.rest/'>RESTful sensor</a>
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</li>
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<li>
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<a href='/components/sensor.rfxtrx/'>RFXtrx sensor</a>
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</li>
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<li>
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<a href='/components/sensor.sabnzbd/'>SABnzbd</a>
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</li>
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<li>
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<a href='/components/sensor.swiss_public_transport/'>Swiss Public Transport</a>
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</li>
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<li>
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<a href='/components/sensor.systemmonitor/'>System Monitor</a>
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</li>
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<li>
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<a href='/components/sensor.temper/'>TEMPer sensor</a>
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</li>
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<li>
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<a href='/components/sensor.tellstick/'>TellStick sensor</a>
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</li>
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<li>
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<a href='/components/sensor.time_date/'>Time & Date</a>
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</li>
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<li>
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<a href='/components/sensor.transmission/'>Transmission sensor</a>
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</li>
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<li>
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<a href='/components/sensor.vera/'>Vera sensor</a>
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</li>
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<li>
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<a href='/components/sensor.wink/'>Wink sensor</a>
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</li>
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<li>
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<a href='/components/sensor.worldclock/'>Worldclock</a>
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</li>
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<li>
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<a href='/components/sensor.arest/'>aREST 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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</div>
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