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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>
<p>To use your MQTT binary sensor in your installation, add the following to your <code>configuration.yaml</code> file:</p>
<div class="highlighter-coderay"><div class="CodeRay">
<div class="code"><pre><span class="comment"># Example configuration.yml entry</span>
<span class="key">binary_sensor</span>:
<span class="key">platform</span>: <span class="string"><span class="content">mqtt</span></span>
<span class="key">state_topic</span>: <span class="string"><span class="delimiter">&quot;</span><span class="content">home-assistant/window/contact</span><span class="delimiter">&quot;</span></span>
<span class="key">name</span>: <span class="string"><span class="delimiter">&quot;</span><span class="content">MQTT Sensor</span><span class="delimiter">&quot;</span></span>
<span class="key">qos</span>: <span class="string"><span class="content">0</span></span>
<span class="key">payload_on</span>: <span class="string"><span class="delimiter">&quot;</span><span class="content">ON</span><span class="delimiter">&quot;</span></span>
<span class="key">payload_off</span>: <span class="string"><span class="delimiter">&quot;</span><span class="content">OFF</span><span class="delimiter">&quot;</span></span>
<span class="key">value_template</span>: <span class="string"><span class="content">'{{ value.x }}'</span></span>
</pre></div>
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<p>Configuration variables:</p>
<ul>
<li><strong>state_topic</strong> (<em>Required</em>): The MQTT topic subscribed to receive sensor values.</li>
<li><strong>name</strong> (<em>Optional</em>): The name of the sensor. Default is MQTT Sensor.</li>
<li><strong>qos</strong> (<em>Optional</em>): The maximum QoS level of the state topic. Default is 0.</li>
<li><strong>payload_on</strong> (<em>Optional</em>): The payload that represents on state. Default is “ON”.</li>
<li><strong>payload_off</strong> (<em>Optional</em>): The payload that represents state. Default is “OFF”.</li>
<li><strong>value_template</strong> (<em>Optional</em>): Defines a <a href="/topics/templating/">template</a> to extract a value from the payload.</li>
</ul>
<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>
<div class="highlighter-coderay"><div class="CodeRay">
<div class="code"><pre>$ mosquitto_pub -h 127.0.0.1 -t home-assistant/window/contact -m &quot;OFF&quot;
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<h1 class='title delta'>Related components</h1>
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