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<h1 class="title indent">
MQTT Binary Sensor
</h1>
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<hr class="divider">
<p>The <code class="highlighter-rouge">mqtt</code> binary sensor platform uses an MQTT message payload to set the binary sensor to one of two states: <code class="highlighter-rouge">on</code> or <code class="highlighter-rouge">off</code>.</p>
<p>The binary sensor state will be updated only after a new message is published on <code class="highlighter-rouge">state_topic</code> matching <code class="highlighter-rouge">payload_on</code> or <code class="highlighter-rouge">payload_off</code>. If these messages are published with the <code class="highlighter-rouge">retain</code> flag set, the binary sensor will receive an instant state update after subscription and Home Assistant will display the correct state on startup. Otherwise, the initial state displayed in Home Assistant will be <code class="highlighter-rouge">unknown</code>.</p>
<p>The <code class="highlighter-rouge">mqtt</code> binary sensor platform optionally supports an <code class="highlighter-rouge">availability_topic</code> to receive online and offline messages (birth and LWT messages) from the MQTT device. During normal operation, if the MQTT cover device goes offline (i.e., publishes <code class="highlighter-rouge">payload_not_available</code> to <code class="highlighter-rouge">availability_topic</code>), Home Assistant will display the binary sensor as <code class="highlighter-rouge">unavailable</code>. If these messages are published with the <code class="highlighter-rouge">retain</code> flag set, the binary sensor will receive an instant update after subscription and Home Assistant will display the correct availability state of the binary sensor when Home Assistant starts up. If the <code class="highlighter-rouge">retain</code> flag is not set, Home Assistant will display the binary sensor as <code class="highlighter-rouge">unavailable</code> when Home Assistant starts up. If no <code class="highlighter-rouge">availability_topic</code> is defined, Home Assistant will consider the MQTT device to be available.</p>
<p>To use an MQTT binary sensor in your installation, add the following to your <code class="highlighter-rouge">configuration.yaml</code> file:</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yaml entry</span>
<span class="s">binary_sensor</span><span class="pi">:</span>
<span class="pi">-</span> <span class="s">platform</span><span class="pi">:</span> <span class="s">mqtt</span>
<span class="s">state_topic</span><span class="pi">:</span> <span class="s2">"</span><span class="s">home-assistant/window/contact"</span>
</code></pre>
</div>
<div class="config-vars">
<h3><a class="title-link" name="configuration-variables" href="#configuration-variables"></a> Configuration Variables</h3>
<dl class="">
<dt><a class="title-link" name="name" href="#name"></a> name</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">The name of the binary sensor.</span></p>
<p class="default">Default value: MQTT Binary Sensor</p>
</dd>
<dt><a class="title-link" name="state_topic" href="#state_topic"></a> state_topic</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Required)</span><span class="description">The MQTT topic subscribed to receive sensor values.</span></p>
</dd>
<dt><a class="title-link" name="payload_on" href="#payload_on"></a> payload_on</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">The payload that represents the on state.</span></p>
<p class="default">Default value: true</p>
</dd>
<dt><a class="title-link" name="payload_off" href="#payload_off"></a> payload_off</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">The payload that represents the off state.</span></p>
<p class="default">Default value: false</p>
</dd>
<dt><a class="title-link" name="availability_topic" href="#availability_topic"></a> availability_topic</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">The MQTT topic subscribed to receive birth and LWT messages from the MQTT device. If <code class="highlighter-rouge">availability_topic</code> is not defined, the binary sensor availability state will always be <code class="highlighter-rouge">available</code>. If <code class="highlighter-rouge">availability_topic</code> is defined, the binary sensor availability state will be <code class="highlighter-rouge">unavailable</code> by default.</span></p>
</dd>
<dt><a class="title-link" name="payload_available" href="#payload_available"></a> payload_available</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">The payload that represents the online state.</span></p>
<p class="default">Default value: online</p>
</dd>
<dt><a class="title-link" name="payload_not_available" href="#payload_not_available"></a> payload_not_available</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">The payload that represents the offline state.</span></p>
<p class="default">Default value: offline</p>
</dd>
<dt><a class="title-link" name="qos" href="#qos"></a> qos</dt>
<dd>
<p class="desc"><span class="type">(<span class="integer">integer</span>)</span><span class="required">(Optional)</span><span class="description">The maximum QoS level to be used when receiving messages.</span></p>
<p class="default">Default value: 0</p>
</dd>
<dt><a class="title-link" name="device_class" href="#device_class"></a> device_class</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">The <a href="/components/binary_sensor/">type/class</a> of the sensor to set the icon in the frontend.</span></p>
</dd>
<dt><a class="title-link" name="value_template" href="#value_template"></a> value_template</dt>
<dd>
<p class="desc"><span class="type">(<span class="string">string</span>)</span><span class="required">(Optional)</span><span class="description">Defines a <a href="/docs/configuration/templating/#processing-incoming-data">template</a> to extract a value from the payload.</span></p>
</dd>
<dt><a class="title-link" name="force_update" href="#force_update"></a> force_update</dt>
<dd>
<p class="desc"><span class="type">(<span class="boolean">boolean</span>)</span><span class="description">Sends update events even if the value hasnt changed. Useful if you want to have meaningful value graphs in history.</span></p>
<p class="default">Default value: false</p>
</dd>
</dl>
</div>
<h2><a class="title-link" name="examples" href="#examples"></a> Examples</h2>
<p>In this section, you will find some real-life examples of how to use this sensor.</p>
<h3><a class="title-link" name="full-configuration" href="#full-configuration"></a> Full configuration</h3>
<p>To test, you can use the command line tool <code class="highlighter-rouge">mosquitto_pub</code> shipped with <code class="highlighter-rouge">mosquitto</code> or the <code class="highlighter-rouge">mosquitto-clients</code> package to send MQTT messages. To set the state of the binary sensor manually:</p>
<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>
</code></pre>
</div>
<p>The example below shows a full configuration for a binary sensor:</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yaml entry</span>
<span class="s">binary_sensor</span><span class="pi">:</span>
<span class="pi">-</span> <span class="s">platform</span><span class="pi">:</span> <span class="s">mqtt</span>
<span class="s">name</span><span class="pi">:</span> <span class="s2">"</span><span class="s">Window</span><span class="nv"> </span><span class="s">Contact</span><span class="nv"> </span><span class="s">Sensor"</span>
<span class="s">state_topic</span><span class="pi">:</span> <span class="s2">"</span><span class="s">home-assistant/window/contact"</span>
<span class="s">payload_on</span><span class="pi">:</span> <span class="s2">"</span><span class="s">ON"</span>
<span class="s">payload_off</span><span class="pi">:</span> <span class="s2">"</span><span class="s">OFF"</span>
<span class="s">availability_topic</span><span class="pi">:</span> <span class="s2">"</span><span class="s">home-assistant/window/availability"</span>
<span class="s">payload_available</span><span class="pi">:</span> <span class="s2">"</span><span class="s">online"</span>
<span class="s">payload_not_available</span><span class="pi">:</span> <span class="s2">"</span><span class="s">offline"</span>
<span class="s">qos</span><span class="pi">:</span> <span class="s">0</span>
<span class="s">device_class</span><span class="pi">:</span> <span class="s">opening</span>
<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>
</code></pre>
</div>
<h3><a class="title-link" name="get-the-state-of-a-device-with-espeasy" href="#get-the-state-of-a-device-with-espeasy"></a> Get the state of a device with ESPEasy</h3>
<p>Assuming that you have flashed your ESP8266 unit with <a href="https://github.com/letscontrolit/ESPEasy">ESPEasy</a>. Under “Config” is a name (“Unit Name:”) set for your device (here its “bathroom”). A configuration for a “Controller” for MQTT with the protocol “OpenHAB MQTT” is present and the entries (“Controller Subscribe:” and “Controller Publish:”) are adjusted to match your needs. In this example, the topics are prefixed with “home”. Also, add a “Switch Input” in the “Devices” tap with the name “switch” and “button” as value.</p>
<p>As soon as the unit is online, you will get the state of the attached button.</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code>home/bathroom/status Connected
...
home/bathroom/switch/button 1
</code></pre>
</div>
<p>The configuration will look like the example below:</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yml entry</span>
<span class="s">binary_sensor</span><span class="pi">:</span>
<span class="pi">-</span> <span class="s">platform</span><span class="pi">:</span> <span class="s">mqtt</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">Bathroom</span>
<span class="s">state_topic</span><span class="pi">:</span> <span class="s2">"</span><span class="s">home/bathroom/switch/button"</span>
<span class="s">payload_on</span><span class="pi">:</span> <span class="s2">"</span><span class="s">1"</span>
<span class="s">payload_off</span><span class="pi">:</span> <span class="s2">"</span><span class="s">0"</span>
</code></pre>
</div>
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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 class='section'>
Introduced in release: 0.9
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<div class='section'>
Source:
<a href='https://github.com/home-assistant/home-assistant/blob/master/homeassistant/components/binary_sensor/mqtt.py'>binary_sensor/mqtt.py</a>
</div>
<div class='section'>
This is a platform for
<a href='/components/binary_sensor/'>the Binary Sensor component</a>.
</div>
<div class='section'>
<h1 class='title delta'>Related components</h1>
<ul class='divided'>
<li><a href='/components/mqtt/'>
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<li><a href='/components/light.mqtt/'>
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<li><a href='/components/notify.mqtt/'>
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<div class='section'>
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</li>
<li>
<a href='/components/binary_sensor.gc100/'>gc100 Binary Sensor</a>
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<a href='/components/binary_sensor.mystrom/'>myStrom Binary Sensor</a>
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