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MQTT Light
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<p>The <code class="highlighter-rouge">mqtt</code> light platform lets you control your MQTT enabled light. It supports setting brightness, color temperature, effects, flashing, on/off, RGB colors, transitions, XY colors and white values.</p>
<p>In an ideal scenario, the MQTT device will have a state topic to publish state changes. If these messages are published with RETAIN flag, the MQTT switch will receive an instant state update after subscription and will start with correct state. Otherwise, the initial state of the switch will be false/off.</p>
<p>When a state topic is not available, the light will work in optimistic mode. In this mode, the light will immediately change state after every command. Otherwise, the light will wait for state confirmation from device (message from <code class="highlighter-rouge">state_topic</code>).</p>
<p>Optimistic mode can be forced, even if state topic is available. Try to enable it, if experiencing incorrect light operation.</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yml entry</span>
<span class="s">light</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">command_topic</span><span class="pi">:</span> <span class="s2">"</span><span class="s">office/rgb1/light/switch"</span>
</code></pre>
</div>
<p>Configuration variables:</p>
<ul>
<li><strong>command_topic</strong> (<em>Required</em>): The MQTT topic to publish commands to change the switch state.</li>
<li><strong>brightness_command_topic</strong> (<em>Optional</em>): The MQTT topic to publish commands to change the lights brightness.</li>
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<li><strong>xy_state_topic</strong> (<em>Optional</em>): The MQTT topic subscribed to receive XY state updates.</li>
<li><strong>xy_value_template</strong> (<em>Optional</em>): Defines a <a href="/topics/templating/">template</a> to extract the XY value.</li>
</ul>
<p class="note warning">
Make sure that your topics match exact. <code class="highlighter-rouge">some-topic/</code> and <code class="highlighter-rouge">some-topic</code> are different topics.
</p>
<p class="note warning">
XY and RGB can not be used at the same time. If both are provided, XY overrides RGB.
</p>
<h2><a class="title-link" name="comparison-of-light-mqtt-platforms" href="#comparison-of-light-mqtt-platforms"></a> Comparison of light MQTT platforms</h2>
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<h2><a class="title-link" name="examples" href="#examples"></a> Examples</h2>
<p>In this section you find some real life examples of how to use this sensor.</p>
<h3><a class="title-link" name="brightness-and-rgb-support" href="#brightness-and-rgb-support"></a> Brightness and RGB support</h3>
<p>To enable a light with brightness and RGB support 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.yml entry</span>
<span class="s">light</span><span class="pi">:</span>
<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">optimistic</span><span class="pi">:</span> <span class="s">false</span>
</code></pre>
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<h3><a class="title-link" name="brightness-and-no-rgb-support" href="#brightness-and-no-rgb-support"></a> Brightness and no RGB support</h3>
<p>To enable a light with brightness (no RGB version) 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.yml entry</span>
<span class="s">light</span><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">optimistic</span><span class="pi">:</span> <span class="s">false</span>
</code></pre>
</div>
<h3><a class="title-link" name="implementations" href="#implementations"></a> Implementations</h3>
<p>A basic example using a nodeMCU board (ESP8266) to control its built-in led (on/off) can be found <a href="https://github.com/mertenats/open-home-automation/tree/master/ha_mqtt_light">here</a>. <a href="https://github.com/mertenats/open-home-automation/tree/master/ha_mqtt_rgb_light">Here</a> is another example to control a RGB led (on/off, brightness and colors).</p>
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