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Basic MQTT Example
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<p class="note">
This example requires you to have the <a href="/components/mqtt/">MQTT component</a> up and running.
</p>
<p>This is a simple hello world example to show the basics of using MQTT in a custom component. To use this example, create the file <code class="highlighter-rouge">&lt;config dir&gt;/custom_components/hello_mqtt.py</code> and copy the below example code.</p>
<p>This example follows a topic on MQTT and updates the state of an entity to the last message received on that topic. It will also register a service ‘set_state’ that will publish a message to the MQTT topic that we’re listening to.</p>
<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">homeassistant.loader</span> <span class="kn">as</span> <span class="nn">loader</span>
<span class="c"># The domain of your component. Should be equal to the name of your component.</span>
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<span class="k">return</span> <span class="bp">True</span>
</code></pre>
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<p>Load the component by adding the following to your <code class="highlighter-rouge">configuration.yaml</code>. When your component is loaded, a new entity should popup and there should be a new service available to call.</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># configuration.yaml entry</span>
<span class="s">hello_mqtt</span><span class="pi">:</span>
<span class="s">topic</span><span class="pi">:</span> <span class="s">some_mqtt/topic/here</span>
</code></pre>
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<p>You can call the service with example payload:</p>
<div class="language-json highlighter-rouge"><pre class="highlight"><code><span class="p">{</span><span class="w">
</span><span class="nt">"new_state"</span><span class="p">:</span><span class="w"> </span><span class="s2">"some new state"</span><span class="w">
</span><span class="p">}</span><span class="w">
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