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<title>Basic MQTT Example - Home Assistant</title>
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<h1 class="title indent">
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Basic MQTT Example
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</h1>
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</header>
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<hr class="divider">
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<p class="note">
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This example requires you to have the <a href="/components/mqtt/">MQTT component</a> up and running.
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</p>
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<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><config dir>/custom_components/hello_mqtt.py</code> and copy the below example code.</p>
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<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>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="keyword">import</span> <span class="include">homeassistant.loader</span> <span class="keyword">as</span> loader
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<span class="comment"># The domain of your component. Should be equal to the name of your component.</span>
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DOMAIN = <span class="string"><span class="delimiter">"</span><span class="content">hello_mqtt</span><span class="delimiter">"</span></span>
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<span class="comment"># List of component names (string) your component depends upon.</span>
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DEPENDENCIES = [<span class="string"><span class="delimiter">'</span><span class="content">mqtt</span><span class="delimiter">'</span></span>]
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CONF_TOPIC = <span class="string"><span class="delimiter">'</span><span class="content">topic</span><span class="delimiter">'</span></span>
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DEFAULT_TOPIC = <span class="string"><span class="delimiter">'</span><span class="content">home-assistant/hello_mqtt</span><span class="delimiter">'</span></span>
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<span class="keyword">def</span> <span class="function">setup</span>(hass, config):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Setup the Hello MQTT component.</span><span class="delimiter">"""</span></span>
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mqtt = loader.get_component(<span class="string"><span class="delimiter">'</span><span class="content">mqtt</span><span class="delimiter">'</span></span>)
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topic = config[DOMAIN].get(<span class="string"><span class="delimiter">'</span><span class="content">topic</span><span class="delimiter">'</span></span>, DEFAULT_TOPIC)
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entity_id = <span class="string"><span class="delimiter">'</span><span class="content">hello_mqtt.last_message</span><span class="delimiter">'</span></span>
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<span class="comment"># Listener to be called when we receive a message.</span>
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<span class="keyword">def</span> <span class="function">message_received</span>(topic, payload, qos):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">A new MQTT message has been received.</span><span class="delimiter">"""</span></span>
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hass.states.set(entity_id, payload)
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<span class="comment"># Subscribe our listener to a topic.</span>
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mqtt.subscribe(hass, topic, message_received)
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<span class="comment"># Set the intial state</span>
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hass.states.set(entity_id, <span class="string"><span class="delimiter">'</span><span class="content">No messages</span><span class="delimiter">'</span></span>)
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<span class="comment"># Service to publish a message on MQTT.</span>
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<span class="keyword">def</span> <span class="function">set_state_service</span>(call):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Service to send a message.</span><span class="delimiter">"""</span></span>
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mqtt.publish(hass, topic, call.data.get(<span class="string"><span class="delimiter">'</span><span class="content">new_state</span><span class="delimiter">'</span></span>))
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<span class="comment"># Register our service with Home Assistant.</span>
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hass.services.register(DOMAIN, <span class="string"><span class="delimiter">'</span><span class="content">set_state</span><span class="delimiter">'</span></span>, set_state_service)
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<span class="comment"># Return boolean to indicate that initialization was successfully.</span>
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<span class="keyword">return</span> <span class="predefined-constant">True</span>
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</pre></div>
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</div>
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</div>
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<p>Load the component by adding the following to your <code>configuration.yaml</code>. When your component is loaded, a new entity should popup and there should be a new service available to call.</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="comment"># configuration.yaml entry</span>
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<span class="key">hello_mqtt</span>:
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<span class="key">topic</span>: <span class="string"><span class="content">some_mqtt/topic/here</span></span>
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</pre></div>
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</div>
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</div>
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<p>You can call the service with example payload:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre>{
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<span class="key"><span class="delimiter">"</span><span class="content">new_state</span><span class="delimiter">"</span></span>: <span class="string"><span class="delimiter">"</span><span class="content">some new state</span><span class="delimiter">"</span></span>
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}
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</pre></div>
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<div class='section'>
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<a href='/cookbook'>Back to the cookbook</a>
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</div>
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<div class='section'>
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<h1 class="title delta">Custom Python Component Examples</h1>
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<ul class='divided'>
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<li>
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Basic MQTT Example
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</li>
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<li>
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<a href='/cookbook/python_component_basic_service/'>Basic Service Example</a>
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</li>
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<li>
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<a href='/cookbook/python_component_basic_state/'>Basic State Setting Example</a>
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