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<meta name="description" content="Instructions how to setup MQTT Statestream within Home Assistant.">
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MQTT Statestream
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<p>The <code class="highlighter-rouge">mqtt_statestream</code> component publishes state changes in Home Assistant to individual MQTT topics.</p>
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<p>To enable MQTT Statestream in Home Assistant, add the following section to your <code class="highlighter-rouge">configuration.yaml</code> file:</p>
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<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yaml entry</span>
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<span class="s">mqtt_statestream</span><span class="pi">:</span>
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<span class="s">base_topic</span><span class="pi">:</span> <span class="s">homeassistant</span>
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<span class="s">publish_attributes</span><span class="pi">:</span> <span class="s">true</span>
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<span class="s">publish_timestamps</span><span class="pi">:</span> <span class="s">true</span>
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</code></pre>
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<p>Configuration variables:</p>
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<ul>
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<li><strong>base_topic</strong> (<em>Required</em>): Base topic used to generate the actual topic used to publish.</li>
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<li><strong>publish_attributes</strong> (<em>Optional</em>): Publish attributes of the entity as well as the state.
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Default is false.</li>
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<li><strong>publish_timestamps</strong> (<em>Optional</em>): Publish the last_changed and last_updated timestamps for the entity.
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Default is false.</li>
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</ul>
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<h2>Operation</h2>
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<p>When any Home Assistant entity changes, this component will publish that change to MQTT.</p>
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<p>The topic for each entity is different, so you can easily subscribe other systems to just the entities you are interested in.
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The topic will be in the form <code class="highlighter-rouge">base_topic/domain/entity/state</code>.</p>
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<p>For example, with the example configuration above, if an entity called ‘light.master_bedroom_dimmer’ is turned on, this component will publish <code class="highlighter-rouge">on</code> to <code class="highlighter-rouge">homeassistant/light/master_bedroom_dimmer/state</code>.</p>
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<p>If that entity also has an attribute called <code class="highlighter-rouge">brightness</code>, the component will also publish the value of that attribute to <code class="highlighter-rouge">homeassistant/light/master_bedroom_dimmer/brightness</code>.</p>
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<p>All states and attributes are passed through JSON serialization before publishing. <strong>Please note</strong> that this causes strings to be quoted (e.g., the string ‘on’ will be published as ‘“on”’). You can access the JSON deserialized values (as well as unquoted strings) at many places by using <code class="highlighter-rouge">value_json</code> instead of <code class="highlighter-rouge">value</code>.</p>
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<p>The last_updated and last_changed values for the entity will be published to <code class="highlighter-rouge">homeassistant/light/master_bedroom_dimmer/last_updated</code> and <code class="highlighter-rouge">homeassistant/light/master_bedroom_dimmer/last_changed</code>, respectively. The timestamps are in ISO 8601 format - for example, <code class="highlighter-rouge">2017-10-01T23:20:30.920969+00:00</code>.</p>
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