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home-assistant.github.io/components/mqtt.html
Paulus Schoutsen 5a20d28e54 Site updated at 2015-09-01 08:42:54 UTC
2015-09-01 01:42:54 -07:00

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<h1 class="title indent">
MQTT
</h1>
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<p><img src='/images/supported_brands/mqtt.png' class='brand pull-right' />
MQTT (aka MQ Telemetry Transport) is a machine-to-machine or &ldquo;Internet of Things&rdquo; connectivity protocol on top of TCP/IP. It allows extremely lightweight publish/subscribe messaging transport.</p>
<p>The MQTT component needs an MQTT broker like <a href="http://mosquitto.org/">Mosquitto</a> or <a href="http://www.mosca.io/">Mosca</a>. The Eclipse Foundation is running a public MQTT broker at <a href="iot.eclipse.org">iot.eclipse.org</a> or the Mosquitto Project under <a href="http://test.mosquitto.org">test.mosquitto.org</a>. If you prefer to use a public, keep in mind to adjust the topic and that your messages may be publicly accessible.</p>
<p>To integrate MQTT into Home Assistant, add the following section to your <code>configuration.yaml</code> file:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class='yaml'><span class='line'><span class="c1"># Example configuration.yaml entry</span>
</span><span class='line'><span class="l-Scalar-Plain">mqtt</span><span class="p-Indicator">:</span>
</span><span class='line'> <span class="l-Scalar-Plain">broker</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">IP_ADDRESS_BROKER</span>
</span><span class='line'> <span class="c1"># All the other options are optional:</span>
</span><span class='line'> <span class="l-Scalar-Plain">port</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">1883</span>
</span><span class='line'> <span class="l-Scalar-Plain">keepalive</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">60</span>
</span><span class='line'> <span class="l-Scalar-Plain">qos</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">0</span>
</span><span class='line'> <span class="l-Scalar-Plain">username</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">your_username</span>
</span><span class='line'> <span class="l-Scalar-Plain">password</span><span class="p-Indicator">:</span> <span class="l-Scalar-Plain">your_secret_password</span>
</span></code></pre></td></tr></table></div></figure>
<p class='note'>
The MQTT component has no TLS support at the moment. This means that only plain-text communication is possible.
</p>
<h2>Building on top of MQTT</h2>
<ul>
<li><a href="/components/sensor.mqtt.html">MQTT Sensor</a></li>
<li><a href="/components/switch.mqtt.html">MQTT Switch</a></li>
<li><a href="/components/automation.html#mqtt-based-automation">MQTT-automation rule</a>.</li>
<li>Integrating it into a component. See the <a href="https://github.com/balloob/home-assistant/blob/dev/config/custom_components/mqtt_example.py">MQTT example component</a> how to do this.</li>
</ul>
<h2>Testing</h2>
<p>For debugging purposes <code>mosquitto</code> is shipping commandline tools to send and recieve MQTT messages. For sending test messages to a broker running on localhost:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>mosquitto_pub -h 127.0.0.1 -t home-assistant/switch/1/on -m <span class="s2">&quot;Switch is ON&quot;</span>
</span></code></pre></td></tr></table></div></figure>
<p>Another way to send MQTT messages by hand is to use the &ldquo;Developer Tools&rdquo; in the Frontend. Choose &ldquo;Call Service&rdquo; and then <code>mqtt/mqtt_send</code> under &ldquo;Available Services&rdquo;. Enter something similar to the example below into the &ldquo;Service Data&rdquo; field.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class='json'><span class='line'><span class="p">{</span>
</span><span class='line'> <span class="nt">&quot;topic&quot;</span><span class="p">:</span><span class="s2">&quot;home-assistant/switch/1/on&quot;</span><span class="p">,</span>
</span><span class='line'> <span class="nt">&quot;payload&quot;</span><span class="p">:</span><span class="s2">&quot;Switch is ON&quot;</span>
</span><span class='line'><span class="p">}</span>
</span></code></pre></td></tr></table></div></figure>
<p>The message should appear on the bus:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>... <span class="o">[</span>homeassistant<span class="o">]</span> Bus:Handling &lt;Event MQTT_MESSAGE_RECEIVED<span class="o">[</span>L<span class="o">]</span>: <span class="nv">topic</span><span class="o">=</span>home-assistant/switch/1/on, <span class="nv">qos</span><span class="o">=</span>0, <span class="nv">payload</span><span class="o">=</span>Switch is ON&gt;
</span></code></pre></td></tr></table></div></figure>
<p>For reading all messages sent on the topic <code>home-assistant</code> to a broker running on localhost:</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
</pre></td><td class='code'><pre><code class='bash'><span class='line'>mosquitto_sub -h 127.0.0.1 -v -t <span class="s2">&quot;home-assistant/#&quot;</span>
</span></code></pre></td></tr></table></div></figure>
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