372 lines
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372 lines
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<meta name="description" content="Introduction to states in Home Assistant.">
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<h1 class="title indent">
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Using States
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</h1>
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</header>
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<hr class="divider">
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<p>Home Assistant keeps track of the states of entities in a state machine. The state machine has very few requirements:</p>
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<ul>
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<li>Each state is related to an entity identified by an entity id. This id is made up of a domain and an object id. For example <code class="highlighter-rouge">light.kitchen_ceiling</code>. You can make up any combination of domain and object id, even overwriting existing states.</li>
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<li>Each state has a primary attribute that describes the state of the entity. In the case of a light this could be for example “on” and “off”. You can store anything you want in the state, as long as it’s a string (will be converted if it’s not).</li>
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<li>You can store more information about an entity by setting attributes. Attributes is a dictionary that can contain any data that you want. The only requirement is that it’s JSON serializable, so you’re limited to numbers, strings, dictionaries and lists.</li>
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</ul>
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<p><a href="/docs/configuration/state_object/">Description of the state object.</a></p>
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<h3><a class="title-link" name="using-states-in-your-component" href="#using-states-in-your-component"></a> Using states in your component</h3>
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<p>This is a simple tutorial/example on how to create and set states. We will do our work in a component called “hello_state”. The purpose of this component is to display a given text in the frontend.</p>
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<p>To get started, create the file <code class="highlighter-rouge"><config dir>/custom_components/hello_state.py</code> and copy the below example code.</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="s">"""
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Support for showing text in the frontend.
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For more details about this component, please refer to the documentation at
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https://home-assistant.io/cookbook/python_component_basic_state/
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"""</span>
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<span class="kn">import</span> <span class="nn">logging</span>
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<span class="n">_LOGGER</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="n">__name__</span><span class="p">)</span>
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<span class="n">DOMAIN</span> <span class="o">=</span> <span class="s">'hello_state'</span>
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<span class="n">DEPENDENCIES</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="k">def</span> <span class="nf">setup</span><span class="p">(</span><span class="n">hass</span><span class="p">,</span> <span class="n">config</span><span class="p">):</span>
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<span class="s">"""Setup the Hello State component. """</span>
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<span class="n">_LOGGER</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">"The 'hello state' component is ready!"</span><span class="p">)</span>
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<span class="k">return</span> <span class="bp">True</span>
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</code></pre>
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</div>
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<ol>
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<li>In the file header we decided to add some details: A short description and the link to the documentation.</li>
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<li>We want to do some logging. This means that we import the Python logging module and create an alias.</li>
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<li>The component name is equal to the domain name.</li>
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<li>At the moment this component has no dependencies. For detail check <a href="/developers/component_deps_and_reqs/#dependencies">dependencies</a> section.</li>
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<li>
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<p>The <code class="highlighter-rouge">setup</code> function will take care of the initialization of our component.
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The component will only write a log message. Keep in mind for later that you have several options for the severity:</p>
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<ul>
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<li><code class="highlighter-rouge">_LOGGER.info(msg)</code></li>
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<li><code class="highlighter-rouge">_LOGGER.warning(msg)</code></li>
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<li><code class="highlighter-rouge">_LOGGER.error(msg)</code></li>
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<li><code class="highlighter-rouge">_LOGGER.critical(msg)</code></li>
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<li><code class="highlighter-rouge">_LOGGER.exception(msg)</code></li>
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</ul>
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</li>
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<li>We return <code class="highlighter-rouge">True</code> if everything is ok.</li>
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</ol>
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<p>Add the component 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="s">hello_state</span><span class="pi">:</span>
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</code></pre>
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</div>
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<p>After a start or a restart of Home Assistant the component will create an entry in the log.</p>
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<div class="language-bash highlighter-rouge"><pre class="highlight"><code>16-03-12 14:16:42 INFO <span class="o">(</span>MainThread<span class="o">)</span> <span class="o">[</span>custom_components.hello_state] The <span class="s1">'hello state'</span> component is ready!
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</code></pre>
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</div>
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<p>The next step is the introduction of configuration options. A user can pass configuration options to our component via <code class="highlighter-rouge">configuration.yaml</code>. To use them we’ll use the passed in <code class="highlighter-rouge">config</code> variable to our <code class="highlighter-rouge">setup</code> method.</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">logging</span>
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<span class="n">_LOGGER</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="n">__name__</span><span class="p">)</span>
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<span class="n">DOMAIN</span> <span class="o">=</span> <span class="s">'hello_state'</span>
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<span class="n">DEPENDENCIES</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="n">CONF_TEXT</span> <span class="o">=</span> <span class="s">'text'</span>
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<span class="n">DEFAULT_TEXT</span> <span class="o">=</span> <span class="s">'No text!'</span>
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<span class="k">def</span> <span class="nf">setup</span><span class="p">(</span><span class="n">hass</span><span class="p">,</span> <span class="n">config</span><span class="p">):</span>
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<span class="s">"""Set up the Hello State component. """</span>
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<span class="c"># Get the text from the configuration. Use DEFAULT_TEXT if no name is provided.</span>
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<span class="n">text</span> <span class="o">=</span> <span class="n">config</span><span class="p">[</span><span class="n">DOMAIN</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">CONF_TEXT</span><span class="p">,</span> <span class="n">DEFAULT_TEXT</span><span class="p">)</span>
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<span class="c"># States are in the format DOMAIN.OBJECT_ID</span>
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<span class="n">hass</span><span class="o">.</span><span class="n">states</span><span class="o">.</span><span class="nb">set</span><span class="p">(</span><span class="s">'hello_state.Hello_State'</span><span class="p">,</span> <span class="n">text</span><span class="p">)</span>
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<span class="k">return</span> <span class="bp">True</span>
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</code></pre>
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</div>
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<p>To use the latest feature of our component, update the entry in 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="s">hello_state</span><span class="pi">:</span>
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<span class="s">text</span><span class="pi">:</span> <span class="s1">'</span><span class="s">Hello,</span><span class="nv"> </span><span class="s">World!'</span>
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</code></pre>
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</div>
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<p>Thanks to <code class="highlighter-rouge">DEFAULT_TEXT</code> variable the component will launch even if no <code class="highlighter-rouge">text:</code> field is used in the <code class="highlighter-rouge">configuration.yaml</code> file. Quite often there are variables which are required. It’s important to check if all mandatory configuration variables are provided. If not, the setup should fail. We will use <code class="highlighter-rouge">voluptuous</code> as a helper to achieve this. The next listing shows the essential parts.</p>
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<div class="language-python highlighter-rouge"><pre class="highlight"><code><span class="kn">import</span> <span class="nn">voluptuous</span> <span class="kn">as</span> <span class="nn">vol</span>
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<span class="kn">import</span> <span class="nn">homeassistant.helpers.config_validation</span> <span class="kn">as</span> <span class="nn">cv</span>
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<span class="n">CONFIG_SCHEMA</span> <span class="o">=</span> <span class="n">vol</span><span class="o">.</span><span class="n">Schema</span><span class="p">({</span>
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<span class="n">DOMAIN</span><span class="p">:</span> <span class="n">vol</span><span class="o">.</span><span class="n">Schema</span><span class="p">({</span>
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<span class="n">vol</span><span class="o">.</span><span class="n">Required</span><span class="p">(</span><span class="n">CONF_TEXT</span><span class="p">):</span> <span class="n">cv</span><span class="o">.</span><span class="n">string</span><span class="p">,</span>
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<span class="p">})</span>
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<span class="p">},</span> <span class="n">extra</span><span class="o">=</span><span class="n">vol</span><span class="o">.</span><span class="n">ALLOW_EXTRA</span><span class="p">)</span>
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</code></pre>
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</div>
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<p>Now, when <code class="highlighter-rouge">text:</code> is missing from the config, Home Assistant will alert the user and not setup your component.</p>
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<p>After a start or a restart of Home Assistant the component will be visible in the frontend if the <code class="highlighter-rouge">configuration.yaml</code> file is up-to-date.</p>
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<p class="img">
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<img src="/images/screenshots/create-component01.png" />
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</p>
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<p>In order to expose attributes of your component, you will need to define a method called <code class="highlighter-rouge">state_attributes</code> which will return a dictionary of attributes:</p>
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<div class="highlighter-rouge"><pre class="highlight"><code><span class="k">@property</span>
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<span class="n">def</span> <span class="n">state_attributes</span><span class="p">(</span><span class="n">self</span><span class="p">)</span><span class="o">:</span>
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<span class="s">"""Return the attributes of the entity."""</span>
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<span class="k">return</span> <span class="n">self</span><span class="p">.</span><span class="n">_attributes</span>
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</code></pre>
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</div>
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<p>To get your component included in the Home Assistant releases, follow the steps described in the <a href="https://home-assistant.io/developers/#submitting-improvements">Submitting improvements</a> section. Basically you only need to move your component in the <code class="highlighter-rouge">homeassistant/component/</code> directory of your fork and create a Pull Request.</p>
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</article>
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</div>
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<aside id="sidebar" class="grid__item one-third lap-one-whole palm-one-whole">
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<div class="grid">
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<section class="aside-module grid__item one-whole lap-one-half">
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.github.io/tree/current/source/developers/development_states.markdown'>Edit this page on GitHub</a></div>
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<div class='section'>
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<h1 class="title delta">Development Guide</h1>
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<ul class='divided sidebar-menu'>
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<li>
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<a href='/developers/'>Introduction </a>
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<ul>
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<li><a href='/developers/architecture/'>Architecture </a></li>
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<li><a href='/developers/architecture_components/'>Components </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/development/'>Starting with Development </a>
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<ul>
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<li><a href='/developers/development_environment/'>Setting up Environment </a></li>
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<li><a href='/developers/development_submitting/'>Submit your Work </a></li>
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<li><a href='/developers/development_checklist/'>Checklist </a></li>
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<li><a href='/developers/development_guidelines/'>Style guidelines </a></li>
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<li><a href='/developers/development_testing/'>Testing </a></li>
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<li><a href='/developers/development_catching_up/'>Catching up with Reality </a></li>
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<li><a href='/developers/development_validation/'>Validation </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/development_101/'>Development 101 </a>
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<ul>
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<li><a href='/developers/development_hass_object/'>Hass object </a></li>
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<li><a href='/developers/development_events/'>Events </a></li>
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<li><a class='active' href='/developers/development_states/'>States </a></li>
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<li><a href='/developers/development_services/'>Services </a></li>
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<li><a href='/developers/development_config/'>Config </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/add_new_platform/'>Creating a new platform (to support a new device) </a>
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<ul>
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<li><a href='/developers/code_review_platform/'>Checklist creating a platform </a></li>
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<li><a href='/developers/platform_example_sensor/'>Example sensor platform </a></li>
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<li><a href='/developers/platform_example_light/'>Example light platform </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/creating_components/'>Adding a new component </a>
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<ul>
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<li><a href='/developers/code_review_component/'>Checklist creating a component </a></li>
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<li><a href='/developers/component_loading/'>Loading components </a></li>
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||
<li><a href='/developers/component_deps_and_reqs/'>Requirements & Dependencies </a></li>
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||
<li><a href='/developers/component_events/'>Handling events </a></li>
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||
<li><a href='/developers/component_states/'>States </a></li>
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||
<li><a href='/developers/component_visibility/'>Visibility </a></li>
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||
<li><a href='/developers/component_generic_discovery/'>Loading Platforms </a></li>
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<li><a href='/developers/component_discovery/'>Component Discovery </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/intent/'>Intents (handling voice responses) </a>
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<ul>
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<li><a href='/developers/intent/firing/'>Firing intents </a></li>
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<li><a href='/developers/intent/handling/'>Handling intents </a></li>
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||
<li><a href='/developers/intent/conversation/'>Registering sentences </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/asyncio/'>Asynchronous Programming </a>
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<ul>
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<li><a href='/developers/asyncio_101/'>Introduction to asyncio </a></li>
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||
<li><a href='/developers/asyncio_categorizing_functions/'>Categorizing Functions </a></li>
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<li><a href='/developers/asyncio_working_with_async/'>Working with Async </a></li>
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||
<li><a href='/developers/asyncio_misc/'>Miscellaneous </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/frontend/'>Frontend Development </a>
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<ul>
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<li><a href='/developers/frontend_add_card/'>Add State Card </a></li>
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<li><a href='/developers/frontend_add_more_info/'>Add More Info Dialog </a></li>
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||
<li><a href='/developers/frontend_creating_custom_panels/'>Add Custom Panels </a></li>
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<li><a href='/developers/frontend_creating_custom_ui/'>Add Custom UI </a></li>
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||
</ul>
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||
</li>
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||
<li>
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||
<a href='/developers/hassio/architecture/'>Hass.io architecture </a>
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||
<ul>
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||
<li><a href='/developers/hassio/debugging/'>Debugging Hass.io </a></li>
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||
</ul>
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</li>
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<li>
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<a href='/developers/hassio/addon_development/'>Hass.io Add-on Development </a>
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||
<ul>
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<li><a href='/developers/hassio/addon_tutorial/'>Tutorial: Making your first add-on </a></li>
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||
<li><a href='/developers/hassio/addon_config/'>Configuration </a></li>
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||
<li><a href='/developers/hassio/addon_communication/'>Communication </a></li>
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||
<li><a href='/developers/hassio/addon_testing/'>Local Testing </a></li>
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||
<li><a href='/developers/hassio/addon_publishing/'>Publishing </a></li>
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||
<li><a href='/developers/hassio/addon_repository/'>Repositories </a></li>
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||
</ul>
|
||
</li>
|
||
<li>
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<a href='/developers/api/'>API </a>
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<ul>
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<li><a href='https://dev-docs.home-assistant.io/en/dev/'>Python API </a></li>
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||
<li><a href='/developers/websocket_api/'>Websocket API </a></li>
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<li><a href='/developers/rest_api/'>REST API </a></li>
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||
<li><a href='/developers/python_api/'>Python REST API </a></li>
|
||
<li><a href='/developers/server_sent_events/'>Server-sent events </a></li>
|
||
</ul>
|
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</li>
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||
<li>
|
||
<a href='/developers/documentation/'>Website/Documentation </a>
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||
<ul>
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||
<li><a href='/developers/documentation/standards/'>Standards </a></li>
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||
<li><a href='/developers/documentation/create_page/'>Create a new page </a></li>
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||
</ul>
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</li>
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<li><a href='/developers/helpers/'>Online helpers </a></li>
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<li><a href='/developers/releasing/'>Releasing </a></li>
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<li><a href='/developers/maintenance/'>Maintenance </a></li>
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<li>
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Governance
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<ul>
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<li><a href='/developers/cla/'>Contributor License Agreement </a></li>
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<li><a href='/code_of_conduct/'>Code of Conduct </a></li>
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<li><a href='/developers/credits/'>Credits </a></li>
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<li><a href='/developers/license/'>License </a></li>
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</li>
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</section>
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<footer>
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<div class="copyright">
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<a rel="me" href='https://twitter.com/home_assistant'><i class="icon-twitter"></i></a>
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<div class="credit">
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Contact us at <a href='mailto:hello@home-assistant.io'>hello@home-assistant.io</a> (no support!).<br>
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