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<title>Example light platform - Home Assistant</title>
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<meta name="author" content="Paulus Schoutsen">
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<meta name="description" content="Minimum implementation of a Home Assistant platform.">
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<h1 class="title indent">
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Example Light Platform
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</h1>
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<hr class="divider">
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<p>This example is for adding support for the imaginary Awesome Lights. It shows the different best practices for developing a platform.</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">logging</span>
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<span class="comment"># Import the device class from the component that you want to support</span>
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<span class="keyword">from</span> <span class="include">homeassistant.components.light</span> <span class="keyword">import</span> <span class="include">ATTR_BRIGHTNESS</span>, <span class="include">Light</span>
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<span class="keyword">from</span> <span class="include">homeassistant.const</span> <span class="keyword">import</span> <span class="include">CONF_HOST</span>, <span class="include">CONF_USERNAME</span>, <span class="include">CONF_PASSWORD</span>
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<span class="comment"># Home Assistant depends on 3rd party packages for API specific code.</span>
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REQUIREMENTS = [<span class="string"><span class="delimiter">'</span><span class="content">awesome_lights==1.2.3</span><span class="delimiter">'</span></span>]
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_LOGGER = logging.getLogger(__name__)
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<span class="keyword">def</span> <span class="function">setup_platform</span>(hass, config, add_devices, discovery_info=<span class="predefined-constant">None</span>):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Initialize Awesome Light platform.</span><span class="delimiter">"""</span></span>
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<span class="keyword">import</span> <span class="include">awesomelights</span>
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<span class="comment"># Validate passed in config</span>
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host = config.get(CONF_HOST)
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username = config.get(CONF_USERNAME)
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password = config.get(CONF_PASSWORD)
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<span class="keyword">if</span> host <span class="keyword">is</span> <span class="predefined-constant">None</span> <span class="keyword">or</span> username <span class="keyword">is</span> <span class="predefined-constant">None</span> <span class="keyword">or</span> password <span class="keyword">is</span> <span class="predefined-constant">None</span>:
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_LOGGER.error(<span class="string"><span class="delimiter">'</span><span class="content">Invalid config. Expected %s, %s and %s</span><span class="delimiter">'</span></span>,
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CONF_HOST, CONF_USERNAME, CONF_PASSWORD)
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<span class="keyword">return</span> <span class="predefined-constant">False</span>
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<span class="comment"># Setup connection with devices/cloud</span>
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hub = awesomelights.Hub(host, username, password)
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<span class="comment"># Verify that passed in config works</span>
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<span class="keyword">if</span> <span class="keyword">not</span> hub.is_valid_login():
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_LOGGER.error(<span class="string"><span class="delimiter">'</span><span class="content">Could not connect to AwesomeLight hub</span><span class="delimiter">'</span></span>)
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<span class="keyword">return</span> <span class="predefined-constant">False</span>
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<span class="comment"># Add devices</span>
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add_devices(AwesomeLight(light) <span class="keyword">for</span> light <span class="keyword">in</span> hub.lights())
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<span class="keyword">class</span> <span class="class">AwesomeLight</span>(Light):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Represents an AwesomeLight in Home Assistant.</span><span class="delimiter">"""</span></span>
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<span class="keyword">def</span> <span class="function">__init__</span>(<span class="predefined-constant">self</span>, light):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Initialize an AwesomeLight.</span><span class="delimiter">"""</span></span>
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<span class="predefined-constant">self</span>._light = light
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<span class="decorator">@property</span>
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<span class="keyword">def</span> <span class="function">name</span>(<span class="predefined-constant">self</span>):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Return the display name of this light</span><span class="delimiter">"""</span></span>
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<span class="keyword">return</span> <span class="predefined-constant">self</span>._light.name
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<span class="decorator">@property</span>
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<span class="keyword">def</span> <span class="function">brightness</span>(<span class="predefined-constant">self</span>):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Brightness of the light (an integer in the range 1-255).</span><span class="content">
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</span><span class="content">
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</span><span class="content"> This method is optional. Removing it indicates to Home Assistant</span><span class="content">
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</span><span class="content"> that brightness is not supported for this light.</span><span class="content">
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</span><span class="content"> </span><span class="delimiter">"""</span></span>
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<span class="keyword">return</span> <span class="predefined-constant">self</span>._light.brightness
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<span class="decorator">@property</span>
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<span class="keyword">def</span> <span class="function">is_on</span>(<span class="predefined-constant">self</span>):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">If light is on.</span><span class="delimiter">"""</span></span>
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<span class="keyword">return</span> <span class="predefined-constant">self</span>._light.is_on()
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<span class="keyword">def</span> <span class="function">turn_on</span>(<span class="predefined-constant">self</span>, **kwargs):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Instruct the light to turn on.</span><span class="content">
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</span><span class="content">
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</span><span class="content"> You can skip the brightness part if your light does not support</span><span class="content">
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</span><span class="content"> brightness control.</span><span class="content">
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</span><span class="content"> </span><span class="delimiter">"""</span></span>
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<span class="predefined-constant">self</span>._light.brightness = kwargs.get(ATTR_BRIGHTNESS, <span class="integer">255</span>)
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<span class="predefined-constant">self</span>._light.turn_on()
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<span class="keyword">def</span> <span class="function">turn_off</span>(<span class="predefined-constant">self</span>, **kwargs):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Instruct the light to turn off.</span><span class="delimiter">"""</span></span>
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<span class="predefined-constant">self</span>._light.turn_off()
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<span class="keyword">def</span> <span class="function">update</span>(<span class="predefined-constant">self</span>):
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<span class="docstring"><span class="delimiter">"""</span><span class="content">Fetch new state data for this light.</span><span class="content">
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</span><span class="content">
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</span><span class="content"> This is the only method that should fetch new data for Home Assitant.</span><span class="content">
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</span><span class="content"> </span><span class="delimiter">"""</span></span>
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<span class="predefined-constant">self</span>._light.update()
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</pre></div>
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.io/tree/master/source/developers/platform_example_light.markdown'>Edit this page on GitHub</a></div>
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<h1 class="title delta">Development Guide</h1>
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<a href='/developers/add_new_platform/'>Support a new device (as a platform) </a>
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<li><a href='/developers/platform_example_sensor/'>Example sensor platform </a></li>
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<li><a class='active' href='/developers/platform_example_light/'>Example light platform </a></li>
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