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<h1 class="title indent">
Events
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<p>The core of Home Assistant is the event bus. The event bus allows any component to fire or listen for events. It is the core of everything. For example, any state change will be announced on the event bus as a <code class="highlighter-rouge">state_changed</code> event containing the previous and the new state of an entity.</p>
<p>Home Assistant contains a few built-in events that are used to coordinate between various components.</p>
<h3><a class="title-link" name="event-homeassistant_start" href="#event-homeassistant_start"></a> Event <code class="highlighter-rouge">homeassistant_start</code></h3>
<p>Event <code class="highlighter-rouge">homeassistant_start</code> is fired when all components from the configuration have been intitialized. This is the event that will start the timer firing off <code class="highlighter-rouge">time_changed</code> events.</p>
<h3><a class="title-link" name="event-homeassistant_stop" href="#event-homeassistant_stop"></a> Event <code class="highlighter-rouge">homeassistant_stop</code></h3>
<p>Event <code class="highlighter-rouge">homeassistant_stop</code> is fired when Home Assistant is shutting down. It should be used to close any open connection or release any resources.</p>
<h3><a class="title-link" name="event-state_changed" href="#event-state_changed"></a> Event <code class="highlighter-rouge">state_changed</code></h3>
<p>Event <code class="highlighter-rouge">state_changed</code> is fired when a state changes. Both <code class="highlighter-rouge">old_state</code> and <code class="highlighter-rouge">new_state</code> are state objects. <a href="/topics/state_object/">Documentation about state objects.</a></p>
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<h3><a class="title-link" name="event-time_changed" href="#event-time_changed"></a> Event <code class="highlighter-rouge">time_changed</code></h3>
<p>Event <code class="highlighter-rouge">time_changed</code> is fired every second by the timer and contains the current time.</p>
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<h3><a class="title-link" name="event-service_registered" href="#event-service_registered"></a> Event <code class="highlighter-rouge">service_registered</code></h3>
<p>Event <code class="highlighter-rouge">service_registered</code> is fired when a new service has been registered within Home Assistant.</p>
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<h3><a class="title-link" name="event-call_service" href="#event-call_service"></a> Event <code class="highlighter-rouge">call_service</code></h3>
<p>Event <code class="highlighter-rouge">call_service</code> is fired to call a service.</p>
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<h3><a class="title-link" name="event-service_executed" href="#event-service_executed"></a> Event <code class="highlighter-rouge">service_executed</code></h3>
<p>Event <code class="highlighter-rouge">service_executed</code> is fired by the service handler to indicate the service is done.</p>
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<h3><a class="title-link" name="event-platform_discovered" href="#event-platform_discovered"></a> Event <code class="highlighter-rouge">platform_discovered</code></h3>
<p>Event <code class="highlighter-rouge">platform_discovered</code> is fired when a new platform has been discovered by the discovery component.</p>
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<h3><a class="title-link" name="event-component_loaded" href="#event-component_loaded"></a> Event <code class="highlighter-rouge">component_loaded</code></h3>
<p>Event <code class="highlighter-rouge">component_loaded</code> is fired when a new component has been loaded and initialized.</p>
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