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* move configuration redirects from source files in source\_docs\configuration into the dedicated source\_redirects file * ✏️ Tweak * ✏️ Tweak Co-authored-by: Klaas Schoute <klaas_schoute@hotmail.com>
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| title | description |
|---|---|
| Events | Describes all there is to know about events in Home Assistant. |
The core of Home Assistant is the event bus. The event bus allows any integration 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 state_changed event containing the previous and the new state of an entity.
Home Assistant contains a few built-in events that are used to coordinate between various integrations.
Event state_changed
Event state_changed is fired when a state changes. Both old_state and new_state are state objects. Documentation about state objects.
| Field | Description |
|---|---|
entity_id |
Entity ID of the changed entity. Example: light.kitchen |
old_state |
The previous state of the entity before it changed. This field is omitted if the entity is new. |
new_state |
The new state of the entity. This field is omitted if the entity is removed from the state machine. |
Event time_changed
Event time_changed is fired every second by the timer and contains the current time.
| Field | Description |
|---|---|
now |
A datetime object containing the current time in UTC. |
Event service_registered
Event service_registered is fired when a new service has been registered within Home Assistant.
| Field | Description |
|---|---|
domain |
Domain of the service. Example: light. |
service |
The service to call. Example: turn_on |
Event call_service
Event call_service is fired to call a service.
| Field | Description |
|---|---|
domain |
Domain of the service. Example: light. |
service |
The service to call. Example: turn_on |
service_data |
Dictionary with the service call parameters. Example: { 'brightness': 120 }. |
service_call_id |
String with a unique call id. Example: 23123-4. |
Event service_executed
Event service_executed is fired by the service handler to indicate the service is done.
| Field | Description |
|---|---|
service_call_id |
String with the unique call id of the service call that was executed. Example: 23123-4. |
Event automation_reloaded
Event automation_reloaded is fired when automations have been reloaded and thus might have changed.
This event has no additional data.
Event scene_reloaded
Event scene_reloaded is fired when scenes have been reloaded and thus might have changed.
This event has no additional data.
Event platform_discovered
Event platform_discovered is fired when a new platform has been discovered by the discovery component.
| Field | Description |
|---|---|
service |
The platform that is discovered. Example: zwave. |
discovered |
Dictionary containing discovery information. Example: { "host": "192.168.1.10", "port": 8889}. |
Event component_loaded
Event component_loaded is fired when a new integration has been loaded and initialized.
| Field | Description |
|---|---|
component |
Domain of the integration that has just been initialized. Example: light. |