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Document Subscribe to trigger websocket (#1182)

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Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>
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@ -192,9 +192,94 @@ For each event that matches, the server will send a message of type `event`. The
}
```
## Subscribe to trigger
You can also subscribe to one or more triggers with `subscribe_trigger`. These are the same triggers syntax as used for [automation triggers](https://www.home-assistant.io/docs/automation/trigger/). You can define one or a list of triggers.
```json
{
"id": 2,
"type": "subscribe_trigger",
"trigger": {
"platform": "state",
"entity_id": "binary_sensor.motion_occupancy",
"from": "off",
"to":"on"
},
}
```
As a response you get:
```json
{
"id": 2,
"type": "result",
"success": true,
"result": null
}
```
For each trigger that matches, the server will send a message of type `trigger`. The `id` in the message will point at the original `id` of the `subscribe_trigger` command. Note that your variables will be different based on the used trigger.
```json
{
"id": 2,
"type": "event",
"event": {
"variables": {
"trigger": {
"id": "0",
"idx": "0",
"platform": "state",
"entity_id": "binary_sensor.motion_occupancy",
"from_state": {
"entity_id": "binary_sensor.motion_occupancy",
"state": "off",
"attributes": {
"device_class": "motion",
"friendly_name": "motion occupancy"
},
"last_changed": "2022-01-09T10:30:37.585143+00:00",
"last_updated": "2022-01-09T10:33:04.388104+00:00",
"context": {
"id": "90e30ad8e6d0c218840478d3c21dd754",
"parent_id": null,
"user_id": null
}
},
"to_state": {
"entity_id": "binary_sensor.motion_occupancy",
"state": "on",
"attributes": {
"device_class": "motion",
"friendly_name": "motion occupancy"
},
"last_changed": "2022-01-09T10:33:04.391956+00:00",
"last_updated": "2022-01-09T10:33:04.391956+00:00",
"context": {
"id": "9b263f9e4e899819a0515a97f6ddfb47",
"parent_id": null,
"user_id": null
}
},
"for": null,
"attribute": null,
"description": "state of binary_sensor.motion_occupancy"
}
},
"context": {
"id": "9b263f9e4e899819a0515a97f6ddfb47",
"parent_id": null,
"user_id": null
}
}
}
```
### Unsubscribing from events
You can unsubscribe from previously created subscription events. Pass the id of the original subscription command as value to the subscription field.
You can unsubscribe from previously created subscriptions. Pass the id of the original subscription command as value to the subscription field.
```json
{