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Document zwave_js_value_updated event (#17615)

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* Document zwave_js_value_updated event

* add statement about assumed_state

* use table and add entity domain impacted

* add example automation

* lint
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Raman Gupta 2021-04-28 23:23:07 -04:00 committed by Franck Nijhof
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@ -312,6 +312,50 @@ Value Notification example:
}
```
### Value updated events
Due to some devices not following the Z-Wave spec, there are scenarios where a device will send a value update but a state change won't be detected in Home Assistant. To address the gap, the `zwave_js_value_updated` event can be listened to to capture any value updates that are received by an affected entity. This event is **enabled on a per device and per entity domain basis**, and the entities will have `assumed_state` set to `true`. This change will affect how the UI for these entities look; if you'd like the UI to match other entities of the same type where `assumed_state` is not set to `true`, you can override the setting via [entity customization](/docs/configuration/customizing-devices/#assumed_state).
The following devices currently support this event:
| Make | Model | Entity Domain |
|----------------- |---------------------------------- |--------------- |
| Vision Security | ZL7432 In Wall Dual Relay Switch | `switch` |
Value Updated example:
```json
{
"node_id": 4,
"home_id": "974823419",
"device_id": "ad8098fe80980974",
"entity_id": "switch.in_wall_dual_relay_switch",
"command_class": 37,
"command_class_name": "Switch Binary",
"endpoint": 0,
"property": "currentValue",
"property_name": "currentValue",
"property_key": null,
"property_key_name": null,
"value": 0,
"value_raw": 0
}
```
This event can be used to trigger a refresh of values when the new state needs to be retrieved. Here's an example automation:
```yaml
trigger:
platform: event
event_type: zwave_js_value_updated
event_data:
entity_id: switch.in_wall_dual_relay_switch
action:
- service: zwave_js.refresh_value
target:
entity_id: switch.in_wall_dual_relay_switch_2, switch.in_wall_dual_relay_switch_3
```
## Current Limitations
As this integration is still in the early stages there are some important limitations to be aware of.