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feat: data-sourced attributes start with uncertain quality before first DCL value

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Attributes bound to data connections now initialize with "Uncertain" quality,
distinguishing "never received a value" from "known good" or "connection lost."
Quality is tracked per attribute and included in GetAttributeResponse.
This commit is contained in:
Joseph Doherty
2026-03-17 18:25:39 -04:00
parent adc1af9f16
commit 775cb8084f
6 changed files with 76 additions and 6 deletions
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7
Component-SiteRuntime.md
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@@ -87,9 +87,10 @@ Deployment Manager Singleton (Cluster Singleton)
### Initialization
1. Load all attribute values from the flattened configuration (static defaults).
2. Register data source references with the Data Connection Layer for subscriptions.
3. Create child Script Actors (one per script defined on the instance).
4. Create child Alarm Actors (one per alarm defined on the instance).
2. Set quality to **uncertain** for all attributes that have a data source reference. Static attributes (no data source reference) have quality **good**. The uncertain quality persists until the first value update arrives from the Data Connection Layer, distinguishing "not yet received" from "known good" or "connection lost."
3. Register data source references with the Data Connection Layer for subscriptions.
4. Create child Script Actors (one per script defined on the instance).
5. Create child Alarm Actors (one per alarm defined on the instance).
### Attribute Value Updates
- Receives tag value updates from the Data Connection Layer for attributes with data source references.