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Merge b640-619alm: OpcUaClient native alarms route to RawPath conditions + ConditionRefresh; docker-dev opc-plc seed (#619)

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Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
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Joseph Doherty
2026-10-08 17:26:47 -04:00
parent 5af9aae2d4 8f5b265db8
commit 3bf874ae44
5 changed files with 870 additions and 19 deletions
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docs/drivers/OpcUaClient.md
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@@ -91,6 +91,24 @@ rather than surfacing as a runtime surprise.
| `IAlarmSource` | `SubscribeAlarmsAsync` (EventFilter) + `AcknowledgeAsync` | Subscribes to upstream alarm/condition events and forwards acks |
| `IHistoryProvider` | `ReadRawAsync` / `ReadProcessedAsync` / `ReadAtTimeAsync` → `Session.HistoryReadAsync` | **Unique to this driver** — passthrough history read against the upstream server |
> **Native alarms (#619).** An alarm raw tag is `TagConfig` `{ "nodeId": "<upstream SourceNode>", "alarm": {...} }`.
> The host subscribes with RawPaths and routes on (driver, RawPath), so the driver matches each
> event's `ConditionId` (then its `SourceNode`) against the tag's authored `nodeId` and reports the **RawPath** as
> `ConditionId`. Author `nodeId` as the upstream **condition** node for a 1:1 mapping (required when one source carries
> several conditions, e.g. Hi + HiHi); authoring the **source** node folds every condition of that source into one
> tag. `Acknowledge` is called on the condition node of the last event seen for the RawPath **with that event's
> EventId** (Part 9 §5.7.3). The event's `ActiveState/Id` + `AckedState/Id` are selected and turned into the
> `Raise`/`Acknowledge`/`Clear`/`Retrigger` kinds the host projector consumes (without a kind no upstream alarm could ever
> show active); the kinds are emitted from the state **last told to the host** per RawPath, so an identical re-delivery
> emits nothing (no re-raise, which would un-ack). Condition **branch** events (non-null `BranchId`) are ignored.
> **`ConditionRefresh`** is called after the event item is created, after every in-place reconnect, and on a
> `RefreshRequired` event, so a condition already active upstream is reported at subscribe; `RefreshStart`/`RefreshEnd`
> markers are dropped. A server without it (`BadNotSupported`/`BadMethodInvalid`/…) is logged once and tolerated.
> Last-told state survives a re-initialise (the host re-subscribes the same set over nodes it did not rebuild) and is
> forgotten when the subscribed set changes (the host rebuilt, recreating the nodes inactive). Index keys are server-stable (`nsu=`), so a namespace reorder across a reconnect keeps
> matching. docker-dev seeds an opc-plc driver (`MAIN-opcua`); the alarm tag is
> created only when `@OpcPlcAlarmSourceNodeId` is set in `docker-dev/seed/seed-clusters.sql`.
> This driver does **not** implement `IRediscoverable` — there is no
> push-driven rediscovery signal from a remote OPC UA server in this driver.
> `IHistoryProvider` is implemented by no other driver; history reads for every