docs(phase4b): Modbus driver-type canonical + Galaxy nesting + FOCAS auto-scale (managed-backend caveat)

2026-06-16 19:58:11 -04:00
parent 6855be288f
commit 08a6551360
4 changed files with 17 additions and 7 deletions
@@ -100,6 +100,10 @@ The session-less alarm feed (`GatewayGalaxyAlarmFeed`) and alarm acknowledger (`
 - **Parity rig + dev-rig walkthrough**: see [docs/v2/Galaxy.ParityRig.md](../v2/Galaxy.ParityRig.md). The rig stands up a real `mxaccessgw` against a live Galaxy and exercises the full read / write / subscribe / rediscover path.
 - **Performance + soak**: see [docs/v2/Galaxy.Performance.md](../v2/Galaxy.Performance.md).

+## Browse Tree Shape
+
+`GalaxyDiscoverer` builds the OPC UA address space as a **true nested tree** by `parent_gobject_id`: each gobject folder is parented under its Galaxy parent folder rather than being emitted flat under the driver root. Parentage falls back gracefully — a gobject with `parent_gobject_id` of 0, a parent not present in the returned set, a self-referencing parent, or a cycle attaches directly to the driver root. This matches the Galaxy `ArchestrA` object hierarchy as seen in the IDE.
+
 ## Operational Notes

 - **MXAccess `ClientName` collisions**: two OtOpcUa instances sharing a `ClientName` cause the older Wonderware session to lose subscription state. Redundancy pairs (decision #149) enforce uniqueness via install scripts.