Joseph Doherty
803f4e6efe
`Driver.Sql.Browser` referenced the runtime `Driver.Sql` project. The AdminUI references that browser, so the whole SQL driver runtime — and `ZB.MOM.WW.OtOpcUa.Core` through it — sat in the AdminUI's build/deploy graph. This is the same layering violation #512 removed from the MQTT browser, in a second driver, and it is why #512's expected removal of `Core.dll` from the AdminUI's output did not happen. MEASURED, both directions, on a clean AdminUI build: before: ZB.MOM.WW.OtOpcUa.Core.dll + ZB.MOM.WW.OtOpcUa.Driver.Sql.dll present after: both absent The old csproj comment's premise was sound and survives — the dialect's catalog SQL *is* the browse engine, so it must be shared rather than duplicated. What was wrong was the conclusion that sharing it required referencing the runtime driver. `ISqlDialect`/`SqlServerDialect` depend on nothing in `Driver.Sql`, so they move to a `.Dialect` leaf that both consume. This is the `.Transport` shape, not the cheap one: `ISqlDialect` exposes `DbProviderFactory` and `SqlServerDialect` returns `SqlClientFactory.Instance`, so `.Contracts` (deliberately provider-free) cannot hold them. Assembly name is `.Dialect`; the NAMESPACE stays `ZB.MOM.WW.OtOpcUa.Driver.Sql`, matching the `Driver.Mqtt.Transport` precedent — the extraction cost zero `using` changes. Two dependencies the cut edge surfaced as the implicit ones they were: - The AdminUI itself read `SqlDriver.DriverTypeName` in three places — the tag editor map, the tag config validator, and the Sql address picker. All three now read `DriverTypeNames.Sql`, which is exactly what that constant resolves to and exactly the repoint `SqlDriverBrowser`'s own comment had deferred until a factory was registered against the shared constant. One exists now. - `SqlDriverFormContractTests` asserts the AdminUI form's emitted JSON against the runtime factory that reads it, so it genuinely needs the runtime driver. `AdminUI.Tests` now references it explicitly. A test project referencing a runtime driver is fine — tests are not in the AdminUI's deploy graph. New guard: `DriverBrowserLayeringTests` (Commons.Tests) scans the csproj graph of every `*.Browser` project in the tree, transitively. It reads csproj files rather than loaded assemblies because the cost is a build-graph cost — the compiler emits no assembly reference for an unused `ProjectReference`, so `MqttBrowserLayeringTests`' assembly-reference approach cannot see that case. The two are complementary and each now points at the other. Falsified three ways, each red then green again: the direct reference re-added to the browser; the same reference one hop out via `.Dialect` (proving the walk is really transitive); and both controls — browsers-discovered and references-parsed — which exist so an empty discovery cannot pass the absence assertion vacuously. #526's claim that the reference "carries no comment at all" was wrong; it carried a detailed one from the scaffold commit. Corrected on the issue and in the design doc's project table, which had recorded the deviation as deliberate. Claude-Session: https://claude.ai/code/session_015p7wGqy3YpZNCpDzTpGMKo
OtOpcUa
OPC UA server (.NET 10 AnyCPU) that exposes a fleet of industrial drivers as a single OPC UA address space. Drivers ship in-process for AVEVA System Platform Galaxy (via the sibling mxaccessgw repo), Modbus TCP, Siemens S7, Allen-Bradley CIP (ControlLogix / CompactLogix), Allen-Bradley Legacy (SLC 500 / MicroLogix), Beckhoff TwinCAT (ADS), FANUC FOCAS, OPC UA Client (gateway), and MQTT (broker subscribe; Sparkplug B in progress).
A cross-platform client stack (.NET 10) — shared library, CLI, and Avalonia desktop app — connects to any OPC UA server.
Architecture
OPC UA Clients (CLI, Desktop UI, 3rd-party)
|
v
+-------------------------------------+
| OtOpcUa.Server (.NET 10 AnyCPU) |
| address space + capability fan-out|
+-------------------------------------+
| | | | | | | |
Galaxy Modbus S7 AbCip AbLeg TwinCAT FOCAS OpcUaClient MQTT
|
v
mxaccessgw (sibling repo, gRPC)
|
v
MXAccess COM (x86 worker, on AVEVA box)
Galaxy is the only driver with an external runtime: it speaks gRPC to a separately installed mxaccessgw server (sibling repo at c:\Users\dohertj2\Desktop\mxaccessgw\) which owns the MXAccess COM apartment and the x86/STA bitness constraint server-side. Everything in this repo is platform-agnostic .NET 10.
Prerequisites
- .NET 10 SDK (server, drivers, clients all target .NET 10)
- SQL Server reachable for the central config DB
- For Galaxy specifically: a running
mxaccessgwdeployment — see docs/v2/Galaxy.ParityRig.md - For historian read-back / alarm history / continuous historization: a running
ZB.MOM.WW.HistorianGatewaydeployment (the sole historian backend; consumed as theZB.MOM.WW.HistorianGateway.ClientgRPC package). It must runRuntimeDb:Enabled=true+RuntimeDb:EventReadsEnabled=true, and the API key must carryhistorian:read+historian:write+historian:tags:writescopes.
Quick Start
dotnet restore ZB.MOM.WW.OtOpcUa.slnx
dotnet build ZB.MOM.WW.OtOpcUa.slnx
dotnet test ZB.MOM.WW.OtOpcUa.slnx
# Run the server in dev (foreground)
dotnet run --project src/Server/ZB.MOM.WW.OtOpcUa.Host
The server starts on opc.tcp://localhost:4840 with the None security profile. Configure Security.Profiles in src/Server/ZB.MOM.WW.OtOpcUa.Host/appsettings.json to enable Basic256Sha256-Sign or Basic256Sha256-SignAndEncrypt. See docs/security.md.
Install as Windows Services
Production deployment is driven by scripts/install/Install-Services.ps1, which registers the OtOpcUa server service under a chosen service account. Historian support requires a separately deployed ZB.MOM.WW.HistorianGateway and Galaxy support a separately installed mxaccessgw — neither this repo nor the install script provisions them.
.\scripts\install\Install-Services.ps1 `
-InstallRoot 'C:\Program Files\OtOpcUa' `
-ServiceAccount 'DOMAIN\svc-otopcua'
The historian backend is the external ZB.MOM.WW.HistorianGateway (not installed by this script). See the script header and docs/ServiceHosting.md for full options.
Client CLI
dotnet run --project src/Client/ZB.MOM.WW.OtOpcUa.Client.CLI -- connect -u opc.tcp://localhost:4840
dotnet run --project src/Client/ZB.MOM.WW.OtOpcUa.Client.CLI -- browse -u opc.tcp://localhost:4840 -r -d 3
dotnet run --project src/Client/ZB.MOM.WW.OtOpcUa.Client.CLI -- read -u opc.tcp://localhost:4840 -n "ns=2;s=SomeNode"
dotnet run --project src/Client/ZB.MOM.WW.OtOpcUa.Client.CLI -- write -u opc.tcp://localhost:4840 -n "ns=2;s=SomeNode" -v 42
dotnet run --project src/Client/ZB.MOM.WW.OtOpcUa.Client.CLI -- subscribe -u opc.tcp://localhost:4840 -n "ns=2;s=SomeNode" -i 500
See docs/Client.CLI.md and docs/Client.UI.md.
Documentation
Architecture deep-dives
| Topic | Doc |
|---|---|
| OPC UA server composition, namespace fan-out, Polly invoker | docs/OpcUaServer.md |
| Address space layout | docs/AddressSpace.md |
| Read / Write dispatch (driver vs virtual vs scripted-alarm) | docs/ReadWriteOperations.md |
| Incremental sync (driver-backend rediscovery + config publishes) | docs/IncrementalSync.md |
| Service hosting (Server + Admin; external HistorianGateway backend) | docs/ServiceHosting.md |
| Security (transport, LDAP, certificates) | docs/security.md |
| Redundancy | docs/Redundancy.md |
| Status dashboard | docs/StatusDashboard.md |
Drivers
| Topic | Doc |
|---|---|
| Driver specs (per-driver capability surface, config, addressing) | docs/v2/driver-specs.md |
| Galaxy driver | docs/drivers/Galaxy.md |
| Modbus / S7 / AbCip / AbLegacy / TwinCAT / FOCAS / OpcUaClient / MQTT | docs/drivers/ |
| Galaxy parity rig (mxaccessgw setup) | docs/v2/Galaxy.ParityRig.md |
| Galaxy performance + tracing | docs/v2/Galaxy.Performance.md |
Clients
| Topic | Doc |
|---|---|
| Client CLI | docs/Client.CLI.md |
| Client UI (Avalonia desktop) | docs/Client.UI.md |
v1 archive
The original v1 in-process MXAccess docs (Galaxy.Host topology, Configuration env vars, AlarmTracking, DataTypeMapping, HistoricalDataAccess, Subscriptions, etc.) are preserved under docs/v1/ — historical reference only. PR 7.2 retired the v1 architecture on 2026-04-30; current state is documented in the sections above.
License
Internal use only.