Joseph Doherty
7f53bd96ec
Five MQTT tracker items — four AdminUI/authoring defects plus the .Browser layering exception. No runtime driver behaviour changes. #513 payloadFormat in a Sparkplug blob. MqttTagConfigModel.ToJson wrote the key unconditionally. Sharper than the issue states: PayloadFormat is the one Plain field with a NON-NULLABLE typed backing, so the write did not preserve a retyped tag's leftover — it INVENTED "payloadFormat":"Json" in a Sparkplug tag that never had one. Now Plain-only; preserve-unknown-keys is pinned unchanged. #509 slashed Sparkplug metric names. The mapper already carried metricName verbatim; only the tag Name (a RawPath segment) tripped RawPaths.ValidateSegment, which refused the batch whole — including Node Control/Rebirth, mandatory on every Sparkplug edge node. ToRawSegment coerces the Name and leaves the address untouched. Coercion is not injective, so DescribeNameCollisions refuses a colliding set BY NAME: silently merging two metrics into one tag would be worse than the refusal it replaces. Applies to every driver, not just MQTT — the argument is about what a Name is, not about who produced it. The sanitiser is pinned against RawPaths.ValidateSegment rather than a copied charset. #510 stale rebirth affordance. _canRebirth was probed once at browse-open and sessions are reaped for idleness, so a modal left open offered an action whose token no longer resolved. Re-probed on arm AND on confirm (the reap can land between the two, and confirm is the one path that publishes to a live broker); the affordance retires with an explanation instead of vanishing or erroring. #514 rebirth on a quiet plant. The tree is birth-driven and births are never retained, so a plant that birthed before the window opened showed an empty tree — and the scope came only from a tree selection, so the one action that would fill the tree could not be armed. The session already accepted a bare {group}/{edgeNode} ("the prime rebirth target"); this adds the affordance. Edge-node scope only, not a group broadcast. The rule is extracted to SparkplugRebirthScope so it is testable — this repo has no bUnit — and is advisory: the session re-resolves and refuses before publishing. #512 .Browser -> .Driver layering. TWO extractions were needed, not the one the issue anticipated: it costed this as "the client-options builder", but the browse session decodes births itself, so moving only that would have left the reference exactly where it was. - MqttClientOptionsFactory (TLS, PEM CA-pin validator, credentials, protocol mapping) -> new leaf .Transport project. NOT .Contracts: that is deliberately transport-free and MqttClientOptions is an MQTTnet type, so .Contracts would hand MQTTnet to ControlPlane. This is the fix the .Browser csproj comment had already prescribed, against the issue's suggestion. - The Sparkplug protocol layer (SparkplugTopic/MessageType, SparkplugCodec, RebirthRequester) -> .Contracts, beside the Tahu wire schema it encodes. Still exactly one copy of the TLS/CA-pin logic; MqttBrowserLayeringTests guards the graph both ways. Measured, not assumed: Driver.Mqtt.dll, Polly.Core and Serilog are now absent from the AdminUI's output. Core.dll remains, because Driver.Sql.Browser has the SAME violation, undocumented — the old comment blamed this browser for Core and was wrong. Filed separately rather than fixed in passing. Full suite green apart from the 7 known pre-existing failures (4 AbLegacy integration, compose profiles not up; 3 Host.IntegrationTests). 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.