Cristi PogaceanandCopilot Autofix powered by AI
9b8a3b1188
# Description Preserve populated derived node children through optional initialization and give copied children independent ownership by their copied parent. - Track initialization from a source in `NodeState` and guard generated optional-default recreation without removing the optional initialization hook. - Reuse `CloneChild` for dynamic children, generated typed children, and method argument properties. Preserve the clone root's existing external parent. - Add cross-model initialization/copy regressions, method-argument and nested-child ownership tests, and inherited alarm-subtree checks. This PR contains only the six files for this fix group. Certificate-store, runtime-type-loader, publish-queue and transport-exception fixes are separate work. ## Related Issues Fixes #4525. Fixes #4526. ## Validation Fresh focused Release/net10.0 checks on the final base: | Fixture | Passed | Failed | Skipped | | --- | ---: | ---: | ---: | | CrossModelInstanceTypeDefinitionGeneratorTests | 9 | 0 | 0 | | Types NodeStateTests | 227 | 0 | 0 | | Core StateTypesTests | 13 | 0 | 0 | All three test commands exited 0. `git diff --check` and the changed-file diagnostic check are clean. Regression proof was also executed in the isolated worktree: with the three production changes reversed, six generator cases failed with the missing derived Temperature child while three controls passed; two copy cases failed parent-identity assertions while the external-parent/absent-arguments control passed. The production fix was restored and the focused checks are green. The retained red runs preceded the later upstream synchronization; the affected production paths were unchanged by that synchronization. Windows win-x64 NativeAOT publish and native execution also passed: main 178/178, Historian 2/2, MCP 3/3, no skips, every invocation exit 0. These native runs preceded the final CTT-configuration/notes-only fast-forward; this PR's six files were unchanged. Local validation is intentionally change-scoped for this work, with the full matrix and repository-wide checks left to PR CI. Repository guidance and test assertions/timeouts were not modified. Local commands used a NuGet v2 source override and disabled audit only on the command line; CI feed/audit policy is unchanged. Earlier broad attempts are not claimed as a completed local gate: an unmodified-base durable restart timeout was reproduced before synchronization (the later durable run passed), and the net48 runner stalled after recording passing client tests. A direct client retry subsequently exited 0, but the full net48 matrix was not completed. Those results are not substituted for the focused evidence above. ## Checklist - [x] I have signed the CLA and read the CONTRIBUTING doc. - [x] I have added regression tests and demonstrated failure without the production fix. - [x] The focused tests pass; no new compiler diagnostics were reported by those builds. - [ ] Coverage and the full net48/net10.0 matrix are verified by PR CI. - [ ] All CI, CodeQL, and review feedback is addressed. --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
OPC UA .NET Standard Stack
🆕 This is version 2.0 of the OPC UA .NET Standard Stack (current
master).Looking for the supported 1.x release? It lives on the
master378branch (last release:1.5.378). All new feature work happens here onmaster;master378continues to receive security and critical-bug fixes for the 1.x line.
The official OPC Foundation reference implementation of OPC UA for .NET — a certified, cross-platform stack with client, server, PubSub, GDS, complex types, and source-generated tooling. Used in production across industrial control, manufacturing, energy, and IoT systems.
📦 What it is
- A full-stack OPC UA implementation — Core / Client / Server / PubSub / GDS / LDS / Complex Types / Device Integration / Positioning libraries built on .NET, with UA-TCP and HTTPS transports.
- Cross-platform — runs on .NET 10, .NET 9, .NET 8 (LTS), .NET Framework 4.8, and .NET Standard 2.1; ships Native-AOT-friendly assemblies.
- Certified for compliance — the reference server has been certified through an OPC Foundation Certification Test Lab and is continuously verified against the latest Compliance Test Tool (CTT).
- Companion-spec coverage — Part 9 (Alarms & Conditions), Part 11 (Historical Access), Part 13 (Aggregates), Part 16 (State Machines), Part 17 (Alias Names), Part 18 (Role Management), Part 20 (File Transfer), Part 100 (Device Integration), Parts 210/211 (Relative Spatial Location and Global Positioning), OPC-10030 (ISA-95 Common Model) with OPC-10031-4 Job Control V1/V2, OPC 30270 / OPC UA for Asset Administration Shell V2 and V3, OPC 10100-1 (WoT Connectivity), OPC 40001-1 (Industrial Automation), OPC 40010-1 (Robotics).
- Modern developer surface — first-class
Microsoft.Extensions.DependencyInjectionhosting (services.AddOpcUa()), fluent server + client builders, source-generated NodeManagers and DataTypes, and an MCP server so LLMs / Copilot can drive an OPC UA client.
For the full feature breakdown see OPC UA Profiles and Facets and the What's New in 2.0 tour.
🚀 Getting started
You need the .NET 10 SDK to build the repo. From the repository root:
dotnet restore UA.slnx
dotnet build UA.slnx
For the supported target frameworks and platform notes see
the Developer Guide. The official NuGet packages
are published to nuget.org under the OPCFoundation.NetStandard
prefix — the meta package
OPCFoundation.NetStandard.Opc.Ua
pulls in everything, or reference individual packages directly, e.g.
OPCFoundation.NetStandard.Opc.Ua.Client for clients or
OPCFoundation.NetStandard.Opc.Ua.Server for servers. Preview builds from
every successful master build are available from the
GitHub Packages NuGet feed,
which is the only feed they are published to. nuget.org receives a version
only through a manually approved promotion from a release/<major>.<minor>
branch — that is where the 2.0.0-preview.N packages already on nuget.org
came from, via the earlier release/2.0.0 line. To use those, enable
prerelease packages and float with 2.0.0-preview.* until 2.0.0 is
released. The XRegistry, WoT Connectivity, Vision, Robotics,
Redundancy, Positioning, OpenUSD, ISA95, AI, and DI package families remain
preview packages when the root version is promoted to a stable version, and
keep their own -preview.N versions on nuget.org. See
docs/ReleaseProcess.md for how and when stable
versions are released.
Samples
The stack also includes a large collection of platform-independent sample applications that turn its core services and companion models into runnable client/server workflows. More applications, including platform-specific examples, are available in the companion OPC UA .NET Samples repository.
Developer tools
- OPC UA MCP Server — installable .NET tool and container that exposes OPC UA client operations as MCP tools for LLMs and Copilot. The tools also ship as libraries (
…Opc.Ua.Mcp.Core,.PubSub,.Diagnostics,.PubSub.Diagnostics) so an application can embed them next to its own MCP tools.
🔧 Migrating from 1.5.378 to 2.0
The 2.0 release introduces breaking API changes, and comes with a full prescriptive migration guide that links to per-area documentation for the migration sub-topics.
Most of the mechanical migration work is automated:
OPCFoundation.NetStandard.Opc.Ua.MigrationAnalyzerNuGet — install it in your project to get 26 analyzer rules throughUA0030(excludingUA0013,UA0016,UA0017, and the shim-onlyUA0029) plus one-click code fixes for the patterns in the guide. Setup steps are in the package's NugetREADME.md.- Migration agent skill — the
opcua-v20-migrationskill walks Copilot / Claude / any coding agent through installing the NuGet, runningdotnet format analyzersto apply auto-fixes, and handling the small residual manual patterns. The skill knows which sub-doc to load for each symptom so it stays context-efficient.
Copilot CLI discovers the skill automatically inside a clone. To install it for use in any repository:
copilot plugin marketplace add OPCFoundation/UA-.NETStandard
copilot plugin install opcua-v20-migration@opcua-dotnet
If you are still on 1.x and not ready to upgrade, stay on the
master378
branch — it continues to receive security and critical-bug fixes.
🤝 Contributing and license
Community contributions are welcome. Fork the repository, make your changes on a branch, and open a pull request; see CONTRIBUTING.md for the contribution workflow.
Contributors must sign the OPC Foundation Contributor License Agreement (CLA). The CLA "I AGREE" gate is presented automatically on your first PR.
The project is licensed under the OPC Foundation MIT License. Report security vulnerabilities via the process documented in SECURITY.md.
📚 Further reading
- Documentation index — every per-feature doc with a one-line description.
- What's New in 2.0 — narrative tour of the 1.5.378 → 2.0 changes grouped by theme and layer.
- OPC UA Profiles and Facets — facets / transports / security policies the stack implements.
- Migration Guide — prescriptive
per-version migration reference (links to
docs/migrate/2.0.x/). - OPC UA Online Reference — the official OPC 10000 series specification index.
- Preview Nuget package feed —
prerelease builds from every successful
masterbuild.