5899354441
# Description Remove stock phrasing and correct misleading or inconsistent technical documentation. The initial two passes covered 367 Markdown files, followed by an interactive review of 169 editorial flags. The U5 interpretation originally deferred in that review has since received the upstream Mantis answer recorded by #4843; remaining server/spec follow-ups stay explicit in the CTT log. - Correct package responsibilities, migration steps, API names, ownership, protocol descriptions and links. Keep bundled migration guides synchronized. Preserve historical conclusions as historical records with separate re-check notes. - Provide at least two rendered TOC levels throughout `docs/`. Convert appropriate architecture figures to Mermaid without changing code examples, transcripts or historical quotations. - Address the October 19 feedback with concrete setup/migration instructions, corrected certificate paths and PubSub names, shorter repeated caveats, consistent XML comments, and a full review of the Concepts guide. Retain #4839's API corrections. - Integrate #4841's runtime/performance guidance and review incoming/recent prose. Preserve dated measurements rather than claiming new benchmark runs; clarify allocation ratios, startup-only processor settings, JIT warm-up and the benchmark commit's scope. Missing raw measurement artifacts and repeat ranges remain tracked by #4842. - Merge master through `e8c5d800a` in `32c6394b7`. Resolve the CTT log conflict using the updated Mantis states and OPC answers, retaining historical framing and re-checks for C28/C32/C43. - Address the latest naming/index feedback in `adb5bf693`: rename the guides to `docs/WotCon.md` and `docs/WotNodeSetConversion.md`; move the provider and DataType-declaration contracts into the conversion guide and remove `docs/WoT.md`. Rename `samples/DI` to `samples/Di` and `samples/Isa95` to `samples/ISA95`. Add content-index READMEs to Di, FluentApi, ISA95, Lds and PubSub; update solution entries, project references, Docker/CI paths, test fixture paths and documentation links with exact casing. **WoT guide scope.** This branch retains the detailed conversion guide that #4758 had replaced with an anchor stub. Conversion limits, verified document sets, preservation rules and provider ownership now live together in `WotNodeSetConversion.md`; binding/runtime guidance remains in `WotBindings.md` and `WotCon.md`. The design-rationale/test-ledger prose was shortened, the oversized argument-table cell moved into its section, and existing anchors preserved. **SDK policy is a separate, explicit user-directed change.** `global.json` sets a stable minimum of `10.0.400`, `rollForward: latestMajor`, and `allowPrerelease: false`. Newer major SDKs are permitted; CI's explicit SDK pins are unchanged. README, GettingStarted, DeveloperGuide and Recycling instructions reflect the possible analyzer differences. The image-contract regression fix accepts compatible stable SDK images instead of requiring exact equality with the floor. The latest four rename/index threads are resolved after publication. Three older threads remain open: universal obsolete-removal timing, unconditional nonce-strength wording, and a blanket Vision NativeAOT claim. Existing implementation/evidence constraints are explained in their inline replies. The two-level TOCs remain as requested. ## Validation - `git diff --check` and staged diff checks: passed. The untouched upstream AutoID NodeSet retains its provenance bytes, including two existing license-header trailing spaces. - `.\.azurepipelines\validate-migration-plugin.ps1`: passed; 15 bundled migration documents and manifests synchronized. - Documentation/path validation: **101** documents retain two rendered TOC levels (**2,228** entries), with idempotent formatting. **52** new relative links and their anchors passed exact-case checks. No tracked references to the old guide/sample paths remain. Both relocated provider-contract sections are preserved in the destination. - `dotnet sln UA.slnx list`: passed; shows the renamed Di/ISA95 projects and the existing FluentApi/Lds/PubSub projects. Updated solution and pump ProjectReference paths also passed exact-case existence checks. - Latest focused commands, run from the repository root: ```powershell # Passed: 61 channel send-order and reconnect tests. dotnet test tests\Opc.Ua.Core.Tests\Opc.Ua.Core.Tests.csproj -p:CustomTestTarget=net10.0 --filter 'FullyQualifiedName~UaSCBinaryChannelSendOrderTests|FullyQualifiedName~TcpReconnectKeyAgreementTests' --verbosity minimal # Passed: 5 pump datasheet tests; builds the renamed pump sample. dotnet test tests\Opc.Ua.Di.Tests\Opc.Ua.Di.Tests.csproj -p:CustomTestTarget=net10.0 --filter 'FullyQualifiedName~PumpDatasheetConformanceTests' --verbosity minimal # Passed: 4 repository NodeSet path/round-trip tests, including the moved pump models. dotnet test tests\Opc.Ua.Types.Tests\Opc.Ua.Types.Tests.csproj -p:CustomTestTarget=net10.0 --filter 'FullyQualifiedName~RepositorySourceSurvivesSerializedLinkedPartitionsAsync' --verbosity minimal # Passed: build, zero warnings/errors. dotnet build samples\ISA95\MinimalIsa95Server\MinimalIsa95Server.csproj -p:CustomTestTarget=net10.0 -f net10.0 --verbosity minimal # Passed: dependent sample-test project build, zero warnings/errors. dotnet build tests\Opc.Ua.WotCon.Samples.Tests\Opc.Ua.WotCon.Samples.Tests.csproj -p:CustomTestTarget=net10.0 -f net10.0 --verbosity minimal ``` Earlier focused integration checks passed 2,620 tests across AutoID, event queues/scheduling, source generation, MCP/package profiles and WoT. Both reviewed Mermaid diagrams rendered locally without network access. These checks are not a full solution run. The full solution has **not** been rerun for this review. Earlier `dotnet test UA.slnx -p:CustomTestTarget=net10.0 --verbosity quiet` did not pass: three AOT projects rejected VSTest and 20 Vision tests failed during graphics initialization with `OutOfMemoryException`. Remaining long-running tests were stopped at the user's request. A focused Vision rerun passed 558 tests and reproduced those 20 failures. The earlier `dotnet test UA.slnx -p:CustomTestTarget=net48 --verbosity quiet` was blocked by the former SDK pin and was not retried after the policy change. The user approved proceeding with those limitations documented; current remote CI is not claimed green. ## Related Issues - Follow-up #4842 tracks the requested 2.0.2+ benchmark/tuning and diagnostic-tool documentation refresh. #4841 supplies documentation and earlier results, not all newly requested measurements. - #4758 explains the conversion guide's earlier consolidation; the current provider contracts are now consolidated into `WotNodeSetConversion.md`. - #4839 supplies the reviewed API corrections; #4843 supplies the updated CTT issue record. - The original prose cleanup and SDK policy were user-requested without a source issue. No new runtime architecture is introduced by these documentation edits. ## Checklist _Put an `x` in the boxes that apply. You can complete these step by step after opening the PR._ - [ ] I have signed the [CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf) and read the [CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md) doc. - [ ] I have added tests that prove my fix is effective or that my feature works and increased code coverage. - [x] I have added all necessary documentation. - [ ] I have verified that my changes do not introduce (new) build or analyzer warnings. - [ ] I ran **all** tests locally using the **UA.slnx** solution against at least .net **framework** and .net **10**, and all passed. - [ ] I fixed **all** failing and flaky tests in the CI pipelines and **all** CodeQL warnings. - [ ] I have addressed **all** PR feedback received. --------- Co-authored-by: Roman Ettlinger <romanett98@gmail.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.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 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; ships Native-AOT-friendly assemblies.
- Conformance regression testing — the reference server is tested with the Compliance Test Tool (CTT) through the CTT regression workflow. These results identify regressions; they do not constitute product certification.
- Companion-spec coverage — Part 9 (Alarms & Conditions), Part 10 (Programs), 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), Part 110 (Asset Management Basics), 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), Part 200 (Industrial Automation), OPC 40001-1/-2/-3/-4/-101 (Machinery with Process Values, Job Management, Energy and Result Transfer), OPC 34100 (Energy Consumption Management), OPC 30081 (PA-DIM), OPC 40010-1 (Robotics), OPC 40100-1/-2 (Machine Vision control and asset management), OPC 40501-1 and OPC 40505 (Machine Tools and independent wireless peripherals), OPC 40210 (Geometric Measurement Systems, with its documented upstream Production-facet exception), OPC 40020-1 (Cranes and Hoists), OPC 40223 (Pumps and Vacuum Pumps), OPC 30010 (AutoID Devices), OPC 40200 (Weighing Technology) with OPC 30050 (PackML).
- Hosting and code generation —
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
To run a first OPC UA client and server, from NuGet packages or from the samples in this repository, follow Getting started. The documentation index then leads from the core concepts to advanced and experimental features.
The recycling operator console demonstrates live browser monitoring, native companion-specification inspection, material genealogy, and authorized controls over the synthetic recycling line.
You need a stable .NET SDK
version 10.0.400 or later to build the repo. global.json selects the
highest installed stable SDK, including newer major versions. 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
bundles a default set of stack packages; see its
package inventory.
Reference PubSub and other optional feature packages separately, or select
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, Robotics, CranesHoists,
Redundancy, Positioning, OpenUSD, and AI package families, the Vision.OpenUsd
renderer, and the Robotics MCP extension remain
preview packages when the root version is promoted to a stable version, and
keep their own -preview.N versions on nuget.org. This includes all CranesHoists
model/server/client/MCP packages and their Debug variants.
The Vision, MachineVision, MachineTool (including WMTP), and GMS
model/client/server packages and their MCP packages follow the root version
without a preview-only override;
development builds still inherit the root prerelease version. See
docs/ReleaseProcess.md for how and when stable
versions are released.
Samples
The platform-independent sample applications show how to use the stack's core services and companion models in 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 exposing OPC UA client operations to LLMs and Copilot. Embeddable libraries provide Part 4 services, PubSub, diagnostics, Robotics and Vision, plus industrial companion profiles for AMB, Machinery, Scales, Pumps, AutoID, Device Integration, ISA-95 and Positioning. The WoT and xRegistry profiles add asset/registry management and bounded document validation, planning and NodeSet conversion. Stack workflow profiles provide GDS/credential issuance, roles/users, files, alarms, history, schemas, and host-authorized PubSub and live WoT execution.
🔧 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 remaining manual changes. It selects the migration sub-document for each symptom.
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.