## Summary
Backports the fix for ServerTimestamp updating on Read operations for
stored/static nodes to master378 (1.5.378), addressing issue #4257 (part
2).
## Details
- In CustomNodeManager and CoreNodeManager, ensure ServerTimestamp is
stamped with the read time for stored/static nodes whose SourceTimestamp
is older than eadTime (e.g. after a Write).
- Retain matching SourceTimestamp and ServerTimestamp for dynamically
produced values generated during Read (such as ServerStatus children).
- Adds unit test
ReadStaticVariableStampsFreshServerTimestampAfterWriteAsync in
ReferenceServerTest.cs to verify that after writing to a static
variable, subsequent reads return ServerTimestamp stamped with the
current read time.
Fixes#4257 (ServerTimestamp behavior)
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
This pull request modernizes the OPC UA .NET codebase and tests, removes .NET Standard 2.0 support from certificate/security code, and updates test code to use C# 12 and .NET 8+ features for clarity and maintainability.
- Certificate and BouncyCastle interop files (e.g., CertificateBuilder.cs, X509Extensions.cs, X509SignatureFactory.cs) are refactored to drop NETSTANDARD2_0 support and use modern .NET APIs and conditional compilation.
- Test code across the codebase is updated to use default, strongly-typed Parse methods, collection expressions, and improved async/await patterns.
- Exception handling and assertions in tests are modernized, and test method naming is made consistent with Async suffixes.
- The project and build files are updated to clarify Roslynator analyzer usage and remove obsolete netstandard tags.
- General code and test cleanup includes improved null safety, type safety, and removal of deprecated or unused code.
Refactor to make OPC UA server subscription and monitored item management fully asynchronous, improving scalability and responsiveness. All key methods in ISubscription, ISubscriptionManager, and related classes are now async, with synchronous counterparts removed.
Suciu Mircea Adrian