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Marc SchierandCopilot
1d2a7c8d00
# Description Stream socket semantics permit a successful vectored send to complete after fewer bytes than requested. The previous one-shot send treated that legal partial completion as a closed connection and left the remaining bytes unsent, risking truncation of an OPC 10000-6 UA-TCP message chunk. The transport now continues sending while advancing across copied buffer segments, without mutating the caller's `BufferCollection`, and rejects zero-byte or impossible over-reported sends. ## Validation - `TcpByteTransportTests`: net10.0 (10 passed), net48 (10 passed). - `git diff --check` passed. ## Related Issues - Split from #4021. ## Checklist _Only verified claims are checked._ - [ ] 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. - [ ] I have added all necessary documentation. - [x] 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: Copilot <223556219+Copilot@users.noreply.github.com>