Records the feasibility-verified plan to capture the two remaining buffers (regular-tag
RegisterTags btTagInfos + AddNonStreamValues btInput):
- 2023 R2 aahClientManaged.dll is self-contained mixed-mode C++/CLI (only Windows + VC++
runtime native imports) — loadable in a net481 x64 process, no AVEVA install needed.
- gRPC routes through the managed Archestra.Historian.GrpcClient.dll, so the byte[] payloads
are capturable by IL-rewriting GrpcHistoryClient.RegisterTags / AddNonStreamValues (dnlib,
the instrument-wcf-writemessage pattern; rewrite a copy, never the originals).
- Connection is reflection-drivable: HistorianAccess.OpenConnection(HistorianConnectionArgs)
with ConnectionMode=HistorianConnectionMode.Historian (the gRPC mode), TcpPort=32565, cert.
- gRPC runtime deps (Grpc.Net.Client / Grpc.Core.Api / Google.Protobuf / ...) are present in
msi-extract/ArchestrA/Toolkits/Bin/x64.
- Risk: the C++ AddNonStreamedValue TagNotFoundInCache(129) gate (the 2020 D2 blocker) may
block btInput; mitigation = read the tag first. RegisterTags is emitted before that gate.
Build order documented (read-only connect -> IL-rewrite -> write capture -> serializer ->
commit+read-back -> AddHistoricalValuesAsync), each live step gated on per-action auth.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Joseph Doherty
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