Live-probed both R1.3 and R1.4 against a real 2023 R2 server over the gRPC
StatusService; implemented the one that carries an evidence-backed value.
R1.3 GetServerTimeZoneAsync — SHIPPED:
- StatusService.GetSystemTimeZoneName(uiHandle) returns the real server zone
over RemoteGrpc (the 2020 WCF op is a client-side stub returning empty).
- HistorianGrpcStatusClient.GetSystemTimeZoneNameAsync -> dialect routing ->
public HistorianClient.GetServerTimeZoneAsync. Non-gRPC transports fail
closed with ProtocolEvidenceMissingException (no empty-string lie).
- Golden message-shape unit test + non-gRPC guardrail unit test + gated live
test. 271 unit tests pass.
R1.4 GetHistorianInfoAsync (EventStorageMode) — bounded out on gRPC too:
- gRPC GetHistorianInfo is the same named-value query as 2020 WCF (only
HistorianVersion resolves); EventStorageMode + 7 variants fail on both
GetHistorianInfo and GetSystemParameter. The 518-byte struct is filled by a
native vtable+648 HCAL call, not the gRPC op (per the 2023 R2 decompile), so
the field is never on the wire. Not shipped on any transport. Closes the
roadmap's open "build against a live 2023 R2 server" caveat.
Also correct the stale M3 roadmap section: D2 already proved
Transaction.AddNonStreamValues* rides the storage-engine pipe (STransactPipeClient2
-> aaStorageEngine), not WCF — same wall as R4.2 — so M3-over-WCF is blocked, not
"the path that is NOT the gated cache push".
Docs: hcal-roadmap.md, wcf-historian-info.md, wcf-status-localhost.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
DelTep (extended-property delete) — wire format captured + serializer
golden-proven, but live delete is server-blocked and NOT exposed publicly:
- Captured the DelTep inBuff via a cross-session trick (harness add-tep gains
--tep-skip-add + read-for-sync before --tep-delete; Capture-DeleteTagExtended
Properties.ps1 / decode-del-tep-capture.py). Layout = same group framing as
AddTEx but property-name-only (no 0x43 value) + 0x00 group trailer.
- SerializeDeleteRequest + 4 golden tests pin the server-accepted buffer.
- A decisive experiment shows SDK-added properties ARE deletable (the native
client read-syncs and deletes one), so SDK-add is complete; the SDK's own
DelTep is rejected by CHistStorage::DeleteTagExtendedProperties even with
byte-identical inBuff, matching mode/handle, GetTgByNm+GetTepByNm prime, open
channel, and 60s retries. Root cause: the native multiplexes services over one
connection (per-connection working set); the SDK's per-service WCF channels
don't reproduce it. Kept as documented-but-blocked internal orchestrator path;
no public HistorianClient delete API.
Bounded out with evidence (no code; docs + roadmap + probe):
- R1.12 localized-property write — no op on 2020 (mirror of R1.6); no
*LocalizedPropert*/TagLocalized* symbol in any current/*.dll.
- R1.13 non-analog tag create — GATED; native AddTag rejects every non-analog
type client-side (ValidationFailed, before any WCF op): SingleByteString,
DoubleByteString, Int1 all fail, Float works. No Discrete type in the native
enum, no TagType setter. No wire request to capture.
- R1.3 timezone + R1.4 EventStorageMode — re-confirmed 2023R2/gRPC-only from
the Runtime DB schema (no timezone param, no EventStorageMode anywhere) and a
parameter-op probe (GetSystemParameter + GETRP return null/throw for every
candidate; only HistorianVersion works).
238 unit tests pass; full solution builds with 0 warnings.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Execute HCAL roadmap R1.2 (GetRuntimeParameterAsync) end-to-end, and in doing so
discover that the "string-handle wall" blocking R1.1/R1.4/R1.5/R1.6 was a handle
FORMAT bug, not a missing native session/filter registration.
R1.2 (shipped, live-verified):
- Captured native GetRuntimeParameter -> WCF op aa/Stat/GETRP (string-handle op,
GETHI's shape), via scripts/Capture-RuntimeParam.ps1 + instrument-wcf-{write,read}message.
- HistorianRuntimeParameterProtocol serializes pRequestBuff (54 67 01 00 + uint
nameCount + per-name uint charCount + UTF-16) and parses pResponseBuff (version +
uint resultCount + CRetVariant 0x43 VT_BSTR + uint16 len + uint16 charCount + UTF-16).
- IStatusServiceContract2.GetRuntimeParameter (GETRP) op; HistorianWcfStatusClient
passes the Open2 storage-session GUID as the string handle, UPPERCASE.
- Public HistorianClient.GetRuntimeParameterAsync(name) via the dialect.
- Golden WcfRuntimeParameterProtocolTests + gated live test; returns HistorianVersion.
String-handle wall RESOLVED (proven, public APIs deferred):
- The Open2 storage GUID works as the string handle when sent UPPERCASE
(ToString("D").ToUpperInvariant()); earlier "blocked" probes used lowercase.
- Live-probed GETHI (R1.4) -> returns data; ExeC (R1.1) -> Retr.GetV prime -> ExeC ->
GetR returns a BinaryFormatter-serialized .NET DataTable. Gated
StringHandleProbeDiagnosticTests + scripts/Capture-ExecSql.ps1 + exec-sql harness scenario.
- Docs flipped: wcf-string-handle-wall.md RESOLVED banner; roadmap R1.1/R1.4 reachable,
R1.5/R1.6 likely; wcf-status-localhost.md GETRP section.
- R1.1/R1.4 public APIs NOT shipped: ExeC needs a GetR paging loop + a BinaryFormatter-
stream parser (BinaryFormatter is removed from .NET 10); GETHI full-info struct needs
its own capture.
223 unit tests pass; gated live tests green against the local 2020 Historian.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Live-probed both against the local Historian 2020 (WCF):
- R1.3 GetServerTimeZoneAsync: Status.GetSystemTimeZoneName returns rc=0 with
an empty value under a real authenticated handle — a client-side stub in the
GetServerTime family. gRPC/2023R2-only. Reverted the implementation.
- R1.1 ExecuteSqlCommandAsync: Retrieval.ExeC returns native error type 4 /
code 51 (InvalidParameter); the contract-3 string-handle ops require an
unmapped native session/filter registration step (the StartTagQuery wall).
Adds an M1a re-classification note steering future work toward proven
uint-handle / already-wired ops (R1.4 GETHI next) over string-handle ops.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Full read-only SDK (src/AVEVA.Historian.Client) implementing the CLAUDE.md required
surface against AVEVA Historian's binary WCF protocol — no native AVEVA runtime
dependency. All operations live-verified against a local Historian:
- ProbeAsync, ReadRawAsync, ReadAggregateAsync, ReadAtTimeAsync, ReadEventsAsync
- BrowseTagNamesAsync, GetTagMetadataAsync (17 native data-type codes mapped)
- GetConnectionStatusAsync, GetStoreForwardStatusAsync, GetSystemParameterAsync
- 108/108 unit + integration tests pass
Includes the reverse-engineering toolkit (tools/AVEVA.Historian.ReverseEngineering)
used to decode the protocol: WCF probes, IL inspection via dnlib, and IL-rewrite
instrumentation (instrument-wcf-{write,read}message etc.) plus the .NET Framework
trace harness (tools/AVEVA.Historian.NativeTraceHarness) for parity testing.
Sanitized handoff evidence under docs/reverse-engineering/. Native AVEVA binaries
(current/, aveva-install-x64/, aveva-install-x86/) are gitignored — fetch separately
from the AVEVA installer.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Joseph Doherty