Extended the historical-write serializer from Float-only to all five analog types EnsureTagAsync
supports. Captured each type's "ON" buffer live from the native client (sandbox tag per type,
written + captured + deleted):
- The 4-byte value descriptor (C0 10 01 00) is CONSTANT across types — it does not encode the type.
- The value is u32(0) + native-width value, width by the tag's declared type:
Float->float32, Double->double64, Int2->int16, Int4->int32, UInt4->uint32.
HistorianHistoricalWriteProtocol.SerializeAddStreamValuesBuffer now takes the HistorianDataType and
encodes accordingly (unsupported types throw ProtocolEvidenceMissingException). The orchestrator
resolves the type from the tag-info NativeDataTypeDescriptor via MapDataType. Harness capture-write
gained --data-type. Golden-tested against all five live captures + the gated write/read-back test
validated each type end-to-end through the pure-managed SDK; 281 unit tests pass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Public HistorianClient.AddHistoricalValuesAsync(tag, values) inserts non-streamed original
(backfill) values for an existing tag over the 2023 R2 gRPC front door. The pure-managed SDK
wrote a value and read it back live (gated test AddHistoricalValuesAsync_OverGrpc_WritesAndReadsBack
PASSED against the real server).
- HistorianGrpcHistoricalWriteOrchestrator: write-enabled (0x401) session ->
RetrievalService.GetTagInfosFromName (resolves the per-tag GUID = the tag-info TypeId, and
registers the tag on the session) -> HistoryService.AddStreamValues("ON" buffer) per sample.
- HistorianHistoricalValue (public record: TimestampUtc, Value, OpcQuality=192).
- gRPC-only: non-RemoteGrpc transports throw ProtocolEvidenceMissingException (the 2020 WCF
non-streamed write is architecturally blocked, D2).
- Float value encoding only (the captured type); other types rejected by the serializer.
275 unit tests pass; the new gated live write/read-back test is green against the 2023 R2 server.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Joseph Doherty