No native AVEVA runtime dependency — aahClientManaged.dll / aahClient.dll are not required. The wire protocol is re-implemented in managed C#. Live WCF transports require Windows; offline tests and gRPC run cross-platform.

Quick start

using ZB.MOM.WW.SPHistorianClient;
using ZB.MOM.WW.SPHistorianClient.Models;

await using HistorianClient client = new(new HistorianClientOptions
{
    Host = "localhost",
    IntegratedSecurity = true,
    Transport = HistorianTransport.LocalPipe,
});

DateTime endUtc = DateTime.UtcNow;
DateTime startUtc = endUtc - TimeSpan.FromMinutes(10);

await foreach (HistorianSample sample in client.ReadRawAsync(
    "SysTimeSec", startUtc, endUtc, maxValues: 100))
{
    Console.WriteLine($"{sample.TimestampUtc:o}  {sample.NumericValue}  Q={sample.Quality}");
}

DI registration

// In Program.cs / Startup
services.AddZbSpHistorianClient(
    config.GetSection("Historian").Get<HistorianClientOptions>()!);

// Resolves HistorianClient (transient) from the container

Supported operations

Operation	Status
`ProbeAsync`	live-verified
`ReadRawAsync`	live-verified
`ReadAggregateAsync`	live-verified across the `RetrievalMode` enum (15 modes)
`ReadAtTimeAsync`	live-verified
`ReadBlocksAsync`	block history read
`ReadEventsAsync`	live-verified (typed event + property bag)
`BrowseTagNamesAsync`	live-verified
`GetTagMetadataAsync`	live-verified across many native data-type codes
`GetConnectionStatusAsync`	synthesized from authenticated probe
`GetStoreForwardStatusAsync`	synthesized defaults
`GetSystemParameterAsync`	live-verified
`EnsureTagAsync`	live-verified for analog `Float`; `Double`/`Int2`/`Int4`/`UInt4` supported
`DeleteTagAsync`	live-verified (see note below)

Note: Writing sample values is architecturally blocked — the Historian server cache only ingests from configured IOServer / Application Server pipelines. DeleteTagAsync server-side cascade may not always complete; use SMC as a fallback to clean up sandbox tags.

Transport matrix

Transport	Protocol	Platform	Verification
`LocalPipe`	WCF/MDAS over Net.NamedPipe	Windows-only	live-verified
`RemoteTcpIntegrated`	WCF/MDAS over Net.TCP + Windows auth	Windows-only	live-verified
`RemoteTcpCertificate`	WCF/MDAS over Net.TCP + TLS	Windows-only	`ProbeAsync` live-verified; deeper coverage pending
`RemoteGrpc`	gRPC (2023 R2)	cross-platform	unit-tested; live verification pending

Build and test

# From ZB.MOM.WW.SPHistorianClient/

dotnet build ZB.MOM.WW.SPHistorianClient.slnx
dotnet test  ZB.MOM.WW.SPHistorianClient.slnx

# Pack
dotnet pack  ZB.MOM.WW.SPHistorianClient.slnx -c Release -o ./artifacts

Offline unit tests (191 total) run on any OS. Live integration tests are gated by environment variables (HISTORIAN_HOST for WCF, HISTORIAN_GRPC_HOST for gRPC) and skip cleanly when unset. See CLAUDE.md for the full environment variable reference.