Joseph Doherty
0771664092
rust / build / test / clippy / fmt (push) Has been cancelled
Investigation triggered by "Publish returns 0 values where .NET sees real
values" against the local AVEVA install.
Three findings:
1. SampleInterval unit: the wire field is **milliseconds**, not 100-ns
ticks. The .NET reference (MxAsbDataClient.cs:441) defaults to
`ulong sampleInterval = 1000` and the probe passes `subscribeSampleMs`
directly through that surface. Sending 10_000_000 (1s in 100-ns ticks)
makes MxDataProvider schedule the next sample ~2.8 hours out; Publish
polls always come back empty until the misinterpreted timer expires.
Fixed in `examples/asb-subscribe.rs` (sample_interval_ticks →
sample_interval_ms = 1000) and clarified in
`MinimalMonitoredItem.sample_interval`'s doc comment with the live-2026-05-06
evidence.
2. result_code=32 is `AsbErrorCode.PublishComplete`
(`AsbResultMapping.cs:37`) — informational, not a fatal error. .NET's
`ToResult` (cs:122-129) explicitly treats it like Success.
`ArchestrAResult.ErrorCode` and `ResultCode` are aliases for the same
`resultCodeField` (cs:424-434), so `publish[i]_error=0x00000020` in
the .NET probe trace = `result_code=Some(32)` in our trace = the same
thing. Already handled correctly via the F26 narrower-bail fix
(commit 983f029) — no code change needed.
3. **F34 filed** for the residual gap: with both sides seeing
result_code=32 + success=false, .NET extracts a value but we extract
zero. Three open hypotheses (wire-shape mismatch / payload-locator
bug / MonitoredItemValue byte-layout bug); all need a middleman
asb-relay.rs trace between the .NET probe and MxDataProvider to
confirm. Adjacent symptom: AddMonitoredItemsResponse Status reads as
0 items where .NET sees 1 — likely the same root cause; one fix
should close both.
Live re-runs to validate the new sample-interval unit were blocked by
the documented F32 InvalidConnectionId transient (the
pending-connection table on MxDataProvider fills up after many
back-to-back test cycles; clears after a 30s+ cool-down).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>