The mxaccessgw OnWriteComplete correlation is live (server b948e69, worker
53f69cd — all four unary write kinds), so every write reply's statuses[0] now
carries the real COM commit outcome. Live-gating the cutover on windev found
and fixed three defects:
- StatusCodeMap.FromMxStatus truncated the correlated failure row's MxStatus
detail code to a byte (1007 & 0xFF = 239 -> OPC DA Good band), mapping a
REFUSED write to Good. New invariant: a row that is not IsSuccess() never
maps Good — details > 0xFF (and contradictory Good-band substatuses) route
by category (SECURITY_ERROR -> BadUserAccessDenied, named const covered by
StatusCodeParityTests; COMMUNICATION/CONFIGURATION keep their codes).
- The borrow-from-subscription-registry write optimization could never commit:
a subscription handle is plain-advised, and MXAccess refuses both the
no-login write through it (SECURITY_ERROR detail 1008, live-captured) and
the supervisory advise upgrade (E_INVALIDARG) — one advise per HANDLE, not
per attribute. Removed: writer subscribedHandleSource ctor param + borrow
branch, GalaxyDriver wiring, SubscriptionRegistry.TryResolveItemHandle +
its forward index and test file. The writer always AddItems its own
supervisory-advised handle, which commits fine while the same attribute is
subscribed (live-proven; pinned by the new write-while-subscribed smoke).
- (gateway-side, fixed there) the correlation initially covered WriteSecured
only, while the dominant no-login path emits plain Write.
Live gate, all legs PASSED against windev: happy write Good off a confirmed
status row with galaxy.writes.unconfirmed + advise_failed both FLAT; read-only
refusal surfaces Bad-family (the #5 node-revert input Galaxy could never
produce before); WriteCompletionWaitMilliseconds=0 control -> provisional Good
+ metered unconfirmed (override removed after, restoration re-verified). New
env-gated smokes: Live_correlated_write_statuses_confirm_commit_and_surface_refusal,
Live_write_to_subscribed_tag_commits_via_own_handle (replaces the borrow
smoke), GatewayGalaxyWriteMeterLiveTests (run filtered — meters are
process-wide).
Subscribe a real tag, register its gateway item handle, write via the
registry-wired writer: asserts the borrowed-handle write commits Good with
AddItemCallCount==0 (control with no source: ==1). Proves the subscription
handle is usable for a committing no-login supervisory write. Skip-gated on
MXGW_ENDPOINT + GALAXY_MXGW_API_KEY; verified live vs 10.100.0.48:5120 (3/3).
Code-review refinement of the live-gw read-back helper: complete a
TaskCompletionSource<double?> from the pump instead of a captured local (explicit
cross-task visibility), pass bufferedUpdateIntervalMs:0 (Advise snapshot needs no
SetBufferedUpdateInterval), and document the Advise->OnDataChange filter. Live re-verified 2/2.
Skip-gated (MXGW_ENDPOINT + GALAXY_MXGW_API_KEY) like GatewayGalaxyAlarmFeedLiveTests.
Covers the two seams the unit suite can only fake in isolation:
- reopen: RecreateAsync + InvalidateHandleCaches re-establish write handles
- write: no-login supervisory write commits + persists (fresh-session read-back)
Live-verified 2/2 against 10.100.0.48:5120 (2026-06-14); skips cleanly in CI.
Joseph Doherty