Joseph Doherty ac14ba9664 AB CIP PR 8 — IHostConnectivityProbe + IPerCallHostResolver. Per-device probe loop — when AbCipProbeOptions.Enabled + ProbeTagPath are configured, InitializeAsync kicks off one probe task per device that periodically reads the probe tag (lazy-init on first attempt, re-init on wire failure so destroyed native handles get recreated rather than silently staying broken), transitions Running on status==0 or Stopped on non-zero status / exception, raises OnHostStatusChanged with the device HostAddress as the host-name key. TransitionDeviceState guards against spurious same-state events under a per-device lock. ShutdownAsync cancels + disposes each probe's CTS + its captured runtime. DeviceState record gains ProbeLock / HostState / HostStateChangedUtc / ProbeCts / ProbeInitialized fields. IHostConnectivityProbe.GetHostStatuses returns one HostConnectivityStatus per device with the current state + last-change timestamp, surfaced to Admin /hosts per plan decision #144. IPerCallHostResolver.ResolveHost maps a tag full-reference to its DeviceHostAddress via the _tagsByName dict populated at Initialize time, which means UDT member full-references (Motor1.Speed synthesised by PR 6) resolve to the parent UDT's device without extra bookkeeping. Unknown references fall back to the first configured device's host address (invoker handles the actual mislookup at read time as BadNodeIdUnknown), and when no devices are configured resolver returns DriverInstanceId so the single-host fallback pipeline still works. Matches the plan decision #144 contract — Phase 6.1 resilience keys its bulkhead + breaker on (DriverInstanceId, ResolvedHostName) so a dead PLC trips only its own breaker, healthy siblings keep serving. 10 new unit tests in AbCipHostProbeTests covering GetHostStatuses returning one entry per device, probe success transitioning Unknown → Running, probe exception transitioning to Stopped, Enabled=false skipping the loop (no events + state stays Unknown), null ProbeTagPath skipping the loop, multi-device independent probe behavior (one Running + one Stopped simultaneously), ResolveHost for known tags returning the declared DeviceHostAddress, ResolveHost for unknown ref falling back to first device, ResolveHost falling back to DriverInstanceId when no devices, ResolveHost for UDT member walking to the synthesised member definition. Total AbCip unit tests now 147/147 passing (+10 from PR 7's 137). Full solution builds 0 errors; Modbus + other drivers untouched. ...

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-19 17:15:10 -04:00

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