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feat(lmxproxy): replace subscribe/unsubscribe health probe with persistent subscription

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The old probe did a subscribe-read-unsubscribe cycle every 5 seconds to
check connection health. This created unnecessary churn and didn't detect
the failure mode where long-lived subscriptions silently stop receiving
COM callbacks (e.g. stalled STA message pump). The new approach keeps a
persistent subscription on the health check tag and forces reconnect if
no value update arrives within a configurable threshold (ProbeStaleThresholdMs,
default 5s). Also adds STA message pump debug logging (5-min heartbeat with
message counters) and fixes log file path resolution for Windows services.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
2026-03-24 11:57:22 -04:00
parent b3222cf30b
commit 95168253fc
12 changed files with 112 additions and 155 deletions
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4
lmxproxy/src/ZB.MOM.WW.LmxProxy.Host/LmxProxyService.cs
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@@ -68,9 +68,7 @@ namespace ZB.MOM.WW.LmxProxy.Host
nodeName: _config.Connection.NodeName,
galaxyName: _config.Connection.GalaxyName,
probeTestTagAddress: _config.HealthCheck.TestTagAddress,
probeTimeoutMs: _config.HealthCheck.ProbeTimeoutMs,
maxConsecutiveTransportFailures: _config.HealthCheck.MaxConsecutiveTransportFailures,
degradedProbeIntervalMs: _config.HealthCheck.DegradedProbeIntervalMs,
probeStaleThresholdMs: _config.HealthCheck.ProbeStaleThresholdMs,
clientName: _config.ClientName);
// 5. Connect to MxAccess synchronously (with timeout)