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>
Multiple instances registering with the same name may cause MxAccess to
conflict on callback routing. ClientName is now configurable via
appsettings.json, defaulting to a GUID-suffixed name if not set.
Instances A and B use "LmxProxy-A" and "LmxProxy-B" respectively.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Replaced STA dispatch thread with Task.Run pattern for COM interop
- Fixed TypedValue oneof tracking with property-level _setCase field
- Added x-api-key DelegatingHandler for gRPC metadata authentication
- Fixed CheckApiKey RPC to validate request body key (not header)
- Integration tests: 15/17 pass (reads, subscribes, API keys, connections)
- 2 write tests pending (OnWriteComplete callback timing issue)
- v2 service deployed on windev port 50100
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
