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Pitfall Log: Fixing Modbus Multithread Deadlocks
A field note on shutdown deadlocks and timeout misjudgment in a Qt multithreaded Modbus workflow, with practical fixes.
Blog
Rootless Container Inbound Source IP Preservation: Hybrid Host-Bridge Topology and Tradeoff Analysis
Architecture analysis and implementation of inbound source IP preservation under Rootless Podman. Uses a Hybrid Host-Bridge topology to retain real client IPs at edge services while preserving network isolation for internal services, with tradeoff analysis, implementation details, and verification methodology.
Troubleshooting H.265 HTTP-FLV Browser Streaming on an IIoT Platform
This post documents an H.265 HTTP-FLV browser streaming issue on an IIoT platform, from playback URL validation and desktop player compatibility checks to local FLV baseline verification and correlating fetchError, WinError 10053, and a frontend TypeError into a reusable debugging SOP.
IIoT Ingress Postmortem: Troubleshooting EMQX 5.8 Under Podman Rootless
A postmortem of an IIoT ingress deployment failure: under Podman Rootless, EMQX 5.8 exposed unstable Erlang IPC, HOCON schema validation failures, a blocked security-group port, and M2M requests rejected by CSRF middleware. This post covers the confirmed causes, fixes, and validation path.
TrafficMonitor CPU Optimization Postmortem: An Engineering Simplification from 4% to 0.6%
A postmortem on CPU optimization under a high-frequency polling workload: by shrinking the UI logging path, removing high-frequency state machines, and fixing the wait model, CPU usage dropped from 3.6%~4.2% to 0.1%~0.6%.
Rootless Podman + Systemd Supervision Failure Postmortem: Diagnosing and Repairing a Broken Recovery Path
A postmortem on a failed recovery path under Rootless Podman + Systemd user units, covering confirmed contributing factors, concrete remediation work, validation steps, and remaining risks.
JWT Dual-Token Hardening Postmortem: From Stateless Refresh to Revocable Redis Sessions
A security hardening postmortem for JWT AT/RT architecture: treating Redis reservation as completed and implementing RT rotation, replay detection, and revocable sessions.
HTTPS Upgrade Triggered 403: A Deep Postmortem from Security Middleware to Container Isolation
A postmortem on a persistent 403 after HTTPS migration, traced to both missing CSRF allowlist updates and Podman Rootless image namespace isolation.
Modbus-Tools Deep Dive: A Practical Modbus Workflow for Daily Debugging
A practical guide to a lightweight Modbus tool for embedded development and field commissioning: fast frame building, log viewing, Frame Analyzer with scaling/register annotations/JSON-CSV persistence, Link to Analyzer live linkage, and Force Parse.
Hello World
fmt.Println(“Hello, Intent”)