acidburns 32cd0652c9 Improve reliability and add data recovery tools ...

## Bug Fixes
- Fix integer overflow potential in history bin allocation (web_server.cpp)
  Using uint64_t for intermediate multiplication prevents overflow with different constants

- Prevent data loss during WiFi failures (main.cpp)
  Device now automatically attempts WiFi reconnection every 30 seconds when in AP mode
  Exits AP mode and resumes MQTT transmission as soon as WiFi becomes available
  Data collection and SD logging continue regardless of connectivity

## New Features
- Add standalone MQTT data republisher for lost data recovery
  - Command-line tool (republish_mqtt.py) with interactive and scripting modes
  - GUI tool (republish_mqtt_gui.py) for user-friendly recovery
  - Rate-limited publishing (5 msg/sec default, configurable 1-100)
  - Manual time range selection or auto-detect missing data via InfluxDB
  - Cross-platform support (Windows, macOS, Linux)
  - Converts SD card CSV exports back to MQTT format

## Documentation
- Add comprehensive code review (CODE_REVIEW.md)
  - 16 detailed security and quality assessments
  - Identifies critical HTTPS/auth gaps, medium-priority overflow issues
  - Confirms absence of buffer overflows and unsafe string functions
  - Grade: B+ with areas for improvement

- Add republisher documentation (REPUBLISH_README.md, REPUBLISH_GUI_README.md)
  - Installation and usage instructions
  - Example commands and scenarios
  - Troubleshooting guide
  - Performance characteristics

## Dependencies
- Add requirements_republish.txt
  - paho-mqtt>=1.6.1
  - influxdb-client>=1.18.0

## Impact
- Eliminates data loss scenario where unreliable WiFi leaves device stuck in AP mode
- Provides recovery mechanism for any historical data missed during outages
- Improves code safety with explicit overflow-resistant arithmetic
- Increases operational visibility with comprehensive code review

2026-03-11 17:01:22 +01:00

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