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CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.1] - 2025-12-08
+
+### Changed
+- Moved configuration from hard-coded values to external `config.json` file
+- Configuration now loads from JSON file with graceful fallback to defaults
+- Config file is loaded relative to script location for portability
+
+### Added
+- `config.json` - External configuration file for all application settings
+- `load_config()` function with error handling and default value fallback
+- Warning messages when config file is missing or malformed
+
+## [0.1.0] - 2025-12-04
+
+### Added
+- Initial release of Series 4 Emitter
+- Micromate (Series 4) heartbeat monitoring for Seismo Fleet Manager
+- THORDATA folder scanner for MLG files
+- Automatic detection of newest MLG file per unit by timestamp
+- Age calculation and status classification (OK / LATE / STALE)
+- Console heartbeat display with formatted output
+- Optional HTTP POST to SFM backend endpoint
+- Configurable age thresholds and scan intervals
+- Debug logging capability
+- Graceful error handling for filesystem and network operations