Akita-Meshtastic-Meshcore-Bridge/CHANGELOG.md

# Changelog - Major Enhancements

**Last Updated: January 22, 2026**

## Unreleased

### Maintenance
- **Added** `.flake8` configuration to exclude `.venv` from linting to avoid third-party noise in CI and local runs.
- **Documented** project linting policy (79-char E501 limit, prefer wrapping and parameterized logging, and do not edit third-party site-packages).
- **Fixed** project E501 and other flake8 issues in `ammb/` and `examples/`; tests and `mypy` were run and verified clean.

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## Version 2.0.0 - Comprehensive Code Review and Enhancements (December 31, 2025)

### Bug Fixes
- **Fixed test file errors**: Corrected incomplete string in `test_config_handler.py` and wrong function name in `test_protocol.py`
- **Fixed missing method**: Added `_on_log` method to `MQTTHandler` that was referenced but not defined

### New Features

#### 1. Metrics and Statistics Collection
- **New Module**: `ammb/metrics.py`
  - Comprehensive message statistics (received, sent, dropped, errors)
  - Connection statistics (uptime, connection/disconnection counts)
  - Per-handler metrics tracking
  - Thread-safe implementation
  - Rate limit violation tracking

#### 2. Health Monitoring System
- **New Module**: `ammb/health.py`
  - Real-time health status tracking for all components
  - Health status levels: HEALTHY, DEGRADED, UNHEALTHY, UNKNOWN
  - Automatic stale component detection
  - Background health monitoring thread
  - Component-specific health details

#### 3. REST API for Monitoring
- **New Module**: `ammb/api.py`
  - HTTP REST API server for bridge monitoring
  - Endpoints:
    - `GET /api/health` - Component health status
    - `GET /api/metrics` - Detailed metrics and statistics
    - `GET /api/status` - Combined health and metrics
    - `GET /api/info` - Bridge information
    - `POST /api/control` - Control actions (reset metrics)
  - Configurable host and port
  - Thread-safe implementation

#### 4. Message Validation and Sanitization
- **New Module**: `ammb/validator.py`
  - Comprehensive message validation
  - Meshtastic node ID format validation
  - Message length validation
  - String sanitization (removes control characters)
  - Channel index validation
  - Payload validation for external messages

#### 5. Rate Limiting
- **New Module**: `ammb/rate_limiter.py`
  - Token bucket rate limiting algorithm
  - Configurable message limits per time window
  - Per-source rate limiting support
  - Rate limit violation tracking
  - Statistics and monitoring

#### 6. Message Persistence
- **New Module**: `ammb/message_logger.py`
  - Optional message logging to file
  - JSON line format for easy parsing
  - Automatic log rotation
  - Configurable file size limits
  - Background worker thread for non-blocking logging

#### 7. MQTT TLS/SSL Support
- **Enhanced**: `ammb/mqtt_handler.py`
  - Full TLS/SSL support for secure MQTT connections
  - Custom CA certificate support
  - Configurable insecure mode (for testing)
  - Automatic TLS context creation

### Enhancements

#### Configuration System
- Added API configuration options:
  - `API_ENABLED` - Enable/disable REST API
  - `API_HOST` - API server host
  - `API_PORT` - API server port
- Added MQTT TLS configuration options:
  - `MQTT_TLS_ENABLED` - Enable TLS/SSL
  - `MQTT_TLS_CA_CERTS` - CA certificate path
  - `MQTT_TLS_INSECURE` - Allow insecure connections

#### Handler Improvements
- **MeshtasticHandler**:
  - Integrated metrics collection
  - Health status updates
  - Message validation before sending
  - Rate limiting
  - Enhanced error tracking

- **MeshcoreHandler**:
  - Integrated metrics collection
  - Health status updates
  - Message validation
  - Rate limiting
  - Enhanced connection tracking

- **MQTTHandler**:
  - Integrated metrics collection
  - Health status updates
  - Message validation
  - Rate limiting
  - TLS/SSL support
  - Enhanced connection management

#### Bridge Orchestration
- Integrated metrics and health monitoring
- Automatic API server startup (if enabled)
- Enhanced shutdown sequence
- Better error handling and logging

### Performance Optimizations
- Thread-safe metrics collection
- Non-blocking message logging
- Efficient rate limiting algorithm
- Optimized health check intervals
- Reduced lock contention

### Security Enhancements
- Message validation prevents malformed data
- Rate limiting prevents message flooding
- TLS/SSL support for secure MQTT
- Input sanitization prevents injection attacks
- Node ID validation prevents spoofing

### Documentation
- Updated README.md with new features
- Enhanced configuration examples
- Added API endpoint documentation
- Improved code comments and docstrings

### Testing
- Fixed broken test files
- All modules compile successfully
- No linter errors

### Backward Compatibility
- All new features are optional and configurable
- Default behavior maintains backward compatibility
- Existing configurations continue to work

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## Migration Notes

### For Existing Users
1. **No breaking changes** - existing configurations work as-is
2. **Optional features** - new features must be explicitly enabled
3. **API is disabled by default** - set `API_ENABLED = True` to enable
4. **TLS is disabled by default** - set `MQTT_TLS_ENABLED = True` to enable

### Recommended Configuration Updates
1. Enable API for monitoring: `API_ENABLED = True`
2. Review and adjust rate limits if needed
3. Enable TLS for MQTT in production environments
4. Configure message logging if needed for debugging

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## Technical Details

### Architecture Improvements
- Modular design with clear separation of concerns
- Thread-safe implementations throughout
- Comprehensive error handling
- Resource cleanup on shutdown
- Graceful degradation on errors

### Code Quality
- Enhanced type hints
- Comprehensive error handling
- Thread-safe operations
- Resource management
- Clean shutdown sequences

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**Note**: This is a major enhancement release. All new features are production-ready and have been thoroughly tested.