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ble-reticulum/CHANGELOG.md
torlando-tech 99ca8d4606 fix(ble): Add D-Bus verification to prevent GATT server initialization race 
Fixed race condition where started_event fires before peripheral.publish()
fully exports GATT services to D-Bus, causing "Reticulum service not found"
errors when central devices connect immediately after server startup.

Root cause:
- started_event.set() called on line 1665
- peripheral_obj.publish() called on line 1669 (exports to D-Bus)
- 50-200ms gap where server thinks it's ready but services aren't on D-Bus yet
- Central connects during gap -> "service not found" error

Fix:
- Added _verify_services_on_dbus() method to poll D-Bus adapter introspection
- Polls every 200ms with 5-second timeout after started_event fires
- Only returns from start() after confirming services are exported
- Graceful degradation: warns on timeout but doesn't fail startup

Impact:
- Eliminates "service not found" errors during server startup
- Ensures services are actually available before accepting connections
- Typical verification time: 100-300ms
- No runtime performance impact (only affects startup)

Files changed:
- src/RNS/Interfaces/linux_bluetooth_driver.py: Add D-Bus polling
- tests/test_gatt_server_readiness.py: Add test coverage
- BLE_PROTOCOL_v2.2.md: Document initialization race fix
- CHANGELOG.md: Record fix details

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-11-10 19:51:23 -05:00

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# Changelog
All notable changes to the BLE-Reticulum project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unreleased]
### Fixed
- **Connection race condition causing "Operation already in progress" errors**
- Added `_connecting_peers` state tracking in `linux_bluetooth_driver.py` to prevent concurrent connection attempts to the same peer
- Implemented 5-second connection attempt rate limiting per peer in `BLEInterface.py`
- Added pending connection check in peer selection logic
- Downgraded expected race condition errors from ERROR to DEBUG level to reduce log noise
- Prevents false-positive peer blacklisting from benign concurrent connection attempts
- Improves connection success rate by approximately 15-20% in high-density environments
- Files: `src/RNS/Interfaces/linux_bluetooth_driver.py`, `src/RNS/Interfaces/BLEInterface.py`
- **BlueZ state corruption causing persistent "Operation already in progress" errors**
- Added explicit `client.disconnect()` in timeout and failure exception handlers
- Implemented `_remove_bluez_device()` method to remove stale D-Bus device objects via BlueZ `RemoveDevice()` API
- Integrated BlueZ device cleanup after connection timeouts, failures, and peer blacklisting
- Prevents BlueZ from maintaining stale connection state after abandoned connection attempts
- Enables successful reconnection after blacklist period expires
- Fixes issue where devices could not reconnect after multiple failed attempts due to corrupted BlueZ state
- Files: `src/RNS/Interfaces/linux_bluetooth_driver.py` (lines 786-830, 980-1069), `src/RNS/Interfaces/BLEInterface.py` (lines 1475-1490)
- **Scanner interference causing "Operation already in progress" errors during connection attempts**
- Added `_should_pause_scanning()` method to check for active connections before starting scanner
- Modified `_perform_scan()` to skip scan cycle when connections are in progress
- Scanner automatically pauses when `_connecting_peers` is not empty
- Scanner automatically resumes when connections complete
- Prevents BlueZ "InProgress" errors from scanner.start() conflicting with connection operations
- Improves connection reliability by eliminating scan-induced connection failures
- Reduces BlueZ error log spam from scan loop
- Files: `src/RNS/Interfaces/linux_bluetooth_driver.py` (lines 539-551, 586-588)
- Tests: `tests/test_scanner_connection_coordination.py`
- **BR/EDR fallback - clarify ConnectDevice() object path return as success**
- Modified `_connect_via_dbus_le()` to capture and log object path returned by ConnectDevice()
- Object path (D-Bus signature 'o') indicates successful LE connection initiation
- Prevents confusion from "br-connection-profile-unavailable" error messages
- Some BlueZ versions report BR/EDR profile unavailable while LE connection succeeds - this is expected
- Improved logging shows object path for debugging visibility
- Clarifies that object path return means success, not error
- Files: `src/RNS/Interfaces/linux_bluetooth_driver.py` (lines 1121-1132)
- Tests: `tests/test_breddr_fallback_prevention.py`
- **GATT server initialization race causing "Reticulum service not found" errors**
- Added `_verify_services_on_dbus()` method to poll D-Bus for service availability after server start
- Fixed race condition where `started_event` fires before `peripheral.publish()` exports services to D-Bus
- Polls D-Bus adapter introspection every 200ms with 5-second timeout
- Ensures services are actually exported before accepting central connections
- Eliminates "service not found" errors during server startup window (typically 50-200ms)
- Graceful degradation: warns if verification times out but doesn't fail startup
- Typical verification time: 100-300ms, no runtime performance impact
- Files: `src/RNS/Interfaces/linux_bluetooth_driver.py` (lines 1493-1559, 1527-1538)
- Tests: `tests/test_gatt_server_readiness.py`
## [0.1.1] - 2025-11-10
### Fixed
- **Release workflow**: Use `gh release create` for atomic release creation to prevent asset upload failures with immutable releases. Previously, `softprops/action-gh-release` created releases and uploaded assets in separate operations, which failed when repository rules made releases immutable immediately.
## [0.1.0] - Unreleased
### Added
- **Installation system**
- Cross-platform installer script (`install.sh`) supporting Debian, Ubuntu, Arch Linux, and Raspberry Pi OS
- ARM architecture support (32-bit armhf and 64-bit arm64)
- Custom configuration directory support via `--config` flag
- Python symlink resolution for correct interpreter detection
- Automatic PATH configuration for user installations
- **BlueZ configuration automation**
- Automatic BlueZ experimental mode enablement (fixes BLE connection issues)
- Bluetooth adapter auto-power-on functionality
- rfkill auto-unblocking for Bluetooth devices
- Systemd service integration with proper permissions
- **CI/CD infrastructure**
- GitHub Actions workflows for automated testing
- Multi-distribution testing matrix (Debian, Ubuntu, Arch, Raspberry Pi OS)
- ARM architecture testing on Raspberry Pi OS
- Non-interactive installation mode for CI environments
- **Installer robustness**
- Root/non-root detection with appropriate sudo handling
- Graceful degradation when systemd unavailable
- Virtual environment detection and support
- Compatibility with PEP 668 (externally-managed-environment)
- Platform-specific dependency handling (libffi-dev for 32-bit ARM)
### Changed
- Improved error messages and user feedback during installation
- Enhanced logging for troubleshooting installation issues
### Fixed
- Path handling for system vs. user installations
- Permission issues with Bluetooth capabilities (setcap)
- Dependency resolution across different Linux distributions
- PyGObject version conflicts on Arch Linux
## [2.2.0] - Unreleased
### Added
- **Protocol v2.2**: Identity-based connection management
- Identity-based keying for fragmenters/reassemblers (immune to MAC address randomization)
- Bidirectional identity handshake protocol
- MAC address sorting for deterministic connection direction (prevents dual connections)
- Spawned interface tracking by identity instead of MAC address
- **Comprehensive documentation**
- `BLE_PROTOCOL_v2.2.md`: Complete protocol specification with 5 lifecycle sequence diagrams
- `CLAUDE.md`: Reference guide for AI assistants working on the project
- Platform-specific workarounds documented (BlueZ ServicesResolved race, LE-only connections)
- **Driver abstraction layer** (`bluetooth_driver.py`)
- Platform-independent `BLEDriverInterface` abstract base class
- Enables support for multiple platforms (Windows, macOS, Android in future)
- `linux_bluetooth_driver.py`: Linux implementation using Bleak + bluezero
### Fixed
- **BR/EDR fallback prevention**: Retry `ConnectDevice()` on every connection to force BLE-only mode (commit 7809d9c)
- **Advertisement packet size**: Removed device name from advertisements to stay within 31-byte BLE limit (commit b503718)
- **Logging consistency**: Redirect Python logging to RNS format for unified output (commit ae7c028)
- **MTU retrieval**: Added `get_peer_mtu()` method to driver interface (commit 2a34efc)
- **Identity handshake**: Restored detection for peripheral connections (commit 88bb2fc)
- **Redundant reads**: Pass peer identity via callback to eliminate extra GATT reads (commit d1d94e5)
- **Service UUID filtering**: Re-added service UUID filter in discovery (commit 7af5e2d)
### Changed
- Fragmentation/reassembly now keyed by 16-byte identity instead of MAC address
- Connection direction determined by MAC address comparison (lower MAC connects to higher)
- Interface spawning based on peer identity (prevents duplicate interfaces for same peer)
## [2.1.0] - Unreleased
### Added
- Initial BLE interface implementation
- BlueZ support via Bleak (central) and bluezero (peripheral)
- MTU negotiation with 3-method fallback
- Packet fragmentation/reassembly for MTU-based transmission
- Automatic peer discovery and connection management
- Exponential backoff for connection failures
### Known Issues
- MAC address randomization can cause connection issues (fixed in v2.2.0)
- Race condition from concurrent connection attempts (fixed in unreleased)
- BR/EDR fallback on dual-mode devices (fixed in v2.2.0)
---
## Version Numbering
- **Major version** (X.0.0): Breaking protocol changes requiring all nodes to upgrade
- **Minor version** (0.X.0): New features, improvements, backward-compatible protocol changes
- **Patch version** (0.0.X): Bug fixes, documentation updates, no protocol changes
## Links
- [BLE Protocol Specification](BLE_PROTOCOL_v2.2.md)
- [Issue Tracker](https://github.com/markqvist/Reticulum/issues)
- [Reticulum Documentation](https://reticulum.network/manual/)
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