Initial Release #

First public release of the SoCo Dart port. This is a complete port of the Python SoCo library, providing programmatic control of Sonos speakers from Dart applications.

Added #

Core Features

• SoCo class with 120+ methods for comprehensive speaker control
• Device discovery via SSDP multicast and network scanning
• Playback control: play, pause, stop, next, previous, seek, play from queue
• Volume & audio: volume, mute, bass, treble, loudness, balance
• Queue management: get, add, remove, clear, reorder queue items
• Group management: join, unjoin, party mode, zone groups
• Music library: browse and search local music library
• Alarms: full CRUD operations for Sonos alarms
• Snapshot/restore: save and restore speaker state
• Events: UPnP subscriptions with Dart Streams
• Sleep timer and battery info support

Advanced Features

• Home theater: night mode, dialog mode, audio delay
• Surround speakers: enable/disable, volume control
• Subwoofer: enable/disable, gain, crossover settings
• Stereo pairs: create and separate stereo pairs
• Trueplay and fixed volume support
• Line-in and TV input switching

Music Services

• Music service accounts management
• Token store for service authentication
• Service-specific data structures
• Music service browsing and playback

Plugins

• Plugin system base infrastructure
• ShareLink plugin: Share music links across services
• Plex plugin: Plex media server integration
• Example plugin template

Data Structures

• DIDL-Lite metadata classes (tracks, albums, artists, playlists)
• Search results with pagination
• Zone group and zone member structures
• Alarm and snapshot data models

Project Statistics #

• 18 core modules fully ported
• 5 music service modules
• 4 plugin modules
• 21 test modules with 567+ unit tests
• 80% code coverage (1843/2304 lines)
• 7 comprehensive examples
• Zero analyzer warnings

Differences from Python SoCo #

• All I/O operations are async (Future-based)
• Events use Dart Streams instead of callbacks
• Full null-safety support
• Dart naming conventions (camelCase)
• Immutable data structures where appropriate

Fixed #

• UPnP Service Control URLs: Fixed incorrect control URLs that caused HTTP 405 errors when communicating with real Sonos hardware. Services now use correct paths:

  • RenderingControl: /MediaRenderer/RenderingControl/Control
  • AVTransport: /MediaRenderer/AVTransport/Control
  • ContentDirectory: /MediaServer/ContentDirectory/Control
  • And other services with appropriate prefixes

• getSpeakerInfo Caching: Fixed issue where getSpeakerInfo() would return incomplete data after device discovery. The method now correctly fetches speaker info even when ZoneGroupState data is already present.

Added #

• Integration Test Suite: Added comprehensive integration test (test_integration.dart) that validates all core functionality against real Sonos hardware:
  • Discovery (11 devices found)
  • Volume and mute controls
  • Transport state and track info
  • Speaker info (zone name, model, versions)
  • Group operations (coordinator, members, all groups)
  • Play mode (shuffle, repeat)
  • Audio settings (bass, treble, loudness)
  • Sleep timer and available actions
  • TV/Line-in/Radio detection
  • Music library browsing
  • Zone enumeration (all zones, visible zones)

Changed #

• Updated services.dart with proper eventSubscriptionUrl and defaultArgs for all UPnP services to match Python SoCo implementation

Performance Improvements #

• XML Serialization Optimizations: Significant performance improvements for DIDL-Lite XML operations:

  • Direct XML builder usage (toElementInBuilder) avoids intermediate object creation
  • Pre-computed namespace tags for common DIDL elements (dc:title, upnp:class, etc.)
  • Optimized child element lookup using pre-built maps instead of repeated tree traversal
  • Pre-computed translation lookup keys for faster metadata extraction
  • Conditional logging to eliminate overhead when logging is disabled
  • Cache key optimization using hash codes instead of full strings

• Performance Benchmarks: Added comprehensive benchmark suite (benchmark/benchmark.dart) comparing Dart vs Python SoCo:

  • DIDL to String: 50% faster (~30K ops/sec vs ~20K ops/sec baseline)
  • Round-trip (parse → serialize): 84% faster (~83K ops/sec vs ~45K ops/sec baseline)
  • fromElement: Maintained high performance (~151K ops/sec)
  • Round-trip operations now 2x faster than Python SoCo

Added #

• Performance Benchmark Suite: Added benchmark/benchmark.dart and benchmark/benchmark_python.py for performance comparison
• Performance Documentation: Added benchmark/PERFORMANCE_COMPARISON.md and benchmark/OPTIMIZATION_NOTES.md documenting optimizations

Changed #

• DidlResource.toElementInBuilder(): New optimized method for direct XML building
• DidlObject.toElement(): Now uses optimized boolean string conversion
• fromDidlString(): Improved error recovery using pre-compiled RegExp
• Metadata extraction: Uses pre-computed lookup keys for faster access

Technical Details #

• XML serialization now uses direct builder methods instead of parse/serialize cycles
• Child element collection optimized to single pass with map-based lookups
• Namespace tag generation uses pre-computed constants for common cases
• Translation lookup keys pre-computed at class initialization