avra-cadavra/device-discovery-service

Device Discovery Service

Core Purpose

Discover nearby SPOTS-enabled devices for AI2AI connections.

Platform Support

• Android: BLE + WiFi Direct
• iOS: Multipeer Connectivity + mDNS
• Web: WebRTC + WebSocket

Discovery Pattern

/// Device Discovery Service
/// 
/// Discovers nearby SPOTS-enabled devices
class DeviceDiscoveryService {
  final BLEScanner _bleScanner;
  final WiFiDirectScanner? _wifiScanner;
  
  /// Start continuous device discovery
  Future<void> startDiscovery({
    Duration scanInterval = const Duration(seconds: 5),
    Duration scanWindow = const Duration(seconds: 4),
    Duration deviceTimeout = const Duration(minutes: 2),
  }) async {
    // Start continuous scanning
    await _bleScanner.startScan(
      serviceUuid: spotsServiceUuid,
      scanInterval: scanInterval,
      scanWindow: scanWindow,
    );
    
    // Optional: WiFi Direct for Android
    if (_wifiScanner != null) {
      await _wifiScanner.startScan();
    }
  }
  
  /// Stop device discovery
  Future<void> stopDiscovery() async {
    await _bleScanner.stopScan();
    await _wifiScanner?.stopScan();
  }
  
  /// Get discovered devices
  Stream<List<DiscoveredDevice>> get discoveredDevices => _deviceStream;
}

Service UUID Filtering

/// SPOTS Service UUID for hardware-level filtering
static const String spotsServiceUuid = '0000ff00-0000-1000-8000-00805f9b34fb';

/// Start scanning with service UUID filter (power efficient)
await ble.scan(
  withServices: [Guid(spotsServiceUuid)],
  scanMode: ScanMode.lowPower,
);

Personality Data Extraction

/// Extract personality data from device advertisement
Future<AnonymizedPersonalityData?> extractPersonalityData(
  DiscoveredDevice device,
) async {
  // Extract anonymized personality data from advertisement
  // No personal identifiers, only anonymized personality dimensions
  final advertisementData = device.advertisementData;
  return AnonymizedPersonalityData.fromAdvertisement(advertisementData);
}

Platform-Specific Implementations

Android

/// Android BLE Device Discovery
class BLEDeviceDiscoveryAndroid implements DeviceDiscovery {
  @override
  Future<void> startDiscovery() async {
    // Use Android BLE APIs
    // Foreground service for background scanning
  }
}

iOS

/// iOS Multipeer Connectivity Discovery
class DeviceDiscoveryIOS implements DeviceDiscovery {
  @override
  Future<void> startDiscovery() async {
    // Use Multipeer Connectivity framework
    // Background modes for continuous operation
  }
}

Reference

• docs/ai2ai/06_network_connectivity/DEVICE_DISCOVERY.md
• lib/core/network/device_discovery_android.dart
• lib/core/network/device_discovery_ios.dart