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Add streams for getting updates #86

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Add streams for getting updates #86

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8 changes: 7 additions & 1 deletion lib/src/universal_ble.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -70,9 +70,15 @@ class UniversalBle {
}

/// Connection stream of a device
Stream<bool> connectionStream(String deviceId) =>
static Stream<BleDevice> get scanStream => _platform.scanStream();

static Stream<bool> connectionStream(String deviceId) =>
_platform.connectionStream(deviceId);

static Stream<Uint8List> characteristicStream(
String deviceId, String characteristicId) =>
_platform.characteristicStream(deviceId, characteristicId);

/// Connect to a device.
/// It is advised to stop scanning before connecting.
/// It might throw errors if device is not connectable.
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115 changes: 82 additions & 33 deletions lib/src/universal_ble_platform_interface.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,21 @@ import 'dart:typed_data';
import 'package:universal_ble/universal_ble.dart';

abstract class UniversalBlePlatform {
StreamController? _connectionStreamController;
StreamController<BleDevice>? _scanStreamController;
StreamController<({String deviceId, bool isConnected})>?
_connectionStreamController;
StreamController<
({String deviceId, String characteristicId, Uint8List value})>?
_characteristicStreamController;

final Map<String, bool> _pairStateMap = {};

OnScanResult? onScanResult;
OnConnectionChange? onConnectionChange;
OnValueChange? onValueChange;
OnAvailabilityChange? onAvailabilityChange;
OnPairingStateChange? onPairingStateChange;

Future<AvailabilityState> getBluetoothAvailabilityState();

Future<bool> enableBluetooth();
Expand Down Expand Up @@ -51,33 +63,49 @@ abstract class UniversalBlePlatform {

Future<BleConnectionState> getConnectionState(String deviceId);

Future<List<BleDevice>> getSystemDevices(
List<String>? withServices,
);
Future<List<BleDevice>> getSystemDevices(List<String>? withServices);

bool receivesAdvertisements(String deviceId) => true;

Stream<bool> connectionStream(String deviceId) {
_setupConnectionStreamIfRequired();
return _connectionStreamController!.stream
.where((event) => event.deviceId == deviceId)
.map((event) => event.isConnected);
}
Stream<BleDevice> scanStream() => _getScanStreamController().stream;

Stream<bool> connectionStream(String deviceId) =>
_getConnectionStreamController()
.stream
.where((event) => event.deviceId == deviceId)
.map((event) => event.isConnected);

Stream<Uint8List> characteristicStream(
String deviceId, String characteristicId) =>
_getCharacteristicStreamController()
.stream
.where((event) =>
event.deviceId == deviceId &&
event.characteristicId == characteristicId)
.map((event) => event.value);

void updateScanResult(BleDevice bleDevice) {
onScanResult?.call(bleDevice);
_scanStreamController?.add(bleDevice);
}

void updateConnection(String deviceId, bool isConnected) {
onConnectionChange?.call(deviceId, isConnected);
_connectionStreamController
?.add((deviceId: deviceId, isConnected: isConnected));
_connectionStreamController?.add((
deviceId: deviceId,
isConnected: isConnected,
));
}

void updateCharacteristicValue(
String deviceId, String characteristicId, Uint8List value) {
onValueChange?.call(
deviceId, BleUuidParser.string(characteristicId), value);
_characteristicStreamController?.add((
deviceId: deviceId,
characteristicId: BleUuidParser.string(characteristicId),
value: value,
));
}

void updateAvailability(AvailabilityState state) {
Expand All @@ -90,31 +118,52 @@ abstract class UniversalBlePlatform {
onPairingStateChange?.call(deviceId, isPaired);
}

// Do not use these directly to push updates
OnScanResult? onScanResult;
OnConnectionChange? onConnectionChange;
OnValueChange? onValueChange;
OnAvailabilityChange? onAvailabilityChange;
OnPairingStateChange? onPairingStateChange;

static void logInfo(String message, {bool isError = false}) {
if (isError) message = '\x1B[31m$message\x1B[31m';
log(message, name: 'UniversalBle');
/// Setup autoDisposable StreamControllers
StreamController<({String deviceId, bool isConnected})>
_getConnectionStreamController() {
if (_connectionStreamController != null) {
_connectionStreamController =
StreamController<({String deviceId, bool isConnected})>.broadcast();
_connectionStreamController?.onCancel = () {
_connectionStreamController?.close();
_connectionStreamController = null;
};
}
return _connectionStreamController!;
}

/// Creates an auto disposable streamController
void _setupConnectionStreamIfRequired() {
if (_connectionStreamController != null) return;
StreamController<
({String deviceId, String characteristicId, Uint8List value})>
_getCharacteristicStreamController() {
if (_characteristicStreamController == null) {
_characteristicStreamController = StreamController<
({
String deviceId,
String characteristicId,
Uint8List value
})>.broadcast();
_characteristicStreamController?.onCancel = () {
_characteristicStreamController?.close();
_characteristicStreamController = null;
};
}
return _characteristicStreamController!;
}

_connectionStreamController =
StreamController<({String deviceId, bool isConnected})>.broadcast();
StreamController<BleDevice> _getScanStreamController() {
if (_scanStreamController == null) {
_scanStreamController = StreamController<BleDevice>.broadcast();
_scanStreamController?.onCancel = () {
_scanStreamController?.close();
_scanStreamController = null;
};
}
return _scanStreamController!;
}

// Auto dispose if no more subscribers
_connectionStreamController?.onCancel = () {
// logInfo('Disposing Connection Stream');
_connectionStreamController?.close();
_connectionStreamController = null;
};
static void logInfo(String message, {bool isError = false}) {
if (isError) message = '\x1B[31m$message\x1B[31m';
log(message, name: 'UniversalBle');
}
}

Expand Down
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