Added Bluetooth descriptors

Author: jeroen1602

CHANGELOG.md

@@ -3,6 +3,7 @@
 * Removed Flutter as a dependency
 * Added characteristic properties
 * Added toLowerCase to every call that requires a UUID, because the web api expects only lower case UUIDS.
+* Added Bluetooth descriptors.
 
 ## 0.0.1
 

lib/src/bluetooth_characteristic_properties.dart

@@ -12,7 +12,7 @@ class BluetoothCharacteristicProperties {
   @visibleForTesting
   BluetoothCharacteristicProperties(this._properties);
 
-  WebBluetoothCharacteristicProperties _properties;
+  final WebBluetoothCharacteristicProperties _properties;
 
   bool get broadcast => _properties.broadcast;
 

lib/src/bluetooth_descriptor.dart

@@ -0,0 +1,42 @@
+part of flutter_web_bluetooth;
+
+class BluetoothDescriptor {
+  @visibleForTesting
+  BluetoothDescriptor(this._descriptor);
+
+  final WebBluetoothRemoteGATTDescriptor _descriptor;
+
+  String get uuid => _descriptor.uuid;
+
+  ByteData? get value => _descriptor.value;
+
+  ///
+  /// May throw [NotSupportedError] if the operation is not allowed.
+  ///
+  Future<ByteData> readValue() async {
+    try {
+      return await _descriptor.readValue();
+    } catch (e) {
+      final error = e.toString().trim();
+      if (error.startsWith('NotSupportedError')) {
+        throw NotSupportedError(this.uuid);
+      }
+      throw e;
+    }
+  }
+
+  ///
+  /// May throw [NotSupportedError] if the operation is not allowed.
+  ///
+  Future<void> writeValue(Uint8List data) async {
+    try {
+      _descriptor.writeValue(data);
+    } catch (e) {
+      final error = e.toString().trim();
+      if (error.startsWith('NotSupportedError')) {
+        throw NotSupportedError(this.uuid);
+      }
+      throw e;
+    }
+  }
+}

lib/src/flutter_web_bluetooth_unsupported.dart

@@ -13,6 +13,8 @@ part 'bluetooth_characteristic_properties.dart';
 
 part 'bluetooth_default_uuids.dart';
 
+part 'bluetooth_descriptor.dart';
+
 part 'bluetooth_device.dart';
 
 part 'bluetooth_service.dart';

lib/src/flutter_web_bluetooth_web.dart

@@ -14,6 +14,8 @@ part 'bluetooth_characteristic_properties.dart';
 
 part 'bluetooth_default_uuids.dart';
 
+part 'bluetooth_descriptor.dart';
+
 part 'bluetooth_device.dart';
 
 part 'bluetooth_service.dart';