#161 Add DataConvertible conformance to GATTNumberOfDigitals

Sources/BluetoothGATT/GATTNumberOfDigitals.swift

@@ -6,59 +6,56 @@
 //  Copyright © 2018 PureSwift. All rights reserved.
 //
 
-import Foundation
+import Bluetooth
 
-// MARK: - Number of Digitals
 /// GATT Number of Digitals Descriptor
 ///
 /// The Characteristic Number of Digitals descriptor is used for defining the number of digitals in a characteristic.
 @frozen
-public struct GATTNumberOfDigitals: GATTDescriptor, RawRepresentable, Equatable, Hashable {
-
-    public static let uuid: BluetoothUUID = .numberOfDigitals
-
-    public static let length = 1
+public struct GATTNumberOfDigitals: GATTDescriptor, RawRepresentable, Equatable, Hashable, Sendable {
 
+    public static var uuid: BluetoothUUID { .numberOfDigitals }
+
     public var rawValue: UInt8
 
     public init(rawValue: UInt8) {
-
         self.rawValue = rawValue
     }
+}
+
+// MARK: - DataConvertible
+
+extension GATTNumberOfDigitals: DataConvertible {
 
-    public init?(data: Data) {
-
-        guard data.count == type(of: self).length
+    public static var length: Int { 1 }
+
+    public init?<Data: DataContainer>(data: Data) {
+        guard data.count == Self.length
             else { return nil }
-
-        rawValue = data[0]
+        self.init(rawValue: data[0])
     }
 
-    public var data: Data {
-
-        return Data([rawValue])
+    public func append<Data>(to data: inout Data) where Data : DataContainer {
+        data += rawValue
     }
 
-    public var descriptor: GATTAttribute.Descriptor {
-
-        return GATTAttribute.Descriptor(uuid: type(of: self).uuid,
-                               value: data,
-                               permissions: [.read])
-    }
+    public var dataLength: Int { Self.length }
 }
 
+// MARK: - CustomStringConvertible
+
 extension GATTNumberOfDigitals: CustomStringConvertible {
 
     public var description: String {
-
         return rawValue.description
     }
 }
 
+// MARK: - ExpressibleByIntegerLiteral
+
 extension GATTNumberOfDigitals: ExpressibleByIntegerLiteral {
 
     public init(integerLiteral value: UInt8) {
-
         self.init(rawValue: value)
     }
 }