bluetooth: Add control for reading/writing of descriptor values to internals page.

device/bluetooth/public/interfaces/device.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module bluetooth.mojom;
 
 import "device/bluetooth/public/interfaces/uuid.mojom";
 
 // Values representing the possible properties of a characteristic, which
 // define how the characteristic can be used. Each of these properties serve
@@ skipping 27 matching lines @@
   SUCCESS,
   UNKNOWN,
   FAILED,
   IN_PROGRESS,
   INVALID_LENGTH,
   NOT_PERMITTED,
   NOT_AUTHORIZED,
   NOT_PAIRED,
   NOT_SUPPORTED,
   SERVICE_NOT_FOUND,
-  CHARACTERISTIC_NOT_FOUND
+  CHARACTERISTIC_NOT_FOUND,
+  DESCRIPTOR_NOT_FOUND
 };
 
 // TODO(crbug.com/657632): Remove when numerical values can be optional.
 struct RSSIWrapper {
   int8 value;
 };
 
 struct DeviceInfo {
   string? name;
   string name_for_display;
@@ skipping 11 matching lines @@
 struct CharacteristicInfo {
   string id;
   UUID uuid;
   uint32 properties;
   array<uint8> last_known_value;
 };
 
 struct DescriptorInfo {
   string id;
   UUID uuid;
+  array<uint8> last_known_value;
 };
 
 interface Device {
   // Disconnects and deletes the Device.
   Disconnect();
 
   // Gets basic information about the device. Returns null, if no device is
   // available.
   GetInfo() => (DeviceInfo? info);
 
@@ skipping 17 matching lines @@
   WriteValueForCharacteristic(string service_id, string characteristic_id,
       array<uint8> value) => (GattResult result);
 
   // Gets the GATT Descriptors of the GATT Characteristic with matching
   // |characteristic_id| in the GATT Service with matching |service_id|.
   // If |descriptors| is null, an error occured while attempting to retrieve
   // the array of descriptors. If |descriptors| is empty, this simply
   // means that no descriptors were found.
   GetDescriptors(string service_id, string characteristic_id) =>
       (array<DescriptorInfo>? descriptors);
+
+  // Reads the value for the GATT Descriptor with |descriptor_id| in the GATT
+  // Characteristic with |characteristic_id| in the GATT Service with
+  // |service_id|.
+  ReadValueForDescriptor(string service_id, string characteristic_id,
+      string descriptor_id) => (GattResult result, array<uint8>? value);
+
+  // Writes the |value| for the GATT Descriptor with |descriptor_id| in the GATT
+  // Characteristic with |characteristic_id| in the GATT Service with
+  // |service_id|.
+  WriteValueForDescriptor(string service_id, string characteristic_id,
+      string descriptor_id, array<uint8> value) => (GattResult result);
 };