bluetooth: mac: write characteristic implementation

device/bluetooth/bluetooth_remote_gatt_service_mac.h

Index: device/bluetooth/bluetooth_remote_gatt_service_mac.h
diff --git a/device/bluetooth/bluetooth_remote_gatt_service_mac.h b/device/bluetooth/bluetooth_remote_gatt_service_mac.h
index cec954745a01aa7ffd90dc04b27a267dfa73e4b1..8b0bd0ea895706c1dea0c5fa5c2173a09da97c4c 100644
--- a/device/bluetooth/bluetooth_remote_gatt_service_mac.h
+++ b/device/bluetooth/bluetooth_remote_gatt_service_mac.h
@@ -54,9 +54,12 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothRemoteGattServiceMac
   // Called by the BluetoothLowEnergyDeviceMac instance when the characteristics
   // has been discovered.
   void DidDiscoverCharacteristics();
-  // Called by the BluetoothRemoteGattServiceMac instance when the
+  // Called by the BluetoothLowEnergyDeviceMac instance when the
   // characteristics value has been read.
   void DidUpdateValue(CBCharacteristic* characteristic, NSError* error);
+  // Called by the BluetoothLowEnergyDeviceMac instance when the
+  // characteristics value has been written.
+  void DidWriteValue(CBCharacteristic* characteristic, NSError* error);
   // Returns true if the characteristics has been discovered.
   bool IsDiscoveryComplete();