KK

 BluetoothGattCharacteristic charGM =
                    mConnGatt.getService(UUID.fromString(BleUuid.SERVICE_GLUCOSE))
                        .getCharacteristic(UUID.fromString(BleUuid.CHAR_GLUCOSE_MEASUREMENT_STRING));
            mConnGatt.setCharacteristicNotification(charGM, enabled);
            BluetoothGattDescriptor descGM = charGM.getDescriptor(UUID.fromString(BleUuid.CHAR_CLIENT_CHARACTERISTIC_CONFIG_STRING));
            descGM.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mConnGatt.writeDescriptor(descGM);

            BluetoothGattCharacteristic charGMC =
                mConnGatt.getService(UUID.fromString(BleUuid.SERVICE_GLUCOSE))
                    .getCharacteristic(UUID.fromString(BleUuid.CHAR_GLUCOSE_MEASUREMENT_CONTEXT_STRING));
            mConnGatt.setCharacteristicNotification(charGMC, enabled);
            BluetoothGattDescriptor descGMC = charGMC.getDescriptor(UUID.fromString(BleUuid.CHAR_CLIENT_CHARACTERISTIC_CONFIG_STRING));
            descGMC.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mConnGatt.writeDescriptor(descGMC);

            BluetoothGattCharacteristic charRACP =
                mConnGatt.getService(UUID.fromString(BleUuid.SERVICE_GLUCOSE))
                    .getCharacteristic(UUID.fromString(BleUuid.CHAR_RECORD_ACCESS_CONTROL_POINT_STRING));
            mConnGatt.setCharacteristicNotification(charRACP, enabled);
            BluetoothGattDescriptor descRACP = charRACP.getDescriptor(UUID.fromString(BleUuid.CHAR_CLIENT_CHARACTERISTIC_CONFIG_STRING));
            descRACP.setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
            mConnGatt.writeDescriptor(descRACP);