internal static extern int BtGattServerForeachServices(BluetoothGattServerHandle serverHandle, BtGattForeachCallback callback, IntPtr userData);
internal static extern int BtGattClientForeachServices(BluetoothGattClientHandle clientHandle, BtGattForeachCallback callback, IntPtr userData);
internal static extern int BtGattServiceForeachCharacteristics(BluetoothGattAttributeHandle serviceHandle, BtGattForeachCallback callback, IntPtr userData);
internal static extern int BtGattServiceForeachIncludedServices(BluetoothGattAttributeHandle serviceHandle, BtGattForeachCallback callback, IntPtr userData);
internal static extern int BtGattCharacteristicForeachDescriptors(BluetoothGattAttributeHandle characteristicHandle, BtGattForeachCallback callback, IntPtr userData);