connectionTransfer issue

For our interface with arduino device we found this “controlTrasfer” setting Int int int int byte int int UsbDeviceConnection.ControlTransfer( 0x21, 0x22, 0x00, 0, null, 0, 0);

But the first parameter “requestType” in java are “int” but in Xamarin are “USbAddressing” enumeration What is the value of 0x21 in Xamarin?

Thanks

Vincenzo