How to send data to HID device in Unity Input System

Question

I managed to implement the HID device in Unity Input System and I can read from it easily. But how to send data back to the HID device?

This is the IInputDeviceCommandInfo implementation I have:

    [StructLayout(LayoutKind.Explicit)]
    internal struct MyControlCommand : IInputDeviceCommandInfo
    {
        public static FourCC Type { get { return new FourCC("HIDO"); } }
  
        [FieldOffset(0)]
        public byte res;

        [FieldOffset(1)]
        public byte magic; 

        [FieldOffset(2)]
        public byte DataType;

        [FieldOffset(3)]
        public short Data;
 
        public FourCC typeStatic
        {
            get { return Type; }
        }

        public static MyControlCommand Create(byte dataType, short data)
        {
            return new MyControlCommand
            { 
                magic = 0x7e,
                DataType = dataType,
                Data = data
            };
        }
    }

I wanted to send these bytes:

0
0x7e
0x04
0xfff

So I used:

var c = MyControlCommand.Create(0x04, 0xfff);
var res = current.ExecuteCommand(ref c);

The res variable gets -1, so It's unsuccessful.

I managed to communicate with the device (above bytes worked fine) using HidSharp library and my own HID implementation, but Unity is stubborn...

Thanks for help!