T_O_IOData always zero

[arkypita]

Hello,
I have successfully managed to set up an Ethernet IP connection, read explicit data via GetAttributeSingle, and activate an implicit message session via ForwardOpen.

All the data I set using O_T_IOData correctly goes to the device, but all the data the device send to me are not available inside the array T_O_IOData
The content of the array T_O_IOData is always zero, although through WireShark I can correctly see the data that the device is sending me.
Tested with latest dll both from sourceforge and via nuget package, same behaviour.
What am I doing wrong?

Thanks for any help

Attached screenshot form wireshark/my application and source code.

using Sres.Net.EEIP;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EthernetIP
{
    class Program
    {
        static void Main(string[] args)
        {
			EEIPClient EEIP = new EEIPClient();

			EEIP.RegisterSession("192.168.168.44");

			// explicit/aciclic read
			byte[] digitalInputs = EEIP.GetAttributeSingle(102 , 1 , 113);
			Console.WriteLine("Drive temperature: " + (EEIPClient.ToUshort(digitalInputs)) / 10.0 + "°C");


			// implicit/cyclic read

			//Parameters from Originator -> Target (da me a lui)
			EEIP.O_T_InstanceID = 120;              //Instance ID of the Output Assembly
			EEIP.O_T_Length = 56;                     //The Method "Detect_O_T_Length" detect the Length using an UCMM Message
			EEIP.O_T_RealTimeFormat = Sres.Net.EEIP.RealTimeFormat.Header32Bit;   //Header Format
			EEIP.O_T_OwnerRedundant = false;
			EEIP.O_T_Priority = Sres.Net.EEIP.Priority.Scheduled;
			EEIP.O_T_VariableLength = false;
			EEIP.O_T_ConnectionType = Sres.Net.EEIP.ConnectionType.Point_to_Point;
			EEIP.RequestedPacketRate_O_T = 500000;        //500ms is the Standard value

			//Parameters from Target -> Originator (da lui a me)
			EEIP.T_O_InstanceID = 121;
			EEIP.T_O_Length = 56;
			EEIP.T_O_RealTimeFormat = Sres.Net.EEIP.RealTimeFormat.Modeless;
			EEIP.T_O_OwnerRedundant = false;
			EEIP.T_O_Priority = Sres.Net.EEIP.Priority.Scheduled;
			EEIP.T_O_VariableLength = false;
			EEIP.T_O_ConnectionType = Sres.Net.EEIP.ConnectionType.Point_to_Point;
			EEIP.RequestedPacketRate_T_O = 500000;    //RPI in  500ms is the Standard value

			EEIP.O_T_IOData[0] = 0x08;

			//Forward open initiates the Implicit Messaging
			EEIP.ForwardOpen();

			EEIP.O_T_IOData[0] = 0x08;

			while (!Console.KeyAvailable)
			{
				//Read the Inputs Transfered form Target -> Originator
				Console.WriteLine("EEIP.T_O_IOData: " + BitConverter.ToString(EEIP.T_O_IOData).Replace("-", ""));

				System.Threading.Thread.Sleep(1000);
			}

			//Close the Session
			EEIP.ForwardClose();
			//When done, we unregister the session
			EEIP.UnRegisterSession();
		}
    }
}