Set Time Out duration for requested association for C-Echo / C-Store

[mohantyytasre]

Expected behavior

To allow the client to set the association requested time duration if association fails and to abort the association and client.

I am using C-Echo/C-store SCP program codes to test the Server with particular AET, IP address and Port #.
After providing wrong AET/IP address / Port # for server association request must get terminated after Association Request Timed Outset duration .

Actual behavior

I am not able to set the association requested time duration.
Please help me with this for implementation as I am still learning c# and so not able to get the syntax

Steps to reproduce the behavior

DicomCEchoRequest CEchoRequest = new DicomCEchoRequest();

        _echoServerHost = store_ServerHost;
        _echoServerPort = store_ServerPort;
        _echoServerAET = called_aet;
        _echoClientAET = calling_aet;

        var client = CreateDicomClient(store_ServerHost, store_ServerPort, calling_aet, called_aet);
        
        client.AssociationRequestTimedOut += (sender, e) =>
        {
            var t = e.TimeoutInMs;
           UpdateServerStatus("Association accepted by SCP");
        };

fo-dicom version and OS/platform

fo-dicom : 5.1.1
OS : Windows

[ChrisNewell-Inari]

In the API Documentation, the DicomClient constructonr lets you set the AssociationRequestTimeoutInMs via the DicomClientOptions hope this helps!

[mohantyytasre]

Thanks for reply....
I did used it and found that default Association Request Time Out duration is 5000 ms. I have added the Eventhandler with client as

        client.AssociationRequestTimedOut += (sender, e) =>
        {
            UpdateServerStatus($"Association requested for server time out: "+e.String());
        };

But even after no response from server after 5 sec. this event handler is not getting accessed by program. But also the system.exception error is getting logged as Exception thrown: 'System.Net.Sockets.SocketException' in System.dll.
So is it that where it is not allowing and exiting the current thread.
Also is there a way to cancel a request sent by client because in some discussions I have read that C-Cancel is not supported by fo-dicom.

[ChrisNewell-Inari]

Maybe A-Abort?

[gofal]

Take a look at this class: Tests/FO-DICOM.Tests/Network/Client/DicomClientTimeoutTests.cs
This are the unit tests about timeouts in clients. There you also find a method that tests the AssociationRequestTimeout:

fo-dicom/Tests/FO-DICOM.Tests/Network/Client/DicomClientTimeoutTests.cs

Line 620 in b45ffe1

public async Task AssociationRequestTimeOutExceptionShouldThrowAfterMaxRetry()

Basically, you have to wrap your await client.SendAsync() in a try-catch-block and catch the DicomAssociationRequestTimeOutException instead of only adding a handler to the event. You should catch all exceptions, also the SocketException.

You also can cancel requests. You can pass a CancellationToken as parameter to client.SendAsync(cancellationToken).