[Fwd: RE: [Fwd: [IGSTK-Users] Connection lost using igstk:SocketCommunication]]

[Patrick Cheng]

-------- Original Message --------
Subject: RE: [Fwd: [IGSTK-Users] Connection lost using 
igstk:SocketCommunication]
Date: Wed, 11 Jul 2007 10:15:38 -0700
From: Hui Zhang <hzhang at accuray.com>
To: Patrick Cheng <cheng at isis.georgetown.edu>
CC: <vgratsac at irisa.fr>

Hi, Patrick,

Everything is great here, but recently is pretty busy with product release.

As to the socket communication time out problem, from the description, I 
guess it is due to that the server shuts down the communication for some 
reason after establishing the connection. We use the socket 
communication class in the deck of cards robot and it works well.

To keep sending some packets may help the connection in this case. This 
function should not be inside the core class, because some other 
server/client may not allow those additional packets. He can derive his 
own class to add a utility function to send those packets triggered by 
pulse generator.

There are several things you can try.
1. Use RequestRead functions before the RequestWrite to see if there are 
some 'stuck' packets there;
2. In test code for socketcommunication class, add a period of waiting 
time between establishing the communication and sending the packets in 
the client code.

It would be helpful to post a snippet of the code to see what happened.

Thanks,
James

-----Original Message-----
From: Patrick Cheng [mailto:cheng at isis.georgetown.edu]
Sent: Wednesday, July 11, 2007 9:45 AM
To: Hui Zhang
Subject: [Fwd: [IGSTK-Users] Connection lost using 
igstk:SocketCommunication]

Hi James,

I hope everything is well in Cali. Could you help address these two
questions on SocketCommunication class?

Thank you,

Patrick

-------- Original Message --------
Subject: [IGSTK-Users] Connection lost using igstk:SocketCommunication
Date: Wed, 11 Jul 2007 18:42:19 +0200
From: Vincent Gratsac <vgratsac at irisa.fr>
To: igstk-users at public.kitware.com

Hi IGSTK-users,

I'm currently developing a tracker class which will communicate with the
server through an ethernet connection.
So I'm using the igstk::SocketCommunication class available in the IGSTK
SandBox.
My Tracker class opens the communication and connects to the server, but
later, when I try to send data (via the RequestWrite method), I get a
timeout result.
I tried to send data just after connecting and this time it was a
success. Thus I conclude that the communication class lost the connection.

Here are my questions :

     - Currently, what is the state of the igstk::SocketCommunication
class ? Is it stable and completed ?
     - Is there a way in this class to ensure that the connection will
not be lost ? Like sending packets frequently in order to save
connection for example ?

Thank you for your help and have a nice day.

Vincent Gratsac

-- 
Vincent Gratsac
----------------------------------------------------
Unité/Projet VisAGeS U746
INSERM/INRIA/CNRS/U. de Rennes I
IRISA
Campus de Beaulieu, 35042 Rennes Cedex, France

Ph:  +33 (0) 2 23 23 49 20/ Fax: +33/0 2 99 84 71 71
email: Vincent.Gratsac at irisa.fr
http://www.irisa.fr/visages/
-----------------------------------------------------

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