Question

Continous connection to Port on Server

Asked by: ryankahan

I am trying to connect to a server and port to receive string data . It appears that the server closes the port every few seconds, I need to immediately reconnect if the connection is closed. I have attached the code that I am using the code that I use to connect to the server.

TcpClient client = new TcpClient(ServerIP, ServerPort);
                        //Check that there is a active connection
                        if (client.Connected)
                        {
                            //Get the string
                            NetworkStream network = client.GetStream();
                            StreamReader SMDRReader = null;
 
                            string SMDR = "";
                            SMDRReader = new StreamReader(network);
                            //Loop thru data received
                            while ((SMDR = SMDRReader.ReadLine()) != null)
                            {
 
                                //Check if there is data to save
                                if (SMDR.Trim() != String.Empty)
                                  {
                                    //Do Processing
                                   }
 
                                SMDR = "";
 
                            }//Loop thru data received

                                  
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Asked On
2009-03-20 at 01:11:05ID24248557
Tags

TCP port

,

connection

Topics

Microsoft Development

,

TCP/IP

,

Miscellaneous Networking

Participating Experts
1
Points
500
Comments
10

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Answers

 

by: ryankahanPosted on 2009-03-24 at 04:29:18ID: 23966737

Hi guys,

We need your urgent response on this request please!  Is there anything more you might need from us to get assistance?

Essentially we have a service on win2k3 server written in C# that connects to a PBX's SMDR/CDR IP+PORT (TCP/UDP) to retrieve the PBX's provided real-time SMDR/CDR (call data records) data.
This particular PBX (Samsung 7400) closes/drops the port connection every 4x mins.  We have eliminated all/any network related possible issue's.
At the moment a windows scheduled task that is scheduled to run every 1x min (lowest that windows allows us to set) that calls a batch file that re-estblishes the TCP connection for the service, batch file contents: "sc control smdrcdr_service 150"
The issue is that when the connection drops, the time between the batch is run (connection re-estblshed), we lose/miss this CRITICAL SMDR/CDR data that the PBX's made available, but we could not retrieve it as the connection to the PORT was lost/dropped for that period.
This is causing major havoc for us and we should receive about 10-15k SMDR/CDR records a day, but we currently lose/miss about 2-3k records.

Please HELP!

Thank you in advance for your assistance.

 

by: DanRollinsPosted on 2009-03-24 at 15:21:08ID: 23974035

Perhaps the server is looking for some kind of stay-alive message every so often.  Is there anything in your documentation about the server that might indicate such a thing?  Can you send a sort of "dummy" packet every couple of minute to let it know you are still listening?

 

by: ryankahanPosted on 2009-03-24 at 19:18:20ID: 23975511

Unfortunately we have limited documentation from the PBX.

Ideally we would like to immediately (within milliseconds) reconnect if we are disconnected. At the moment we use a scheduled task which only checks once a minute.

 

by: DanRollinsPosted on 2009-03-24 at 20:02:02ID: 23975733

What about intentianally disconnecting and reconnecting every so often?  If you can control when the disconnects happen, you might avoid data loss.

 

by: ryankahanPosted on 2009-03-25 at 00:27:27ID: 23976687

We can't really disconnect and then reconnect as this is currently happening and we are loosing data. We don't have control of when the data comes from the port. We are just looking for a way to make sure that if the connection goes down we must reconnect as soon as possible

 

by: DanRollinsPosted on 2009-03-25 at 13:09:35ID: 23984129

If you reconnect immediately (rather than at a polling interval) then you can at least control when it happens (e.g., when you detect a lull in the data).

Another idea would be to use a much smaller polling interval -- on the order on n milliseconds rather than n seconds. You could have your monitoring process run constantly rather than wait for the task manager to run it.

Even so, any such polling monitor could allow the system to lose vital records. It seems to me that there should be some mechaism or setting that allows you to tell the device to not disconect.

I'll see if I can find documentation on the device. If you have a PDF file handy, can you post it here?

20120131-EE-VQP-002

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