TCPIP Connection status

Hi

Looking for some professional advice and possibly some code samples, I'm developing a solution for TCP Clients/TCP Listeners(no direct communication between then, only talking to other listeners and clients.)

This is basically a heartbeat detection to see if the listeners and clients are available for connection.

Once we know their status we will update our DB table to say that they are online or offline.

has anyone ever put this in place and could anyone suggest best way to do this?

* tcpipC#

Last Comment

ambience

8/22/2022 - Mon

it_saige

3/1/2018

I don't have any examples in front of me, but I have done something like this in the past. Essentially, you want to setup a UDP Broadcast from the both source computers and target computers. The source computers send datapackets that contain information that the target computers will use in order to record or connect to them source computer. The target computers will send datapackets that let the source computers know that they are online.

You could do a search for Network Discovery or AutoDiscover Services if you want to learn more about it, but a decent example can be found here:

http://www.nullskull.com/a/1551/clientserver-autodiscovery-in-c-and-udp-sockets.aspx

-saige-

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ambience

3/1/2018

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razza_b

3/4/2018

ASKER

thanks for feedback guys the way I see it is if I were to send a message and no response back within a certain time period I'd say that's offline, as surely some message would return otherwise(depending on the setup at the other end).

if its a server then wait on clients reconnecting or if i'm the client I then need to reconnect back into the server from which I disconnected form.

ambience

3/5/2018

IF nothing is listening on a port an immediate TCP level error will be returned. If the host is down it would take TCP upto ConnectionTimeout to return an error. You can alter the default connection timeout.

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