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How to keep connections open with a multi-threaded serial driver

Solved1.70K views19th July 2023connection Multi-Threaded Timer multithreaded serial
5
Laurens Moutton [SLC] [DevOps Enabler]8.68K 2nd March 2021 0 Comments

I have a driver that needs to distribute data to 42 receivers. As that amount is variable and creating a driver with 42 fixed ports is too much, so the choice has been made to work through a multi-threaded serial timer. Every second it will be sending data.

This is working good to distribute the data, however there is one problem: every time data gets sent it's opening and closing a new TCP socket. This means opening 42 sockets and Windows by default reserves such a socket for 4 minutes so we're running out of ports.

Is there a way for a multi-threaded serial timer to keep the socket open and re-use this? Kind of link an opened socket to a row in a table over which the multi-threaded timer iterates.

The driver does not wait for a response (only sends commands), could this be a cause and could the solution be to let the receiving side send back a response?

Could a multi-threaded http timer be a solution with keep alive defined?

Other alternative that I can think about, but like to avoid, would be to open the TCP socket in the QAction and leave them open there. I would like to avoid going through SLScripting and use the core software to handle the connection through SLPort instead.

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 19th July 2023

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Marlies Vandenberghe [SLC] [DevOps Member]2.97K Posted 25th March 2021 0 Comments

The only solution currently possible would be to reduce the amount of time the socket keeps open in windows. This can be changed in Windows Registry.

More information can be found on this page:

Appendix A: TCP/IP Configuration Parameters | Microsoft Docs

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 19th July 2023
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