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Editorial Team
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Asked: 2026-05-31T21:35:51+00:00

I have a server application that receives some special TCP packet from a client

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I have a server application that receives some special TCP packet from a client and needs to react to it as soon as possible by sending an high-level ACK to the client (the TCP ACK won’t suite my needs).

However, this server is really network intensive and sometimes the packet will take too long to be sent (like 200ms in a local network, when a simple server application can send it in less than 1ms).

Is there a way to mark this packet with a high-priority tag or something like that in Delphi? Or maybe with the Win32 API?

Thanks in advance.

EDIT

Thanks for all the answers so far. I’ll add some details. My product has the following setup: there are several devices that are built upon vehicles with WIFI conectivity. When they arrive at the garage, those device connect to my server and start to transmit data.

Because of hardware limitations, I implemented a high-level ACK to make the device aware that the last packet arrived successfully (please, don’t argue about this – the data may be broken even if I got a correct TCP ACK). However, if I use my server software, that communicates with a remote database, to issue this ACK, I get very long delay (>200ms). If I use an exclusive software to do this task, I get small latencies (<1ms). So, I was imagining if I could just tell Windows to send those special packets first, as it seems to me that this package is getting delayed so the database ones can get delivered.

That’s the motivation behind my question.

EDIT 2

As requested: this is legacy software and I’m using the legacy dclsockets140.bpl package and Delphi 2010 (14.0.3593.25826).

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1 Answer

  1. Editorial Team

    IMO it is very difficult to realize this. there are a lot of equipment and software involved. first of all, if you communicate between 2 different OS’s you got a latency. second, soft and hard firewalls, antiviruses, everything is filtering/delaying your package.

    you can try also to ‘hack’ the system(this involve some very good knowledge on how the frames/segments are packed/send,flow control,congestion,etc), either by altering it from code, either by using some tools like http://half-open.com/ or others.

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