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Forum Index : Microcontroller and PC projects : TCP server and WebMite Release - V6.00.01

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homa

Guru

Joined: 05/11/2021
Location: Germany
Posts: 467

Posted: 11:47pm 29 Dec 2024

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okay, a few questions about TCP servers

I want to write a TCP server in Basic and use it to provide a service.
If I set ‘OPTION TCP SERVER PORT n’ I can define an interrupt routine ‘WEB TCP INTERRUPT’ in the programme.
In this routine, data from the TCP stream is then transferred with
FOR a% = 1 To MM.INFO(MAX CONNECTIONS)
WEB TCP READ a%, buff%()
is read. I can find out the active connection number by checking with ‘LLEN(buff%())=0)’.
Unfortunately I cannot read the requesting/sending IP?
Then I would like to respond to the request. If I use ‘WEB TCP SEND cb%, data%()’ for this and do not close the connection (‘WEB TCP CLOSE cb%’), it is closed after a while by a timeout? ‘Warning: No response to request from connection no. 1’
Because sending after this message leads to ‘Warning: LWIP send data timeout’

How do I keep control of the TCP connection?

WEB TCP SEND ... It just sends exactly what is in the LONGSTRING data%() and it
is up to the Basic programmer to close the connection when appropriate.

Do I always have to wait for a connection through the interrupt? And do I get status messages in the MM variables? Similar to UDP?

What exactly is this ‘OPTION WEB MESSAGES ON/OFF’ for?
And is there a list with a short explanation of all WEB messages?

As I said, just a few small questions about TCP ;-)

Matthias

Malibu
Senior Member

Joined: 07/07/2018
Location: Australia
Posts: 260

Posted: 11:04pm 30 Dec 2024

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Quote WEB TCP SEND cb%, data%()

Not sure where the cb% is coming from, you should be sending it to a%, the connection number that the web stream came in on.
AFAIK, I think you'll be getting your warnings because you're trying to send/close a connection that isn't there.
You can't 'control' the connection. It's only there when a HTTP request comes in.
The senders IP is usually part of the incoming stream (Not always though)

John

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