On 2018-08-02 12:08, Grant Taylor : All wrote:
> On 08/02/2018 12:34 AM, xlar54 wrote:
>> at the moment, webservers dump the pages so quickly that the wifi modem
>> and/or code cant keep up.
>
> This seems like a modem / gateway / web server failing to me.
>
> To me, there are two communication streams, one on either side of the
> gateway (like the Wifi232).  One is serial to the old computer.  The
> other is TCP/IP over some sort of network (wired or wireless).
>
> I would expect that the serial side can be paused by (I think) dropping
> DTR.  (Maybe it's a different signal.)  The point being for the (retro)
> computer to indicate that it is not ready to receive any more data from
> the other end.

Or ClearToSend (CTS) if you do 7-wire serial.

> I would also expect that the TCP/IP side could similarly cause the web
> server to pause sending data.  I'm not completely familiar with the
> mechanics of how.  But I am confident that the TCP/IP client can tell
> the sending web server how much buffer it has available.  The idea being
> that the web server's sending side should not exceed said buffer.
>

Yes, I think both 0 and 1 byte free at my end is a possible response to
incoming packets when you have a hard time handling the incoming data
stream.

Telling the remote end you have only 1 byte left in the buffer is used
for instance when tarpitting spam sending email servers, to force them
to waste a lot of resources for every sent byte so that they are busy
creating packets for an email your server wont accept instead of
spamming others at that instance.

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