[lwip-users] Re: [lwip] SLIP support in Windows

[James Roth]

Fabio Fumi wrote:

>Hi
>I'm trying to use the approach you suggested, but I'm
>still missing something. Maybe you can give me some
>more help...
>The fact is that when I'm trying to use the modem-like
>connection, the standard dial-up procedure first ask
>the 'modem' a kind of handshake consisting of a string
>of repeted characters. What should the 'modem' answer
>to that in order to be recognized from the PC? Then, a
>series of AT commands are sent, the last being the
>true dialing one (ATDT...) which is answered by the
>modem with a 'CONNECT xxxx'. All of this is obviously
>a start-up procedure, executed only once and before
>the communication stream start, so why do you think
>the 'AT' commands should be added in the standard
>'poll' procedure?
>Do you have any reference to get information from
>about the standard modem procedures?
>
>Thanks so much
>have a nice week-end
>  Fabio
>
>
    I just humor windows with an OK\r reply to most commands.  Windows 
sends the AT... command followed by a \r.  The ATDT command or the 
CLIENT string (with no \r) cause me to go into SLIP mode.  I also put 
delays in the AT code for realism.

while (1)
{
    if (got ATDT...)
    {
        write ("CONNECT\r")
        break;
    }
    else if (got AT...) /* an AT other than ATDT */
    {
        write ("OK\r")
    }   
    else if (got CLIENT)
    {
        write ("CLIENTSERVER")
        break;
    }
}

do_slip()

Good luck!

-- 
James Roth
Shugyo Design Technologies
http://www.shugyodesign.com/



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