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

[Fabio Fumi]

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


--- Conny Öhult <address@hidden> ha scritto: >
Hi Fabio,
> I assumed in my previous answer that you where using
> lwIP's sioslipif.c .
> If you are using uIP and the C64 port I would add it
> to rs232dev_poll at 
> the end of the default fallthrough (before the
> break).
> 
> The code could be implemented like this (haven't
> tested it):
> 
> /* Modem command 'AT...<CR>'. Send OK in response to
> modem cmd */
>   static u8_t ok_str[] = "OK\r\n";
>   if(slip_buf[0] =='A' && slip_buf[len] == '\r') {
>          for(j=0;j<sizeof(ok_str);j++) {
>                  SIO_SEND(ok_str[j]);
>          }
>   }
> 
>   In case of a DCC you would add something like the
>   following:
> 
>   /* Send CLIENTSERVER in response to CLIENT (for
> WinNT direct cable 
> connection) */
>   static u8_t server_str[] = "CLIENTSERVER";
>   else if(len+1 == 6 && slip_buf[0] ==
>   'C' && slip_buf[5] == 'T') {
>          for(j=0;j<sizeof(server_str);j++){
>                  SIO_SEND(server_str[j]);
>          }
> 
> }
> 
> /Conny
> 
> At 10:32 2002-04-02 +0200, you wrote:
> >  Hi Conny!
> >
> >  Thanks for your answer, but I still need some
> >clarification. What do you mean with 'right after
> the
> >fallthrough'?
> >  I'm actually trying to port uIP
> >(http://dunkels.com/adam/uip/news.html; by AD as
> well)
> >and my SLIP driver is an adaptation of the porting
> >made for the C64. The RS232 driver implements
> >basically three functions: rs232dev_init,
> >rs232dev_poll, and rs232dev_send. Should I change
> the
> >init one?
> >  I'm very new to this subject, and any furhet help
> is
> >much appreciated! Thanks.
> >
> >  bye
> >   Fabio
> >
> >--- Conny Öhult <address@hidden> ha
> scritto: >
> >Don't think you can use the DCC feature in 95, 98
> or
> > > ME. Only in NT, 2K and XP.
> > > You can however create a modem connection in ME
> and
> > > modify your SLIP driver
> > > to emulate the modem.
> > > I haven't tried it, but I think you only have to
> > > send back an "OK\r\n" in
> > > reply to a modem cmd. They all begin with "AT"
> and
> > > end with "\r\n".
> > >
> > > So you'll probably only have to add this to your
> > > slip driver (right after
> > > the fallthrough):
> > >
> > > /* Modem command 'AT...<CR>'. Send OK in
> response to
> > > modem cmd */
> > > static u8_t ok_str[] = "OK\r\n";
> > > if(((u8_t *)q->payload)[0] =='A' && ((u8_t
> > > *)q->payload)[q->len] == '\r') {
> > >       for(j=0;j<sizeof(ok_str);j++) {
> > >               sio_send(ok_str[j]);
> > >       }
> > > }
> > >
> > > In case of a DCC you would add something like
> the
> > > follwing:
> > >
> > > /* Send CLIENTSERVER in response to CLIENT (for
> Win
> > > NT direct cable
> > > connection) */
> > > static u8_t server_str[] = "CLIENTSERVER";
> > > else if(recved == 6 && ((u8_t *)q->payload)[0]
> ==
> > > 'C' && ((u8_t
> > > *)q->payload)[5] == 'T') {
> > >       for(j=0;j<sizeof(server_str);j++){
> > >               sio_send(server_str[j]);
> > >       }
> > >
> > > }
> > >
> > > /Conny
> > >
> > > [This message was sent through the lwip
> discussion
> >list.]
> >
>
>______________________________________________________________________
> >
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> 
>
-------------------------------------------------------------------------
> Conny Öhult
> Luleå University of Technology
> Department of Computer Science and Electrical
> Engineering
> SE-971 87 LULEÅ, Sweden
> Phone: 0920-49 1577 (Intl: +46 920 49 1577)
> Fax: 0920-49 2191 (Intl: +46 920 49 2191)
>
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> 
> 
> [This message was sent through the lwip discussion
list.] 

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