For an idea of how big an undertaking, google for & layer OSI (open systems
interconnect) and look up all the rfc's the article you choose mentions, the
read through all these several times going through each layer in detail so
you undestand how it all 'interconnects'.

Happy reading (there is a bit of it)

JJ

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of William Chops Westfield
Sent: Thursday, 22 January 2004 4:04 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC:] SMTP, POP3 ?


On Wednesday, Jan 21, 2004, at 06:00 US/Pacific, MSullivan wrote:

> specifically.. how to negotiatate (or figure out how to negotiate) the
> connection to the mail server ?
> I have a PIC board with an 802.11b wireless card on it,   and I have a
> wireless access point router connected to the internet through a cable
> modem.   I can communicate to the PIC card using a PC with a wireless
> card
> on it, that goes through the access point (with TCP/IP).   How do I
> negotiate the connection with the mail sever,  from the PIC
> board...through
> the router?   Will I have to send out IP addresses, passwords
> etc...... and
> what responses will I get and need to respond to?  How do I determine
> that?

I'm sorry, but you need to back up a few steps and learn a bit and learn
how the internet "works" at a basic level, especially with respect to
the
layering of protocols.   An SMTP client does not
"negotiate a connection" with a mail server; it simply opens a TCP
connection,
using whatever tcp APIs are provided.   the TCP layer handles the
negotiation
and "connection."  A TCP connection does not 'work through a router";
it sends
IP packets using internal APIs.  The IP layer handles (more or less,
using
additional protocols like ICMP or ARP) figuring out which router to use.

Writing SMTP code is easy; a nice ascii dialog.  writing a complete
internet
stack containing all the layers needed to communicate over an 802.11b
card
is a major undertaking...

BillW

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