>I have just made it so that I can send E-mail from a pic.
>I can read PORTB and send it in an email message.
>This can be done at any interval, or just stay on-line and keep sending.
>
>It can also generate web pages.
>
>Just think, put one of these in a vending machine and get the status of the
>machine
>without getting wet. Put one in your home and see if you left the TV on.
>
>I can make it interactive to read mail also.
>
>This is very exciting and so easy even beginners will be able to implement
>this.
>
>Will post more.
>
>Red
>Robert Hoar
>
>rwhoarspam_OUTtecnet1.jcte.jcs.mil
>@spam@srhoarKILLspamglobal2000.net
>
>With Interest in Astronomy, Celestrial Navigation,
>Embedded Controls, Nuclear Power.
>
>Available for information, contact me at:
>ICQ #10764173
>
>For info on
>:How to make your own PCB's
>:Drive stepper motors
>
>try
><http://www.members.global2000.net/~srhoar/>
>

>
> I have now added a page to my web site which was created by a pic.
> I can send email and files with it.
> It does not connect through a PC.
>
> xtal -->PIC-->MODEM-->Internet
>
> there are only 6 parts :
>
> 3 resistors
> 1 pic
> 1 crystal
> 1 MODEM (some old 2400 I had)
>
> The Pic calls up the server and sends the mail or what ever.
>
> I will post all on my web page by next weekend.
>
>
> Red
> Robert Hoar
>
> RemoveMErwhoarTakeThisOuTtecnet1.jcte.jcs.mil
> srhoarEraseME.....global2000.net
>
> With Interest in Astronomy, Celestrial Navigation,
> Embedded Controls, Nuclear Power.
>
> Available for information, contact me at:
> ICQ #10764173
>
> For info on
> :How to make your own PCB's
> :Drive stepper motors
>
> try
> <http://www.members.global2000.net/~srhoar/>
>

> On Sat, Apr 22, 2000 at 03:33:25AM -0300, Sebastian Garcia wrote:
> > Hi Peter,
> >
> > Just wanna know where I can get more info on TCP/IP basic understanding, the
> > minimal for trying to do one of these uC-based email boxes. Can You point me
> > to some URL's?
> >
> > Did You made anything in this field of uC plugged to the net?
>
> I'd like to point out that there may be a simpler way. The real problem in
> all of this is TCP. TCP is a robost protocol that guarantees reliable
> stream based end to end communication. Unfortunately this requires buffering,
> flow control, sliding windows, and other mechanisms to enforce the gurantees
> that TCP makes.
>
> Simply put the average PIC doesn't have the resources to effectively do TCP.
> And since the E-mail protocol runs on top of TCP, it won't be easy to do.
>
> But there is another way: UDP. UDP is a protocol at the same level as TCP
> but makes no promises whatsoever about delivery, order, flow control or
> anything else. The great thing is that it makes it extremely simple. The UDP
> header consists on nothing more that a short header that defines the source
> and destination ports, length and checksum for the data. That's it. So your
> application can choose which features of TCP are required for the application
> instead of having to implement all the features that TCP requires.
>
> So how can you use it? Not difficult fortunately. UDP has exactly the same
> routability as any other internet packet. Your machine can dial up and
> fire off UDP packets to anywhere on the internet. So what you do is set up
> a server machine on the net somewhere that accepts UDP packets from the remote
> uC machines, formulates E-mail, then sends the E-mail to it's final
> destination.
>
> I have two students currently doing a design project on the concept. They're
> using SLIP as the underlaying IP layer due to its simplicity, and will be
> firing off UDP packets to a server. The three most excellent things about
> using SLIP/UDP are 1) The time/headache savings of buying into proven
> technology. 2) The worldwide routability described above and 3) The simplicity
> of writing servers, which consist of little more than opening a socket and
> sending an receiving.
>
> As for information of course the Internet RFCs are the main source.
>
> BAJ