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From: lyndon@ncc.UUCP (Lyndon Nerenberg)
Newsgroups: comp.mail.misc
Subject: Re: Interactive SMTP over phone lines
Message-ID: <1415@ncc.UUCP>
Date: Mon, 11-May-87 00:26:35 EDT
Article-I.D.: ncc.1415
Posted: Mon May 11 00:26:35 1987
Date-Received: Wed, 13-May-87 00:38:28 EDT
References: <16608@amdcad.AMD.COM>
Organization: Nexus Computing Corp.,  Edmonton, AB
Lines: 19
Keywords: smtp interactive modem LINE_NOISE
Summary: Keep it simple, eh?

> I don't know about you, but the last time I dialed-up a computer,
> I got line-noise.  Interactive smtp is nice but you need to have
> an error-free datastream between them. So, anyone for writing a point-to-point
> dialup tcp/ip?

All fine an well, but how about just wrapping a checksum and sequence
around each line.  E.g.

struct tiny_packet {

		unsigned char checksum;
		unsigned char sequence; /* overkill - % 8 should be fine */
		char line_of_text[];    /* CR/LF terminated */
}

Sure it chokes on 7 bit paths, but you get the idea... It's also
simple enough to be implemented very easily on a micro (a large
win in our case). Use a 7 line window and implied ACKS and away
you go.