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    <p>It may be over kill for this but a method that has yet to fail me is SLIP, RFC 1055 the 1988 version. For years i have used it to map blocks of data into a 7 or 8 bit ASCII stream for transmission over every media I have encountered. Then used the inverse or some modification of it to convert the stream back to their needed configuration on the other end. Examples of the code in C are in the RFC. I always used Phil Karn's suggestion to use the same character for both the start and end of packet. </p> <p>That way only one routine is needed to deal with the stream. It gobble up characters until the SOP/EOP is encountered. This was chosen to deal with noise that can accumulate on the input of radio links as they sit idle awaiting data. Phil address that in other writings.</p> <p>I usually use \x0D or \x0A which ever the system the debugging tools run on uses for as a carriage return and use the ever popular back slash '\' as the escape character. Now and then it is handy to use another control code or use differ values for the control characters to reduce the packet size. Use of the system as allows a terminal program with the code for SLIP added and a few modifications  to function as a monitor and as tool to enter packets into the stream by hand.</p> <p>I have always found I had enough options if the first character in the packet indicated the options on the other end. Of course some form of error checking and either/or error recovery and ability to re-transmit a MUNGED packet must be provided. For small packets of data sent over highly reliable links a simple checksum might do or in the case transmissions using three mineralized volcanos as antenna sites that a bit farther apart than one would like a highly redubpndantr Fowarad Error Correction algorithim is right at home.  </p> <p>SLIP is versatile enough to take data from a 16 bit Motorola 68HC11 and reconstruct it on a 32 bit Intel system if the programmer reverses the endedness and takes care of the offset between 16 &amp; 32 bit data.</p> <p>Gordon </p> <p>Gordon Couger Stillwater, OK</p>
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