Re:Cave-Link: Underground text communication system
by lazide on Wednesday November 10, 2021 @09:48AM
(#29175158)
Also possible they are using a 1 byte CRC heh
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Re:Cave-Link: Underground text communication system
by kabdib on Wednesday November 10, 2021 @11:47AM
(#29176849)
A piece of communications gadgetry even mentioning checksums is like a car salesman proudly claiming "... and this baby comes with working brakes!" The very pronouncement leads to worry, and additional questions (like this very thread, QED :-) ).
My inexpert digging came up with: They use APRS packets, which use AX.25, whose framing includes a 16-bit Frame Check Sequence, which looks like it came from HDLC, and is a 16-bit CRC-CCITT. Phew.