I discovered some things today while doing GDL90 message parsing:
1) I didn't understand CRC16, and I had a subtle error causing some messages to fail. Fixed now
2) Part of the GDL90 document says to refer to RTCA/DO-282, Section 2.2 for how a payload is specified. This document is not free, because of course it isn't.
3) Stratux was written in go. Reverse engineering parts of the source is challenging for me as I don't know go.
4) Staring a bitshifts and hex will make you go slowly mad
I got all the CRC stuff working in the end. Not sure what I'm doing about the paywall (definitely not paying $800 for a specification that should be free). I'll probably reverse engineer it out of one of the other open source GDL90 parsers.
It has been a while since I got to sit down and be in "the zone" with code. It feels nice.
Aut
@Aut@hachyderm.io
(He/ Him) Software Engineer that flies planes as a hobby. Currently serving as the Social Media Coordinator of my EAA chapter and the President of my flying club. I'm building an RV-10 airplane (the kind you can sit in and fly) in my basement 🛩️. Full time Linux user. I dabble in embroidery, theater, circuits, and other random things. Profile picture from Jazzybee's Stardew Valley Character Creator
hachyderm.io
Aut
@Aut@hachyderm.io
(He/ Him) Software Engineer that flies planes as a hobby. Currently serving as the Social Media Coordinator of my EAA chapter and the President of my flying club. I'm building an RV-10 airplane (the kind you can sit in and fly) in my basement 🛩️. Full time Linux user. I dabble in embroidery, theater, circuits, and other random things. Profile picture from Jazzybee's Stardew Valley Character Creator
hachyderm.io
@Aut@hachyderm.io
·
Apr 09, 2026
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