I hope Spock is right because I’m not sure if an headache is a sign of wisdom
So the only affordable Logic Analyser that works with Linux and I could get nearby to get rid of portuguese evil customs was the BitScope Micro (BS05).
Installation on Ubuntu was easy (amazing how things evolved!) and it works. Documentation isn’t great but it is enough.
Now the tough part: finding sense in all captured data. 300 baud inverted seems… something.