For this challange we need to figure out how to open a .sal file.
Well, we get this file and some internet searching later I figure out that there's a tool called saleae-logic2 that can open this file.
On archlinux this can be acquired from the aur/saleae-logic2 package.
After opening the file I spent quite a bit of time trying the different analyzers, before noticing that the signals themselves form the letters of the flag.
After copying the letters to a txt file I got the flag.
Try to convince yourself that you can see the letters HTB in the picture above