I've been working on getting native AX.25 support into Pat, as it has been a hindrance to me to not have it, and it's kind of a pain to set up Linux. I have a working (though extremely experimental) version at this point, and I thought people might want to try it out. And hopefully give me feedback if they do :-).
Tested on Linux x86_64, Linux Raspberry Pi, and Windows. Only with direwolf. It should work on BSD and MacOS without issue.
I'm not currently supplying any binaries. If you have reasonable Linux knowledge the instructions will lead you through how to build it. On Windows, I don't know how to distribute something, and building it is a pain. If anyone would like to help with that...
This is based on the gensio library, which has C, C++, Python, and obviously Go bindings. So if you are doing your own AX.25 software, this will make it a lot easier.
-corey - AE5KM