My code for AX.25 is part of the gensio library.  The individual files are at:

https://github.com/cminyard/gensio/blob/master/lib/gensio_ax25.c

https://github.com/cminyard/gensio/blob/master/lib/gensio_ax25_addr.c

The gensio library is a whole framework for all kinds of stream and
packet I/O.  But you should be able to pull out the middle of the file
that has the state machine, pretty much unmodified, and use it.

One thing that might be more interesting is I documented a bunch of
bugs in the spec in the comments at the top of the gensio_ax25.c file.

Anyway, it's available if you want it.  I'd be willing to split out
the state machine if you wanted something that was individually
maintainable.

-corey

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