This is the port of axtls for Unikraft as external library. You will need lwip to make it work.
To run ssltest.c as a unit test, you'll need pthread support, e.g., add the following line to the LIBS variable in the Makefile:
...$(UK_LIBS)/lwip:$(UK_LIBS)/pthread-embedded:
Note that you'll need a filesystem in place and the certificate files for all tests to pass.
Please refer to the README.md as well as the documentation in the doc/
subdirectory of the main unikraft repository.