At https://www.ohwr.org/project/ppsi/uploads/0e5df6a705afbd7d72e05233185c66b1/ppsi-manual-130311.pdf you can now
find the PPSi manual, that lists the features of the project, some internal details
and the tools offered withing PPSi. It s meant to help developers who want to
add their own protocol extension or their new architecture.