Unfortunately PEPP-TP seems to have ditched this approach in favor of a commercial centralized infrastructure
https://nadim.computer/posts/2020-04-17-pepppt.html
On April 3rd, 2020, a team of 26 European researchers, led by the EPFL's Prof. Dr. Carmela Troncoso, published the whitepaper for the Decentralized Privacy-Preserving Proximity Tracing< protocol, DP-3T, meant to enable privacy-preserving contract tracing mechanisms at scale in order to help track and manage the COVID-19 pandemic in the general population...