Perhaps they should write a proper protocol specification, so that different implementations are interoperable and can be used with different kind of devices.
Indeed, TFA appears to link to one or more protocol specifications [0],[1].
However, it is not clear if these are proper/true Scotsman protocol specifications.
2 comments
[ 2.5 ms ] story [ 15.1 ms ] thread[0] https://github.com/DP-3T/documents
[1] https://github.com/TCNCoalition/TCN