After a first app failure (stopcovid19), France uses the ROBERT protocol in its second app TousAntiCOVID (which is just a rebrand+slight pivot into focused news); apparently the protocol is joint-developed between Fraunhofer (Germany) and INRIA (France).
The irony is that Germany uses iOS contact tracing, so as I live near the border I miss detection of a high vector.
Scratch that, I -would miss-, it I used the app, which I don’t because it has to be opened, manually toggled on, and stay in the foreground to do any contact tracing.
Even if it were not for the battery use, the power of defaults means that the app is rarely activated by people, (when it’s installed at all since it’s not listed in the initial iOS alert you get and pick France).
Desperate posters “here I activate TousAntiCOVID” are being placated in shopping malls and stuff.
It’s ridiculous.