I see. That might explain some things, although they have a numerical coding system for each category.
Still, I wonder why the numbers change after 10 minutes for Drolo.
I think the "unknown" mac addresses are that:
https://www.google.com/covid19/exposurenotifications/https://developer.apple.com/docuмentation/exposurenotification
In the Apple link, change the Capital m to a normal lowercase m
An API for covid contact tracing apps that Google and Apple compulsorily installed on android and ios mobiles.
Each mobile turns on periodically and transmits a random bluetooth address to maintain anonymity, while tracking all the signals it finds in the area. This is transmitted to a server that can associate the random mac with a specific mobile. With this functionality, contagion tracking apps managed by authorized bodies can be developed. This random address changes every 10-20 minutes according to Google.
In Spain Apple and Google installed it at the beginning of the pandemic in March-April 2020. Probably they have also installed it in the USA.
In short, tracking technology to further spy on the population implemented with the excuse of COVID.