I have set up my router to only allow known mac-addresses on to the network (whitelist)
So I have asked/forced my family members with phones to use a fixed mac (for this network)
I have many other home-brew ESP devices that don’t have a moral issue with being tracked by businesses (they are always home), but that I can use nmap to track if they are (still) connected to the WiFi.
Will definitely look into bluetooth and “monitor”.
Thanks for the info. Slowly finding my way through all the concepts, add-ons, integreations etc. of home-assistance. (It’s like learning a foreign language, grammar, vocabulary…)