There was a talk at defcon about this. I’m on mobile but you should be able to find the esp32 firmware for their detector on github.
Perhaps "Flock-You Detection", by SimeonOnSecurity?
<https://simeononsecurity.com/articles/flock-you-detection-pr...>
Perhaps "Flock-You Detection", by SimeonOnSecurity?
<https://simeononsecurity.com/articles/flock-you-detection-pr...>