You could just have a simple Wifi deauth beacon. You can do it with a simple ESP8266 and could either kick everything off the network or target blacklisted MAC

You could just have a simple Wifi deauth beacon. You can do it with a simple ESP8266 and could either kick everything off the network or target blacklisted MAC address ranges. It's usually illegal to do this to someone else's network just like running a real Wifi RF jammer.