Annoy people with captive portals! This is a little program you can
run on a WiFi-enabled ESP82666 micro-controller. It opens a new WiFi
network and then forwards people connecting to the network to a static
captive portal page payload.html
.
The project comes with a DNS "server" that answers all requests with the IP address of the ESP8266. Smartphones and browsers detect this as a captive portal.
Note that I quickly hacked this together, beware of bugs and incompatibilities.