`Error: Not connected to the internet` when invoking http.createServer

I'm pretty sure the problem is that JavaScript executes asynchronously. Obviously I don't know what is in your startAP/enableWifiScan functions, but usually when you execute a command startAP, it returns immediately and calls a callback when the AP is connected.

For instance for Espruino Wifi you need:

wifi.startAP(ssid, options, function() { 
  // this is executed when connected and should start the server
});
// this code is executed before it is connected

Also, which device are you using the Wifi on?