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

@julian: Yes, it will take some time for the network interface to establish a connection with the access point; the E.init will trigger immediately after a power cycle (or save() invocation).

Change your code to this:

var Wifi = require('Wifi');
E.on("init", function () {
  Wifi.on('connected', function(){
    var http = require("http");
    http.createServer(function (req, res) {
    res.writeHead(200);
    res.end("Hello World");
    }).listen(8080);
  });
});

The doc for the Wifi class has a number of events that are emitted on specific situations that you can utilize to your advantage.