Architecture: WiFi generic object interface

As requested by @Kolban.

Still not sure on a name, apart from network? As a starting point:

wifi.setPower(onOrOff, function(err) { ... })

Initialise WiFi, or turn it off. That could be handy?

wifi.connect(ssid, key, [options], function(err) { ... });

Connect to the given access point. options could be an object extra stuff like the security type.

The callback is called with err==null on success. Could maybe also return the IP?

wifi.getAPs(function(err, aps) { ... });

Call the callback with a list of access points, of the form aps = [ { ssid, enc, signal_strength, mac_address } ].

The callback is called with err==null on success.

wifi.getConnectedAP(function(err, ap) { ... });

Call the callback with the name of the currently connected access point. The callback is called with err==null on success.

wifi.createAP(ssid, key, channel, enc, function(err) { ... })

Create an access point with the given ssid, key, channel, and encoding. Encoding can be 0, undefined, "open", "wep", "wpa_psk", "wpa2_psk" or "wpa_wpa2_psk".

Example: wifi.createAP("ESP123","HelloWorld",5,"w­pa2_psk",print)

wifi.getConnectedDevices(function(err, devices) { ... });

If if AP mode (with wifi.createAP), call the callback with the second argument as an array of { ip, mac } objects - one for each connected device.

wifi.getIP(function(err, ip) { ... });

Call the callback with the current address details: {ip:string, mac:string, ...?}

The callback is called with err==null on success.