Connecting to one of available WIFI's

Does this Wifi scan snippet work for you?

require('Wifi').scan(function(e) {
  console.log(e);
});

/*
output:
[
  { "rssi": -78, "channel": 1, "authMode": 4, "isHidden": false,
    "ssid": "SSID1",
    "mac": "b8:8d:12:68:24:3f"
   },
  { "rssi": -52, "channel": 1, "authMode": 4, "isHidden": false,
    "ssid": "SSID2",
    "mac": "a2:a0:bb:f2:04:59"
   }
 ]

*/