Location tracking

Would you be ok posting up your setScan code? I've just been doing this:

var n = 0;
NRF.setScan(function(d) {
  n++;
  if (d.id=="f3:ec:65:44:85:db random") {
    LED1.write(d.rssi>-88);
    LED2.write(d.rssi>-85);
    LED3.write(d.rssi>-82);
  }
});
var hist = [];
setInterval(function() {
  console.log(n/5,"adv/sec");
  while (hist.length>20) hist.shift();
  hist.push(n/5);
  n=0;
}, 5000);

With around 15 advertising packets/second received, and it still seems stable. When connected the amount of advertising packets received drops from 15 down to 8/9 though - so having a connection open means it misses quite a lot.