Reading brain waves with Espruino

Hi Gordon,

so I just get zeros as values. I tried it with the hex code 0x04 (attention level).
In the documentation in the link below I saw there are also a hex code to enable the outputs but I don´t konw how to integrate that into the espruino program.

I added var buf = 0x04 in the code.

Found this documentation on the thinkgear website with the codes:
http://developer.neurosky.com/docs/doku.php?id=thinkgear_communications_protocol#data_payload

var buf = 0x04 ;
var gatt,characteristic;
setWatch(function(e) {
NRF.requestDevice({ filters: [{ adress: 'c4:64:e3:e8:d6:e9' }] }).then(function(device) {
  console.log("Found");
  return device.gatt.connect();
}).then(function(g) {
  console.log("Connected");
  gatt = g;
  return gatt.getPrimaryService(
    "039afff0-2c94-11e3-9e06-0002a5d5c51b");
}).then(function(service) {
  return service.getCharacteristic(
    "039afff8-2c94-11e3-9e06-0002a5d5c51b");
}).then(function (c) {
  console.log("Got Characteristic");
  characteristic = c;
  characteristic.on('characteristicvaluechanged', function(event) {
     processBrainData(event.target.value.buffer);
  });
  return characteristic.startNotifications();
}).then(function() {
  console.log("Connected.");
  enableOutput(buf1);
});
      }, BTN, { repeat: true, edge: 'rising' });
function processBrainData(buf) {
  var d = new Uint8Array(16);
  setInterval(function() {
  print(d.slice().map(x=>x.toString(16).padStart(2,0)).join(" "));
}, 500);
  }