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I had two issues during testing:

1. I think the parameters in the set methods were in a wrong order: typedarr.set(array [,offset])
   
2. NRF.setAdvertising has not accepted the Uint8Array as object: Error message "Uncaught TypeError: Expecting object or undefined, got Uint8Array"
   
   

But, with some small adjustments below, I got your code running. The device is then successfully recognized as an iBeacon.

var advertise = function(options) {
  var d = new Uint8Array([
    0x02, // Number of bytes after first AD structure
    0x01, // BLE_GAP_AD_TYPE_FLAGS
    0x04, // BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED
    0x1A, // Length
    0xFF, // BLE_GAP_AD_TYPE_MANUFACTURER_SPECIFIC_DATA
    0x4C, 0x00, // 0x004C == Apple
    0x02, 0x15, // iBeacon type + length
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,// iBeacon proximity uuid
    0, 0, // major
    0, 0, // minor
    0xc5]); // 2'c complement RSSI at 1 meter distance in dBm
  
  d.set(options.uuid,9);
  if (options.major!==undefined) d.set([options.major>>8,options.major],25);
  if (options.minor!==undefined) d.set([options.minor>>8,options.minor],27);
  if (options.rssi!==undefined) d.set([(options.rssi<0)?(options.rssi+256):options.rssi],29);
  
  var e = [].slice.call(d);
  NRF.setAdvertising(e, {interval:100});
};

advertise({
  uuid : [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], // ibeacon uuid
  major : 0x0001, // optional
  minor : 0x0001, // optional
  rssi : -59 // optional RSSI at 1 meter distance in dBm
});

Perhaps you have a better idea how to pass the Uint8Array to the NRF.setAdvertising function.

An own iBeacon module would be great and definitely add value also for other users.

Changeable input parameters for an iBeacon module would be:

1. UUID => Bytes 9 - 24
   
2. Major: integer value between 0 and 65535 => Bytes 25 - 26
   
3. Minor: integer value between 0 and 65535 => Bytes 27- 28
   
4. Calibrated TX Power: integer value between 0 and 255 => Byte 29
   

Thanks Gordon, for your fast reply.

I also tried to just use the middle part of the example, but didn't realize that I have to change the flags. Your code above works perfectly!

Thanks again, for your help.

Has anyone already managed to turn Puck.js into an Apple iBeacon?

So far, I used these information from Stackoverflow:
http://stackoverflow.com/questions/18906988/what-is-the-ibeacon-bluetooth-profile
and the NRF.setAdvertising function to test with the following code:

var g = [0xd6, 0xbe, 0x89, 0x8e, 0x40, 0x24, 0x05, 0xa2, 0x17, 0x6e, 0x3d, 0x71, 0x02, 0x01, 0x1a, 0x1a, 0xff, 0x4c, 0x00, 0x02, 0x15, 0xe2, 0xc5, 0x6d, 0xb5, 0xdf, 0xfb, 0x48, 0xd2, 0xb0, 0x60, 0xd0, 0xf5, 0xa7, 0x10, 0x96, 0xe0, 0x00, 0x00, 0x00, 0x00, 0xc5, 0x52, 0xab, 0x8d, 0x38, 0xa5];
NRF.setAdvertising(g);

When sending the code to Puck.js, I get the following error message:

Uncaught Error: Got BLE error code 9
 at line 1 col 21
NRF.setAdvertising(g);
                    ^
=undefined

Any ideas? Thanks in advance!