Example code for getting Eddystone, iBeacon, or both advertising on a Puck.JS. Turns on/off with the button, and displays battery level too :)

puck.js eddystone-ibeacon-example.js

// Eddystone and iBeacon example code for Puck.js 1.92 or above
// How to use: paste into the web IDE, adjust to your needs, and upload to your puck.

// Setup which type of advertising you wish to make, Eddystone, iBeacon, or both. Uncomment ONLY ONE.
function doAdvertising() {
  doEddystone(); //By default, we advertise eddystone only.
  //doiBeacon();
  //advertiseBoth();
}

// This function advertises Eddystone ONLY
// Please read https://www.espruino.com/Puck.js+Eddystone for guidelines on correct URLs.
function doEddystone(){
  require("ble_eddystone").advertise("goo.gl/B3J0Oc"); //set url here
}

// This function advertising iBeacon ONLY
// Please read https://www.espruino.com/Puck.js+iBeacon for further details.
function doiBeacon(){
  require("ble_ibeacon").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
  });
}

// This function advertises both Eddystone and iBeacon
function advertiseBoth() {  //For advertising both Eddystone and iBeacon at the same time!
  NRF.setAdvertising([
  require("ble_ibeacon").get("goo.gl/B3J0Oc"), //set url here
  require("ble_eddystone").get({
    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
  })], {interval:100});
}

// Upon button press, we do something. All other times, we sleep, This is an interrupt.
// Note in sleep, NRF is awake and advertising, but JS is not executing, until the button interrupts sleep.
// In sleep and not advertising, 12uA power is used.
// In sleep and advertising at 375ms (0dBm), 25uA power is used.
setWatch(function() {
  digitalPulse(LED1,1,100);
  digitalPulse(LED3,1,100);  // Blink Purple when the button is pressed
  setTimeout(function () {   // Then, show our battery status as a red through to green for low to high.
    batteryLED();
  }, 500);
  setTimeout(function () {
    toggleAdvertising();     // Finally, toggle eddystone advertising On/Off - blue blink for adv on, red for adv off
  }, 500);
}, BTN, {edge:"rising", debounce:50, repeat:true});

function blinkRed(time) {
  digitalPulse(LED1,1,time);
}
function blinkGreen(time) {
  digitalPulse(LED2,1,time);
}
function blinkBlue(time) {
  digitalPulse(LED3,1,time);
}
function blinkYellow(time) { // It seems to multiplex these - even though espruino is single-threaded
  digitalPulse(LED1,1,time);
  digitalPulse(LED2,1,time);
}

// This function blinks the LEDs depending on battery status.
// Puck.getBatteryPercentage is the nicer way to check your battery status
// For the curious: NRF.getBattery() will give you raw voltage read from the NRF IC.
function batteryLED(){
  blvl=Puck.getBatteryPercentage();
  if (blvl >= 75) {                // If battery is above 75%, blink green
    blinkGreen(100);
  }
  if (blvl < 75 && blvl > 25 ) {   // If battery is lower than 75%, blink yellow
    blinkYellow(100);
  }
  if (blvl < 25) {                 // If battery is lower than 25%, blink red!
    blinkRed(100);
  }
}

//This function toggles whether advertising is on or off.
var adv = false;
function toggleAdvertising() {
  adv = !adv;
  if ( adv === true ) {
    // Enable Advertising, blink blue LED to reflect this.
    setTimeout(function () {
      blinkBlue(500);
    }, 400);
    doAdvertising(); //Call doAdvertising function at top
  } else {
    //Disable Advertising, blink red LED to reflect this.
    setTimeout(function () {
      blinkRed(500);
    }, 400);
    NRF.setAdvertising({}); //Cancel all advertising.
  }
}