BangleApps/apps/boot/boot0.js

// This ALWAYS runs at boot
E.setFlags({pretokenise:1});
// Load settings...
var s = require('Storage').readJSON('setting.json',1)||{};
if (s.ble!==false) {
  if (s.HID) { // Human interface device
    Bangle.HID = E.toUint8Array(atob("BQEJBqEBhQIFBxngKecVACUBdQGVCIEClQF1CIEBlQV1AQUIGQEpBZEClQF1A5EBlQZ1CBUAJXMFBxkAKXOBAAkFFQAm/wB1CJUCsQLABQwJAaEBhQEVACUBdQGVAQm1gQIJtoECCbeBAgm4gQIJzYECCeKBAgnpgQIJ6oECwA=="));
    NRF.setServices({}, {uart:true, hid:Bangle.HID});
  }
}
if (s.blerepl===false) { // If not programmable, force terminal off Bluetooth
  if (s.log) Terminal.setConsole(true); // if showing debug, force REPL onto terminal
  else E.setConsole(null,{force:true}); // on new (2v05+) firmware we have E.setConsole which allows a 'null' console
} else {
  if (s.log && !NRF.getSecurityStatus().connected) Terminal.setConsole(); // if showing debug, put REPL on terminal (until connection)
  else Bluetooth.setConsole(true); // else if no debug, force REPL to Bluetooth
}
// we just reset, so BLE should be on.
// Don't disconnect if something is already connected to us
if (s.ble===false && !NRF.getSecurityStatus().connected) NRF.sleep();
// Set time, vibrate, beep, etc
if (!s.vibrate) Bangle.buzz=Promise.resolve;
if (s.beep===false) Bangle.beep=Promise.resolve;
else if (s.beep=="vib") Bangle.beep = function (time, freq) {
  return new Promise(function(resolve) {
    if ((0|freq)<=0) freq=4000;
    if ((0|time)<=0) time=200;
    if (time>5000) time=5000;
    analogWrite(D13,0.1,{freq:freq});
    setTimeout(function() {
      digitalWrite(D13,0);
      resolve();
    }, time);
  });
};
Bangle.setLCDTimeout(s.timeout);
if (!s.timeout) Bangle.setLCDPower(1);
E.setTimeZone(s.timezone);
delete s;
// stop users doing bad things!
global.save = function() { throw new Error("You can't use save() on Bangle.js without overwriting the bootloader!"); }
// check for alarms
var alarms = require('Storage').readJSON('alarm.json',1)||[];
var time = new Date();
var active = alarms.filter(a=>a.on&&(a.last!=time.getDate()));
if (active.length) {
  active = active.sort((a,b)=>a.hr-b.hr);
  var hr = time.getHours()+(time.getMinutes()/60)+(time.getSeconds()/3600);
  if (!require('Storage').read("alarm.js")) {
    console.log("No alarm app!");
    require('Storage').write('alarm.json',"[]")
  } else {
    var t = 3600000*(active[0].hr-hr);
    if (t<1000) t=1000;
    /* execute alarm at the correct time. We avoid execing immediately
    since this code will get called AGAIN when alarm.js is loaded. alarm.js
    will then clearInterval() to get rid of this call so it can proceed
    normally. */
    setTimeout(function() {
      load("alarm.js");
    },t);
  }
}