function simulateMouseEvents(element, eventName) {
  var mouseEvent = document.createEvent("MouseEvents");
  mouseEvent.initEvent(eventName, true, true);
  element.dispatchEvent(mouseEvent);
}

/*
Schedule your message section starts here 
var now = new Date(); 

// Replace Hours, Mins and secs with your 
// desired time in 24 hour time format e.g. 
// var rt = new Date(now.getFullYear(), now.getMonth(), 
// now.getDate(), Hours, Minutes, Sec, 0) - now; 
// to send message at 2.30PM 
var rt = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 14, 30, 00, 0) - now; 

if (rt < 0) { 
	rt += 86400000; 
} 

setTimeout(startTimer, rt); 
Schedule your message section ends here
*/

// Replace My Contact Name with the name
// of your WhatsApp contact or group e.g. title="Sachu Verma"
name = "My Contact";

simulateMouseEvents(
  document.querySelector('[title="' + name + '"]'),
  "mousedown"
);

function startTimer() {
  setTimeout(myFunc, 3000);
}

startTimer();

var eventFire = (MyElement, ElementType) => {
  var MyEvent = document.createEvent("MouseEvents");
  MyEvent.initMouseEvent(
    ElementType,
    true,
    true,
    window,
    0,
    0,
    0,
    0,
    0,
    false,
    false,
    false,
    false,
    0,
    null
  );
  MyElement.dispatchEvent(MyEvent);
};

function myFunc() {
  messageBox = document.querySelectorAll("[contenteditable='true']")[1];

  message = "My Message"; // Replace My Message with your message use  to add spaces to your message
  counter = 1; // Replace 5 with the number of times you want to send your message

  for (i = 0; i < counter; i++) {
    event = document.createEvent("UIEvents");
    messageBox.innerHTML = message.replace(/ /gm, ""); // test it
    event.initUIEvent("input", true, true, window, 1);
    messageBox.dispatchEvent(event);
    eventFire(document.querySelector('span[data-icon="send"]'), "click");
  }
}