unable to make a simple BLE ....

just for the test I want to test this Hex (Got this from https://www.bluetooth.com/specifications­/gatt/characteristics/)

The issue is that's a characteristic, not a standard service that is used with advertising. It's still broadcasting the data (as a 2 character string), it's just not being interpreted by the app.

if I want to make 1 min for website1 and 2 min for website 2?

Then you need to call setAdvertising every time you need to change it. Specifying 2 lines will advertise two websites at once.

function changeWebsite(url) {
NRF.setAdvertising([
require("ble_eddystone").get(url),
{
//this part is all the data I want to show using Hex , 
// can take examples from here https://www.bluetooth.com/specifications­/gatt/characteristics/ - //right?
   0x180F : [NRF.getBattery()],
   0x1809 : [Math.round(E.getTemperature())]
  } 
],
//this is the default setting I can cahnge - right ? this is the only setting I can change from here 
{
   name  : "David",
   showName: true,
   discoverable : true,
   connectable : false,
   scannable : true,
   interval:100
});
}


setInterval(function() {
  // every 3 minutes...
  changeWebsite("http://www.david1.com");
  // 2 minute later
  setTimeout(function() {
    changeWebsite("http://www.Danny1.com");
  }, 60000);
}, 3*60000); // 3 minutes

the battery shown 3%

It's because NRF.getBattery() is returning a voltage (that of the voltage regulator) which is 3.3v. It gets converted to in integer, which is 3.

The module can't directly measure the voltage on V+, you need to make a potential divider for that and connect it to an analog input - there are a few examples on the forum.