title: Questions regarding BLE advertise and broadcast
body: <p>What I have read from many documents of Android Developer and lectures that I searched on the internet is: Advertising is sending signals to a broadcasting device so that the device could be found and Broadcasting is scanning the advertising devices to connect/send data.</p>
  <p>Is what I understood correct?</p>
  <p>Then is it true that BluetoothLeAdvertiser should be implemented first before scanning activity?</p>
  <p>I am keep researching on the internet to find information in order to create an app that can broadcast a short word to other nearby devices through BLE.
  However, when I was doing research people do not use class LeAdvertiser that was introduced as an example on Android Developer page. Why is it??</p>