title: What is bluetooth le multi advertising?
body: <p>I couldn't find a clear explanation what  is Bluetooth le multi advertising.</p>
  
  <p>For example, in Specification of the Bluetooth System, I see only 
  description of BLE advertising but not multi advertising.</p>
  
  <p>What the difference between BLE advertising and multi advertising?</p>
  
  <p>Thanks</p>