title: In Bluetooth LE, both GATT server and GATT client advertise before the connection is established?
body: <p>I am new to Bluetooth LE and working on a device from CSR,</p>
  
  <ol>
  <li>Plan is to create a GATT client and GATT server.</li>
  <li>Where GATT server can send data to GATT client using notifications.</li>
  <li>But here, we want both server as well as client to be micro controller based BT LE devices.</li>
  </ol>
  
  <p>Also, one more doubt is when GATT sever has data, is it the responsibility of the programmer to create and send a notification or is there some way that the notification is send automatically on updating the attribute.</p>
  
  <p>Please provide if there is any example code available for this.</p>