title: Enable Notification/Indication BLE (ua-651) GATTTOOL
body: <p>I'm trying to get Blood Presure datas from the UA-651-BLE from A&amp;D.</p>
  
  <p>Firstly, before developping a C++ Application with Qt, I'm trying to do this work thanks to Gatttool.
  The device is pair, I can connect my computer in aim to read values.</p>
  
  <p>But if I think good, to read blood presure datas, I need to allow indications &amp; notifications.
  How can I do that ?</p>
  
  <p>Thanks a lot for your replies, I really need help !</p>