title: Android app, receiving data over BLE Module sent by Microcontroller via UART
body: <p>I want to create android app, which can connect with bluetooth low energy module and can receive data. In my system microcontroller <code>stm32f1</code> send data of measurements over <code>UART</code> to the BT LE module.</p>
  
  <p>My question is how to start? I read a lot about <code>GATT</code> and <code>UART</code> Service, but still don't know how to start. Give me some information please.</p>