title: Send string from one ble device to another
body: <p>i have two raspberry pi's with ble 4.0 dongles.
  i compiled blue-5.9 on the raspberrys.
  Everything works fine with TI's Sensortag.</p>
  
  <p>next, i would like to connect both devices via BLE and send a string from one to the other.</p>
  
  <p>i'm pretty lost with all i found online. </p>
  
  <p>do you have any link or short example for me?</p>