title: Automate Bluetooth Pairing/Trusting in Bluez5
body: <p>I've been working on making my RPi 2 function like a car bluetooth receiver and all is well, except I have no idea how I could automate the pairing of bluetooth devices in Bluez5. In the past I would've used the bluetooth agent and a simple script, but that seems to have gone out the window with the move from 4 -> 5. The nature of the setup means I have no kb/mouse on the RPi once its in the car, so it needs to be a fully automated setup where anyone can scan for the RPi, and if the probably hard-coded PIN is correct, the trusting of the device needs to be automatically done, no cli input.</p>
  
  <p>I've searched all over the web but everyone seems to say that using bluetoothctl works for them, but in this particular setup where I'd like to be able to have friends pair their own phones, having to trust devices with the RPi out of the car isn't ideal. </p>