Use USB-cable to connet PS3 joystick
or do Bluetooth-pairing, following:
  https://pimylifeup.com/raspberry-pi-playstation-controllers/
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 1. Plug in controller with USB
 2. sudo ~/sixpair/sixpair
    Note Bluetooth address

 3. Unplug controller
 4. sudo bluetoothctl
	agent on
	default-agent
	scan on
 5. Press PS3 button on game controller, 4 LEDs blinking
 6. Find correct MAC address in list
 7. connect <mac_addr>
 8. trust <mac_addr>
 9. quit
10. sudo reboot now
11. Game controller should now work via Bluetooth
    and hoave only 1 LED solid on.
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