Made with Arduino tools allows control by bluetooth.

In my personal website (Mustafa KARSLI .com) "Arduino Bluetooth Controlled Car Production" describes.

In practice the commands:
Next: y
Back: a
Left: s
Right: p
Right forward diagonal: k
Left forward diagonally m
Right backcross f
Sol fer cross z
Stop: D
Speed ​​1: 1
Speed ​​2: 2
Speed ​​3: 3