HC-05 :

I have used HC-05 Bluetooth module to control the rover's movements. HC-05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup.

It works with MASTER/SLAVE application. By default the factory setting is SLAVE.The Role of the module (Master or Slave) can be configured only by AT COMMANDS.The slave modules cannot initiate a connection to another Bluetooth device, but can accept connections.Master module can initiate a connection to other devices.

Controlling remotely with HC-05 :

Directional movement of the rover is controlled using an RC Controller application that is coupled through Bluetooth to the Bluetooth module HC-05.

You can download that application from the Google Play Store from this link.

 The controller used is an Arduino Nano which is programmed as required.