Remote Control Car Using Bolt IoT Kit

#include <BoltIoT-Arduino-Helper.h> //Include the bolt library file for easy access to the bolt commands.

#include <AFMotor.h>   //library file included to control the motors with L293D morto driver shiled.

AF_DCMotor motor1(1, MOTOR12_64KHZ);
AF_DCMotor motor2(2, MOTOR12_64KHZ);  //Setting the frequency of the motors to operate on.

void forward() { //function created to move the car forward.
   motor1.run(FORWARD);
    motor2.run(FORWARD);
}

void backward() {  //function created to move the car backward.
   motor1.run(BACKWARD);
      motor2.run(BACKWARD);
}

void right() {   //function created to move the car in Right direction.
   motor1.run(FORWARD);
      motor2.run(BACKWARD);
}

void left() {   //function created to move the car in left direction.
   motor1.run(BACKWARD);
      motor2.run(FORWARD);
}

void stopcar() {  //function created to stop the car.
    motor1.run(RELEASE);
         motor2.run(RELEASE);
}

void setup() {
  // setup code, to run once:
  motor1.setSpeed(200);
  motor2.setSpeed(200);
  boltiot.begin(Serial);
  Serial.begin(9600);
}

void loop() {
  // main code here, to run repeatedly:
  boltiot.handleCommand();
String val="";
if(Serial.available()>0){  //to read inputs sent from the bolt Cloud server.
  val=Serial.readString();
  Serial.print(val);
//perfrom or call the functions as per the command received from the bolt.
  if(val=="F")   
  forward();
  if(val=="D")
  backward();
  if(val=="L")
  left();
  if(val=="R")
  right();
  if(val=="S")
  stopcar();
}
}