HC-06 data receiving

SoftwareSerial mySerial(10, 11); // RX, TX
char buf[2];
int i=0;
int data;
int ledPin = 9;

void setup() {
    pinMode(ledPin, OUTPUT);
  // Open serial communications and wait for port to open:
  Serial.begin(57600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  mySerial.begin(9600);
}

void loop() { // run over and over
  if (mySerial.available()) {
    for(;i<2; ){
      buf[I] = mySerial.read();
      i++;
    }
    i = 0;
    Serial.print(buf);
    data = atoi(buf);
  }

    analogWrite(ledPin, data/10); //To see how code behaves on LED
}