Relay ON/OFF with Smart phone app

gistfile1.ino

void setup() {
  // Open serial communications:
  Serial.begin(9600);
  pinMode(2, OUTPUT); 
  

  // send an intro:
  Serial.println("Enter a value");
  Serial.println();
}

void loop() {
  // get any incoming bytes:
  if (Serial.available() > 0) {
    int thisChar = Serial.read();

    // say what was sent:
    Serial.print("You sent me: \'");
    Serial.write(thisChar);
    if (thisChar=='h')
    {
     
    digitalWrite(2, HIGH); 
    }
    else {
    digitalWrite(2, LOW);
    }
    Serial.print("\'  ASCII Value: ");
    Serial.println(thisChar);

     Serial.println();
    Serial.println("Give me another byte:");
    Serial.println();
  }
}