Remote output XBee

sketch.ino

int ledPin = 13;
int buttonPin = 2;

boolean flag = LOW;
boolean buttonState;
boolean lastButtonState = LOW;
int lastDebounceTime = 0;
int debounceDelay = 50;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  digitalWrite(buttonPin, HIGH);
  Serial.begin(9600);
}
void loop() {
  boolean reading = digitalRead(buttonPin);
  if(reading != lastButtonState){
    lastDebounceTime = millis();
  }
  
  if((millis() - lastDebounceTime) > debounceDelay){
    if(reading != buttonState){A
      buttonState = reading;
      
      if(buttonState == LOW){
        flag = !flag;
        if(flag){
          setRemoteState(0x5);
        }else{
          setRemoteState(0x4);
        }  
      }
    }
  }
  digitalWrite(ledPin, flag);
  lastButtonState = reading;
  
  
//  digitalWrite(ledPin, HIGH);
//  setRemoteState(0x5);
//  delay(2000);
//  digitalWrite(ledPin, LOW);
//  setRemoteState(0x4);
//  delay(3000);
}
void setRemoteState(char value) {
  Serial.write(0x7E); //start byte
  Serial.write((byte)0x0);
  Serial.write(0x10);
  Serial.write(0x17); // remote AT command
  Serial.write((byte)0x0);
  Serial.write((byte)0x0);
  Serial.write((byte)0x0);
  Serial.write((byte)0x0);
  Serial.write((byte)0x0);
  Serial.write((byte)0x0);
  Serial.write((byte)0x0);
  Serial.write(0xFF);
  Serial.write(0xFF);
  Serial.write(0xFF);
  Serial.write(0xFE);
  Serial.write(0x02);
  Serial.write('D'); // command 'D3'
  Serial.write('3');
  Serial.write(value); // 4-OFF or 5-ON
  long sum = 0x17 + 0xFF + 0xFF + 0xFF + 0xFE + 0x02 + 'D' +
  '3' + value;
  Serial.write(0xFF - (sum & 0xFF)); //checksu
}