#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8); // RX, TX

int node_id  =  2; // node id
int ledPin   =  9; // LED pin number
int ledGND   = 10; // For OutputDevice only, LED cathode is connected to D10
int incoming =  0; // for incoming serial data

void setup() {
  mySerial.begin(9600);
  mySerial.setTimeout(10);  // Set Timout for separated numbers
  pinMode(ledPin, OUTPUT);
  pinMode(ledGND, OUTPUT);
  digitalWrite(ledGND, LOW);  
}

void loop() {
  // check if data is available
  if (mySerial.available() > 0) {
    // read the incoming data
    incoming = mySerial.parseInt();
    
  // say what you got for debugging
  //    mySerial.print("I received: ");
  //    mySerial.println(incoming);
  }

  // check if incoming data is for me
  // if so and data ends with '1' turn LED ON, when data ends with '0' turn LED OFF
  if (incoming == node_id * 10 + 1) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);

  } else if (incoming == node_id * 10){
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
}