#include <SoftwareSerial.h>
SoftwareSerial mySerial(PB2, PB0);

char node = '2';

void setup() 
{
  mySerial.begin(9600);
  pinMode(PB3, OUTPUT);           // Turn on LED when program starts
  digitalWrite(PB3,LOW);
}

void flash()
{
  digitalWrite(PB3,1); 
  delay(500);
  digitalWrite(PB3,0); 
}


void loop() 
{
  if (mySerial.available()) 
  {
    char i = mySerial.read();
    if(i==node)
    {
      mySerial.print("Node 2");
      flash();
    }
  }
}