#include <SoftwareSerial.h>
SoftwareSerial mySerial(PA1,PA0); //RX, TX
int v=3;
int nodeid=1;

void setup() {
  mySerial.begin(9600);
  pinMode(3, OUTPUT); // led
}

void loop() {
  digitalWrite(3,LOW);
  v = 3; 
  while (mySerial.available () == 0 ) {}
  v = mySerial.parseInt();
  mySerial.println(v);
  if(v == nodeid)
  {
    digitalWrite(3,HIGH);
    delay(1000);
  }
  else
  {
    digitalWrite(3,LOW);
   }
}