#include <SoftwareSerial.h>
SoftwareSerial mySerial(PA1,PA0); //RX, TX
int v=0; 
int nodeid=1;

void setup() {
  mySerial.begin(9600); 
  pinMode(PA3, OUTPUT); // white led
}

void loop() {
  while (mySerial.available () == 0 ) {}
  v = mySerial.parseInt();
  mySerial.println(v);
  if(v == nodeid)
{
  digitalWrite(PA3,HIGH);
}
else
{
  digitalWrite(PA3,LOW);
 }
}