const int ledPin = 2; 
const int rxPin = 1;
const int txPin = 0;
int incomingByte = 0;

void setup() {
  // put your setup code here, to run once:
  #define node_id '1'
  pinMode(ledPin, OUTPUT);
  pinMode(txPin,INPUT);
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();
    }
    // say what you got:
    if (incomingByte == node_id) {
      digitalWrite(ledPin, HIGH);
      pinMode(txPin,OUTPUT);
      digitalWrite(txPin, HIGH);
      Serial.print("node:");
      Serial.println(node_id);
      delay(1000); 
      digitalWrite(ledPin, LOW);
      pinMode(txPin,INPUT);
    }

}