#include <SoftwareSerial.h>
#define rxPin D2     // recieves signal from bridge 
#define txPin D3     // transmit signal to the bridge
#define LED 0

SoftwareSerial mySerial(rxPin, txPin);

const int node = 2; // bus address
char incomingByte;
int user = 0;

void setup() {
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
  Serial.begin(9600);
    while (!Serial) {}
  mySerial.begin(9600);

}

void loop() {

 if (mySerial.available()) {
       incomingByte = mySerial.read();
       user = incomingByte;
   Serial.println(user);
         
   if (user == node) {

   //   pinMode(txPin, OUTPUT);

      mySerial.write(node);

  //    pinMode(txPin, INPUT);

    digitalWrite(LED, HIGH); // turn on LED
    delay(400);
    digitalWrite(LED, LOW);  // turn off LED

  }
 }
}