#include <SoftwareSerial.h>

#define RXPIN 1
#define TXPIN 0

SoftwareSerial TRSerial(0,1);

void setup() {
  Serial.begin(9600);
  TRSerial.begin(9600);
}

void loop() {
  int incomingByte = 0;
  if (Serial.available() > 0) {
    incomingByte = Serial.read();
    TRSerial.write(incomingByte);    
  }
  if (TRSerial.available() > 0) {
    incomingByte = TRSerial.read();
    Serial.write(incomingByte);    
  }
  delay(5);
}