// RX ET

#include <EasyTransfer.h>

EasyTransfer ET;

struct RECEIVE_DATA_STRUCTURE{
  int buttonState;
};

RECEIVE_DATA_STRUCTURE mydata;

int greenLed = 46;
int yellowLed = 44;
int redLed = 42;

//-- TIMING

long previousMillis = 0;
long interval = 500;
unsigned long currentMillis;

void setup() {
  pinMode(greenLed, OUTPUT);
  pinMode(redLed, OUTPUT);
  pinMode(yellowLed, OUTPUT);

  Serial.begin(9600);
  ET.begin(details(mydata), &Serial);
}

void loop()
{
  currentMillis = millis();
  if(ET.receiveData())
  {
      digitalWrite(yellowLed, HIGH);
      previousMillis = currentMillis;

      digitalWrite(greenLed, mydata.buttonState);
  }
  else
  {
    digitalWrite(yellowLed, LOW);
  }
  if(currentMillis - previousMillis > interval) {

    //-- No signal for 500ms, STOP!

    digitalWrite(redLed, HIGH);
  }
  else
  {
    digitalWrite(redLed, LOW);
  }
}