#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

#define CE_PIN   0
#define CSN_PIN 17

const byte thisSlaveAddress[5] = {'R','x','A','A','A'};

RF24 radio(CE_PIN, CSN_PIN);

char dataReceived = '0';
bool newData = false;

unsigned long currentMillis = 0;
unsigned long prevMillis = 0;
unsigned long txIntervalMillis = 1000; // send once per second


//===========

void setup() {
    pinMode(28, OUTPUT);
    Serial.begin(9600);
    if (!radio.begin()) {
      while (true) {
        Serial.println("FUCK");
      }
    }
    Serial.println("SimpleRx Starting");
    radio.setPALevel(RF24_PA_HIGH);
    radio.setDataRate( RF24_250KBPS );
    // radio.setChannel(49);
    radio.enableAckPayload();
    radio.openReadingPipe(1, thisSlaveAddress);
    radio.startListening();
}

//=============

void loop() {
    if (dataReceived == '1') {
      digitalWrite(28, HIGH);
    } else if (dataReceived == '0') {
      digitalWrite(28, LOW);
    }
    getData();
    showData();

    currentMillis = millis();
    if (currentMillis - prevMillis >= txIntervalMillis) {
        Serial.println("A second has passed");
        prevMillis = millis();
    }

}

//==============

void getData() {
    if ( radio.available() ) {
        radio.read( &dataReceived, sizeof(dataReceived) );
        newData = true;
    }
}

void showData() {
    if (newData == true) {
        Serial.print("Data received ");
        Serial.println(dataReceived);
        newData = false;
    }
}