NRF24L01 - RECEIVER

#include "Arduino.h"
#include <SPI.h>
#include <RF24.h>

// This is just the way the RF24 library works:
// Hardware configuration: Set up nRF24L01 radio on SPI bus (pins 10, 11, 12, 13) plus pins 7 & 8
RF24 radio(7, 8);

byte addresses[][6] = { "1Node", "2Node" };

// -----------------------------------------------------------------------------
// SETUP   SETUP   SETUP   SETUP   SETUP   SETUP   SETUP   SETUP   SETUP
// -----------------------------------------------------------------------------
void setup() {
	Serial.begin(9600);
	Serial.println("THIS IS THE RECEIVER CODE - YOU NEED THE OTHER ARDUINO TO TRANSMIT");

	// Initiate the radio object
	radio.begin();

	// Set the transmit power to lowest available to prevent power supply related issues
	radio.setPALevel(RF24_PA_LOW);
	// radio.setPALevel(RF24_PA_MIN);

	// Set the speed of the transmission to the quickest available
	radio.setDataRate(RF24_250KBPS);
	// radio.setDataRate(RF24_2MBPS);

	// Use a channel unlikely to be used by Wifi, Microwave ovens etc
	radio.setChannel(124);

	// Open a writing and reading pipe on each radio, with opposite addresses
	radio.openWritingPipe(addresses[0]);
	radio.openReadingPipe(1, addresses[1]);

	// Start the radio listening for data
	radio.startListening();
}

// -----------------------------------------------------------------------------
// We are LISTENING on this device only (although we do transmit a response)
// -----------------------------------------------------------------------------
void loop() {

	// This is what we receive from the other device (the transmitter)
	unsigned char data;

	// Is there any data for us to get?
	if (radio.available()) {

		/*
		// Go and read the data and put it into that variable
		while (radio.available()) {
			radio.read(&data, sizeof(char));
		}
		*/

		char preberi[32];

		while(radio.available()) {
			radio.read(&preberi, sizeof(preberi));
		}
		// No more data to get so send it back but add 1 first just for kicks
		// First, stop listening so we can talk
		radio.stopListening();

		/*
		data++;
		radio.write(&data, sizeof(char));
		*/

		preberi[5] = '0';

		radio.write(&preberi, sizeof(preberi));

		// Now, resume listening so we catch the next packets.
		radio.startListening();

		// Tell the user what we sent back (the random numer + 1)
		Serial.print("Sent response ");
		// Serial.println(data);
		Serial.println(preberi);
	}
}