BARELY WORKING - master

#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" };

char receivedData[32];
char data1[32];

int j = 33;

// -----------------------------------------------------------------------------
// SETUP   SETUP   SETUP   SETUP   SETUP   SETUP   SETUP   SETUP   SETUP
// -----------------------------------------------------------------------------
void setup() {
	Serial.begin(9600);
	Serial.println("THIS IS THE TRANSMITTER CODE - YOU NEED THE OTHER ARDIUNO TO SEND BACK A RESPONSE");

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

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

	// Set the speed of the transmission to the quickest available
	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[1]);
	radio.openReadingPipe(1, addresses[0]);

	// Random number seeding (we're going to be sending a single random number)
	randomSeed(analogRead(A0));
}

// -----------------------------------------------------------------------------
// LOOP     LOOP     LOOP     LOOP     LOOP     LOOP     LOOP     LOOP     LOOP
// -----------------------------------------------------------------------------
void loop() {

	// Generate a single random character to transmit
	char data = 'a';



	// Ensure we have stopped listening (even if we're not) or we won't be able to transmit
	radio.stopListening();

	// Did we manage to SUCCESSFULLY transmit that (by getting an acknowledgement back from the other Arduino)?
	// Even we didn't we'll continue with the sketch, you never know, the radio fairies may help us

	/*
	if (!radio.write(&data1, sizeof(data1))) {
		// Serial.println("No acknowledgement of transmission - receiving radio device connected?");
	}
	*/

	String neki = "datatosend";

	neki.toCharArray(data1, 32);

	if (!radio.write(&data1, sizeof(data1))) {
		// Serial.println("No acknowledgement of transmission - receiving radio device connected?");
	}

	// Now listen for a response
	radio.startListening();

	// But we won't listen for long, 200 milliseconds is enough
	unsigned long started_waiting_at = millis();

	// Loop here until we get indication that some data is ready for us to read (or we time out)

	while (!radio.available()) {

		// Oh dear, no response received within our timescale
		if (millis() - started_waiting_at > 200) {
			Serial.println("No response received - timeout!");
			return;
		}
	}
	j++;


	// Now read the data that is waiting for us in the nRF24L01's buffer
	unsigned char dataRx;
	radio.read(&receivedData, sizeof(receivedData));

	// Show user what we sent and what we got back
	Serial.print("Sent: ");
	Serial.print(j);
	Serial.print(", received: ");
	Serial.println(receivedData);

	if (j > 129) j = 33;

		// Try again 1s later
	delay(500);

	}