DDD

MASTER
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#define F_CPU 16000000UL
#include "master.h"

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include <util/delay.h>
#include "nRF905/nRF905.h"

#define RXADDR {0x58, 0x6F, 0x2E, 0x10} // Address of this device (4 bytes)
#define TXADDR {0xFE, 0x4C, 0xA6, 0xE5} // Address of device to send to (4 bytes)

int main(void)
{
	// LED indicator
	//config led
	DDRC |= _BV(DDC5);

	// Start up
	nRF905_init();

	// Set address of this device
	uint8_t addrRx[] = RXADDR;
	nRF905_setRXAddress(addrRx);

	// Set address of device to send to
	uint8_t addr[] = TXADDR;
	nRF905_setTXAddress(addr);

	// Interrupts on
	sei();

	// Make buffer for data
	char mesaj[NRF905_MAX_PAYLOAD] = "test test";


	//on
	PORTC |= _BV(PORTC5);

	while(1)
	{
		nRF905_setData(mesaj, sizeof(mesaj));
		while(!nRF905_send());
	}
}

==========================================================================
SLAVE
==========================================================================
#define F_CPU 16000000UL
#include "slave.h"

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include <util/delay.h>
#include "nRF905/nRF905.h"
#include "UART.h"

#define RXADDR {0xFE, 0x4C, 0xA6, 0xE5} // Address of this device (4 bytes)
#define TXADDR {0x58, 0x6F, 0x2E, 0x10} // Address of device to send to (4 bytes)

int main(void)
{
	// LED indicator
	//config led
	DDRC |= _BV(DDC5);

	UART_init();
	nRF905_init();

	// Set address of this device
	uint8_t addrRx[] = RXADDR;
	nRF905_setRXAddress(addrRx);

	// Interrupts on
	sei();

	// Put into receive mode
	nRF905_receive();

	uint8_t mesaj[NRF905_MAX_PAYLOAD];

	UART_sendstring("start\r" , '\r');

	//on
	PORTC |= _BV(PORTC5);

	// Wait for data
	while(!nRF905_getData(mesaj, sizeof(mesaj)));
	UART_sendstring("ok\r" , '\r');
	//off
	PORTC &= ~_BV(PORTC5);

	UART_sendstring(mesaj , '\r');
}

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all UART stuff is a library that is fully working