MSP430-RF2500 reading a packet problem

Hello my name is Kostas and I want to ask you a question regarding the MSP430 eZ430-RF2500 development tool.
I'm trying to send a packet, by pressing the button on the board, containing the letter "A" from one board to another. When the packet is received I want it to check if it contains the letter and if it does, to turn on the red light on the board. The problem is that I cannot read the contents of the packet thus, I cannot perform the check. Below is the code that I'm using to perform this task. What should I do to fix this problem?
Thanks in advance.

#include "mrfi.h"
#include "radios/family1/mrfi_spi.h"

int main()
{
BSP_Init();
P1REN |= 0x04;
P1IE |= 0x04;
MRFI_Init();
MRFI_WakeUp();
MRFI_RxOn();
__bis_SR_register(GIE+LPM4_bits);
}

void MRFI_RxCompleteISR()
{
mrfiPacket_t packet;
MRFI_Receive(&packet);
if (packet.frame[0]=='A'){
P1OUT ^= 0x02;
}
}

#pragma vector=PORT1_VECTOR

__interrupt void Port_1()
{
P1IFG &= ~0x04;
char rx='A';
mrfiPacket_t packet;
packet.frame[0]=rx;
MRFI_Transmit(&packet, MRFI_TX_TYPE_FORCED);
P1OUT ^= 0x01;
}