UART To receive Multibyte is not working.

Hello I'm working on a bluetooth to MCU interface project to receive a stream of bytes and act accordingly  ( like switching on a Relay or so on ) on a msp-exp430g2 with a msp430g2553 ic.

I'm able to receive buff_rxTemp[1],buff_rxTemp[2] but all other values are junk.Other thing that I noticed is that buff_rxCnt jumps to 52 quite consistently from 2 and never counts to 3 to 52.Therefore values between 3 and 52 are always '\0'.

Is there any problem with my code.

#include <msp430.h> 

/*
 * main.c
 */

unsigned char buff_rxTemp[];
unsigned char buff_rx[];
unsigned int buff_rxCnt=0;
unsigned int i;

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;	// Stop watchdog timer

    P1DIR |=BIT6;
    P1OUT &=BIT6;
    P1DIR |=BIT0;
    P1OUT &=BIT0;

    DCOCTL = 0; // Select lowest DCOx and MODx settings<
    BCSCTL1 = CALBC1_1MHZ; // Set DCO
    DCOCTL = CALDCO_1MHZ;

    P1SEL= 		BIT1 + BIT2	;
    P1SEL2= 	BIT1 +BIT2;
    UCA0CTL1|=  UCSSEL_2;
    UCA0BR0=	104;
    UCA0BR1=	0;
    UCA0MCTL= 	UCBRF_0 + UCBRS_1 ;
    UCA0CTL1&=	~UCSWRST;
    IE2|= 		UCA0RXIE;

    __bis_SR_register(CPUOFF + GIE); // Enter LPM0 w/ int until Byte RXed


    while(1){

    }

}
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)	{
		buff_rxTemp[i]= UCA0RXBUF;
		i++;
}