converter Data to String

uint8_t *receivecData = (uint8_t*)[data bytes];
 
    NSString *receivecStr;
 
    
 
    const unsigned char *dbytes = [data bytes];
 
        NSMutableString *hexStr =
 
           [NSMutableString stringWithCapacity:[data length]*2];
 
        int i;
 
        for (i = 0; i < [data length]; i++) {
 
            [hexStr appendFormat:@"%02x ", dbytes[i]];
 
        }
 
    receivecStr = [NSString stringWithString: hexStr];