Write command to blink(1), low-level internal use
        Send USB Feature Report 0x01 to blink(1) with 8-byte payload
        Note: arg 'buf' must be 8 bytes or bad things happen

def write(self,buf):
        """
        Write command to blink(1), low-level internal use
        Send USB Feature Report 0x01 to blink(1) with 8-byte payload
        Note: arg 'buf' must be 8 bytes or bad things happen
        """
        log.debug("blink1write:" + ",".join('0x%02x' % v for v in buf))
        self.dev.send_feature_report(buf)