mtkbabel | 1 1 + 0 - 0 !
1 file changed, 1 insertion(+)

 retry when an out-of-order packet received.
 Sometimes it happens that a packet is received with bad checksum.
 Which means, the next packet received will be considered out-of-order.
 And every next packet as well. To cope with that, we re-request the
 packet we're still waiting for.