[TLS] Stopping retransmission DTLS 1.2

[Simon Bernard <[e-mail]>]

Hi,

    The RFC6347, 4.2.4 [1] say :

         "3. The implementation receives the next flight of messages: if 
this
         is the final flight of messages, the implementation transitions to
         FINISHED. If the implementation needs to send a new flight, it
         transitions to the PREPARING state. Partial reads (whether
         partial messages or only some of the messages in the flight) do
         not cause state transitions or timer resets."

    I would like to know why "partial reads do not cause state timer 
resets".

    I mean if we receive the first "handshake message" of the expected 
"flight". we can assume that the foreign peer received our previous 
flight and so we can stop retransmissions of this flight.
    If the next message is lost, we will never respond and so the 
foreign peer should retransmit the whole flight. We don't need to 
retransmit on our side, so timer should be reset ?

    Did I missed something ?

Thx.

Simon

[1]https://tools.ietf.org/html/rfc6347#section-4.2.4