Marco Oliverio b1b49c9ffb dtls13: always send ACKs on detected retransmission ...

Otherwise the connection can stall due the indefinite delay of an explicit ACK,
for exapmle:

 -> client sends the last Finished message
<- server sends the ACK, but the ACK is lost
 -> client rentrasmit the Finished message
 - server delay sending of the ACK until a fast timeout
 -> client rentrasmit the Finished message quicker than the server timeout
 - server resets the timeout, delaying sending the ACK
 -> client rentrasmit the Finished...

2025-06-16 14:19:32 +02:00

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