sdamm
commented
3 years ago Sorry for the late response.
This is a bug in asio_dtls which I don't know how to fix. On the fix_handshake_timeouts branch I have a Fix which has the following downsides:
- timeout in handshake returns "Connection timed out" which is only somewhat correct
- the timeout closes the Socket (cancel would be an alternative, with some new downsides)
Could you please confirm that this fixes the issue (aside from the above mentioned Problems)?
Hi, I observe incorrect retransmission behaviors during handshake.
The first case is sending a retransmission when it is not needed because the server response comes in less than 1 second.
Additionally, the retransmission is sent at a completely unanticipated moment of the handshake.
The second case is not sending the retransmission at the right moment when the server needs more than 1 second to respond.
Here too, the retransmission is sent at unanticipated moment.
The third case also contains a issue with retransmission but additionally Client dose not respond to the Server Hello Done message.
In my application I use your DTLS code only for DTLS Clients. Server part is an independent application that uses plain OpenSSL in version 1.1.1d. In the cases described above I use 5 such Clients that try to connect to the server.
I did quite detailed review of your code in search of the issue but failed to find the cause. Do you have any idea what the issue might be or what I am doing wrong?