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A lot of DTLS test are timing-sensitive, especially those that contain assertions about retransmission. Sometimes some DTLS test fails intermittently on the CI with no clear apparent reason; we need more information in the log to understand the cause of those failures. Adding a proxy means we'll get timing information from the proxy logs. An alternative would be to add timing information to the debug output of ssl_server2 and ssl_client2. But that's more complex because getting sub-second timing info is outside the scope of the C standard, and our current timing module only provides a APi for sub-second intervals, not absolute time. Using the proxy is easier as it's a single point that sees all messages, so elapsed time is fine here, and it's already implemented in the proxy output. Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>