The original version of this test had to exchange a 1 byte UDP packet
before the DTLS handshake. This is no longer needed due to MSG_PEEK
support.
The test also doesn't work with HelloVerify enabled, as the first
connection attempt always fails with an
MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED result. Anticipate this by listening
for the client twice on the server side.
This work was funded through GitHub Sponsors.
Signed-off-by: Angus Gratton <angus@redyak.com.au>
This adds a multi-test for DTLS server and client behaviour. It works on
all ports that enable this feature (eg unix, esp32, rp2, stm32), but
bare-metal ports that use lwIP are not reliable as the DTLS server because
the lwIP bindings only support queuing one UDP packet at a time (that needs
to be fixed).
Also, to properly implement a DTLS server sockets need to support
`socket.recvfrom(n, MSG_PEEK)`. That can be implemented in the future.
Signed-off-by: Damien George <damien@micropython.org>
