extmod/mbedtls: Implement DTLS HelloVerify cookie support.

This is already enabled in the ESP-IDF mbedTLS config, so provide an
implementation of the cookie store functions. This allows DTLS connections
between two esp32 boards.

The session cookie store is a very simple dictionary associated with the
SSLContext. To work, the server needs to reuse the same SSLContext (but
cookies are never cleaned up, so a server with a high number of clients
should recycle the context periodically.)

Server code still needs to handle the MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
error by waiting for the next UDP packet from the client.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

0 files changed, 0 insertions, 0 deletions