TLS 1.3 Session Resumption with PSKs in pyopenssl? about pyopenssl HOT 1 CLOSED

I figured out that this is indeed possible with pyOpenSSL, with the standard mechanism described below. I assume OpenSSL is handling the details of the implementation internally.
On the server side, I used

 context.set_session_cache_mode(SSL.SESS_CACHE_SERVER)
 context.set_session_id(b"test")

and on the client side

context.set_session_cache_mode(SSL.SESS_CACHE_CLIENT)
session = None
...
ssl_connection.connect(endpoint)
if session:
    ssl_connection.set_session(session)
ssl_connection.do_handshake()
data = ssl_connection.recv(1)
if data:
    session = ssl_connection.get_session()

My problem was that previously, I saved the session right after the handshake before receiving any data.
This meant that no Session Ticket was received yet and thus the session could not be reused.
The New Session Ticket Message is sent before the first application data, so when the first byte of data arrives I can store the session for reuse.

from pyopenssl.