How to simulate "TLS 1.3 Session Resumption" through OpenSSL tools?

[Nan Xiao]

Hi OpenSSL users,

Greetings from me! From this article
(https://www.qacafe.com/resources/examples-of-tls-1-3/) and pcap file
(https://www.cloudshark.org/captures/64d433b1585a), I know we can use
s_server and s_client to simulate "TLS 1.3 Session Resumption". I
tried following command:

echo | openssl s_client -tls1_3  -connect tls13.cloudflare.com:443 -reconnect

But it seems not to work since there is no "pre_shared_key" extension,
and every time s_client just initiated a new connection instead of
resumption.

Could anybody advise how to simulate "TLS 1.3 Session Resumption"
through OpenSSL tools? Thanks very much in advance!

Best Regards
Nan Xiao