Thank you , I think that fixed it. But I am stuck with another issue. I am running the server example and the client is running on an embedded device. I start the connection with ping request from client to which host responds correctly. The real issue comes up when client sends a TCP packet to which server doesn't respond back and I can see the TCP Retransmission packets being sent to the server.

To narrow down the issue, I ran a dummy server by opening a socket on my host machine listening at the same IP and port. In this case, I can see the client getting the response back of TCP request so I am assuming Firewall might not be the issue here.

I am using:

./configure --enable-cryptocb --disable-extended-master \
    --enable-psk --enable-aesccm --enable-jobserver=no \
    --disable-shared --enable-singlethreaded \
    --disable-sys-ca-certs

Also yes, the embedded client is running WolfSSL.

Logs attached herewith.

Thank you!