HI Deepak,
I went through the ssl_client2 example but i cant use sockets as I don’t have an OS.
Yes, I am aware you can’t use sockets, as you don’t have an OS, but this was an example for you to see how you wrap the Transport Layer functions that are defined in the platform( socket API in this example, while in your case it should be the lwIP functionality).
Once you set these callbacks to mbedtls_ssl_set_bio(), and you setup your network functionality ( if needed). then the TLS should be seemless as shown in the example.
Have you looked in this post?
Regards