Dear all,

first of all, nice to meet you!

I am currently working on an implementation of an email client with lwIP
2.1.0 and I need to add TLS security so that I can communicate with the
Gmail SMTP server.

I can see in *smtp.c* that there are functions to implement the TLS layer
on top of TCP however I'm not entirely sure where to start.

What's the information I should pass to the *smtp_set_tls_config(struct
altcp_tls_config *tls_config) *function?

Do I need to embed the certificates from Gmail in my implementation (
https://support.google.com/a/answer/6180220?hl=en)?

Sorry for all the questions, I'm just looking for a place to start with
this as I'm pretty new to the TLS cryptographic protocol. Any hint will be
greatly appreciated.

Looking forward to hearing from you.

Manuel
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