I have finished a project which contains MbedTLS. It has HTTPS client which uses this.
A huge chunk of code, over 200k (32F417) but does seem to work. TLS is difficult to integrate; connects to LWIP in this case which also works.
What input are you specifically looking for? You must have a specific use case for TLS, because embedded (IoT) devices on open ports, for public access, are a really bad idea. See past threads on this, and a "wide variety of views".