Low-level handshake support for intro-and-renedezvous handshake
We'll need to write the code for handling an incoming INTRODUCE2 message, generating the responding RENDEZVOUS1 message, and everything that happens in between.
Part of #698 (closed).
We'll need to write the code for handling an incoming INTRODUCE2 message, generating the responding RENDEZVOUS1 message, and everything that happens in between.
Part of #698 (closed).