Handshake message on connect

[Sardelka9515]

It'll be nice to be able to send a handshake message on connect, allowing the server to reject connection or send a HandshakeSucess message back

[jchristn]

Is the use case to be able to reject a connection server-side? The library provides such a capability. Please help me understand the goal. Cheers

[Sardelka9515]

A handshake message on connect will provide ability of custom authentication #117, e.g. username/password validation.
Also the server could use the handshake message to initialize a client.

[Sardelka9515]

Like Lidgren.Network's connection approval

[jchristn]

Got it. Thanks for the context. I'd happily take a PR on this if you're up for it!