Module session 

Session lifecycle messages: handshake, token refresh, keepalive.

Structs

HandshakeAckMsg

Handshake acknowledgment (server → client, 0x02).

HandshakeMsg

Handshake message (client → server, 0x01).

PingPongMsg

Ping/Pong keepalive (0xFF).

TokenRefreshAckMsg

Token refresh acknowledgment (server → client, 0x61).

TokenRefreshMsg

Token refresh request (client → server, 0x60).