digraph "Server Connection Flow" {
    node [shape=box];
    graph [newrank=true];

    new_connection [label="New connection"];
    wait_handshake [label="Wait for handshake"];
    validate_register [label="Validate register"];
    validate_resume [label="Validate resume"];
    connected [label="Connected"];
    close [label="Close connection"];

    new_connection -> wait_handshake [label="Send hello"];
    wait_handshake -> validate_register [label="Receive register_*"];
    wait_handshake -> validate_resume [label="Receive resume"];
    wait_handshake -> close [label="Bad handshake\nTimeout"];
    validate_register -> close [label="Bad token\nBad register"];
    validate_register -> connected [label="Valid register:\nSend ready"];
    validate_resume -> close [label="Bad token\nBad resume"];
    validate_resume -> wait_handshake [label="Bad session:\nsend invalidate"];
    validate_resume -> connected [label="Valid resume:\nSend continue"];
}