The socket closed.
When to call tick next, in ms, or undefined.
Whether Kick accepted the connection.
Whether a feed is subscribed.
The socket opened.
A text frame arrived.
A new token, after a refresh_token action.
The clock reached deadline().
One connection's protocol. Each method returns the actions to carry out.
nowis whole milliseconds from a clock that only goes forward (Math.floor(performance.now()), orDate.now()).