Ack will deliver an ack for a delivered msg.

Protocol for a client to close a connection.

Response for CloseRequest.

Connection Request.

Response to a client connect.

Msg struct.

PING from client to server.

PING response from the server.

Used to ACK to publishers.

How messages are delivered to the STAN cluster.

Protocol for a client to subscribe.

Response for SubscriptionRequest and UnsubscribeRequests.

Protocol for a clients to unsubscribe.

Enum for start position type.