Connect represents a CONNECT Message type.

ConnectAcknowledge represents a CONNECT Acknowledge Message type.

ControlMessage is a Flow Control Message.

Disconnect is to signal client want to cease communications with the server.

PingRequest is a keepalive.

Publish represents a PUBREQ Message type.

Relay tells the server which topics and last durations the client would like get data.

RelayRequest is pairing the Topic and Last parameter together.

Subscribe tells the server which topics the client would like to subscribe to and choose a Delivery Mode.

Subscription is pairing the Delivery Mode and Topic together for the delivery mode's pairs in unsubscribe and subscribe.

Unsubscribe is the Message to send if you don't want to subscribe to a topic anymore.