KeepAlive
The keep alive is a time interval in seconds that the client specifies and communicates to the broker when the connection established. This interval defines the longest period of time that the broker and client can endure without sending a message. The client commits to sending regular PING Request messages to the broker. The broker responds with a PING response. This method allows both sides to determine if the other one is still available. See part 10 of this series for detailed information about the MQTT keep alive functionality.

Basically, that is all the information that is all you need to connect to an MQTT broker from an MQTT 3.1.1 client. Individual libraries often have additional options that you can configure. For example, the way that queued messages are stored in a specific implementation.