Contains implementations of the MqttClientPersistence interface.

An MQTT client needs a persistence mechanism to store messages while they are in the process of being delivered. This package contains several implementations of the interface. If a persistence class is not specified on the constructor to an MQTT client, {@link org.eclipse.paho.client.mqttv3.persist.MqttDefaultFilePersistence MqttDefaultFilePersistence} is used by default.