Client side delivery guarantee (QoS 1 or 2)

**Steps:**

1 - Connect to Broker
2 - Subscribe to the topic "test/"
2 - Disconnect the client
3 - Send a message to a topic "test/" with QoS 1 or 2
4 - Close the application
5 - Open the application
6 - Connect to Broker

**Result:**

Messages sent with QoS 1 and 2 will be lost

**Expected results**

Resend messages after restarting the application using MQTT only

By MQTT protocol specification, when using QoS 1 or 2, you are guaranteed that the message arrives in the broker, but if the client is offline and restart the application, the message will be loss

Using ManagedClient I will have the guarantee that the message will be delivered, but it has some limitations like `CleanSession = false`, so I can not guarantee that QoS 1 or 2 will reach me

It seems to me that the QoS 1 and 2 delivery guarantee defined in the MQTT protocol is not being met.

Is there any plan for this?