A Will message is published by the server if a client is lost unexpectedly.
The Will message is stored on the server when a client connects. It is published if the client connection is lost without the server receiving a DISCONNECT packet.
[MQTT - 3.1.2 - 8]
Content of Will message.
QoS used when publishing the Will message.
Whether the Will message is to be retained when it is published.
Topic to publish Will message on.
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