MqttQoSLevel constants
MQTT has defined three QoS levels of message reliability.
MqttQoS0
(0) - The message arrives at the receiver either once or not at all.MqttQoS1
(1) - The message arrives at the receiver at least once.MqttQoS2
(2) - The message arrives at the receiver exactly once.Default value
If no constant is specified, it will use its default value, which is
MqttQoS0
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