MqttVersion constants
The version of the MQTT protocol.
MqttVersion310
(3) - The MQTT version is 3.1.0.MqttVersion311
(4) - The MQTT version is 3.1.1.MqttVersion500
(5) - The MQTT version is 5.0.0.Default value
If no constant is specified, it will use its default value, which is
MqttVersion500
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