Unsupported Protocol Version

The server does not support the version of the MQTT protocol requested by the client. Sent in a CONNACK packet when the client's protocol level field is not recognised by the server.

References

docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html

In this namespace

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Success TopicAliasInvalid TopicFilterInvalid TopicNameInvalid UnspecifiedError UnsupportedProtocolVersion UseAnotherServer WildcardSubscriptionsNotSupported