Subscription Identifiers Not Supported

The server does not support Subscription Identifiers. Sent in a SUBACK or DISCONNECT packet when a client includes a Subscription Identifier in a SUBSCRIBE packet and the server has not announced support.

References

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

In this namespace

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ServerMoved ServerShuttingDown ServerUnavailable SessionTakenOver SharedSubscriptionsNotSupported SubscriptionIdentifiersNotSupported Success TopicAliasInvalid TopicFilterInvalid TopicNameInvalid UnspecifiedError