Packet Identifier In Use

The specified Packet Identifier is already in use for an outstanding QoS 1 or QoS 2 message. Sent in a PUBACK or SUBACK packet to indicate a protocol flow conflict.

References

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

In this namespace

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MessageRateTooHigh NoMatchingSubscribers NormalDisconnection NoSubscriptionFound NotAuthorized PacketIdentifierInUse PacketIdentifierNotFound PacketTooLarge PayloadFormatInvalid ProtocolError QoSNotSupported