ClientId
Unique identification of the MQTT client sending the message.

Topic
Topic of the MQTT message.

Utf8PayloadString
Content of the message as UTF8 string.

PayloadByteArray
Content of the message as a byte array.

QualityOfServiceLevel
QoS level of the message.

Retain
Marks the Retain flag in the MQTT message. The broker is instructed to cache the last message sent to the topic. Clients that connect to the broker at a later time will receive this message.

Dup
The DUP flag indicates whether the message is a duplicate.

ContentType
Content Type of the message.

ResponseTopic
Topic of the reply message.

ProcessingFailed
Indicates that the processing of the message failed.

ReasonCode
Reason for the failure to process the message:
Success
NoMatchingSubscribers
UnspecifiedError
ImplementationSpecificError
NotAuthorized
TopicNameInvalid
PacketIdentifierInUse
PacketIdentifierNotFound
QuotaExceeded
PayloadFormatInvalid

IsHandled
Indicates whether the message has been processed.

AutoAcknowledge
Specifies whether MQTT ACK messages are sent automatically.