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topic
String topic
The topic to which the message was published.
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messageId
int messageId
The MQTT id that identifies a message received from the broker.
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qos
int qos
The quality of service with which the message was delivered by the broker.
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isDuplicate
boolean isDuplicate
If set to true, this message might be a duplicate of one which has already been received.
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isRetained
boolean isRetained
If set to true, this message was either sent from a current publisher, or was "retained" by the server
as the last message published on the topic.