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The chart below summarizes how Quality of Service (QOS), Clean Session flag and Retain Message flag affects what messages are received.

Retain Message flag	Clean Session flag	Subscribe QOS	Publish QOS	Published Message Always Received
False	True	0	0	No
False	True	0	1 or 2	No
False	True	1 or 2	0	No
False	True	1 or 2	1 or 2	No
False	False	0	0	No
False	False	0	1 or 2	No
False	False	1 or 2	0	No
False	False	1 or 2	1 or 2	Yes - all messages
True	True	0	0	Yes - last message only for each unique MQTT topic
True	True	0	1 or 2	Yes - last message only for each unique MQTT topic
True	True	1 or 2	0	Yes - last message only for each unique MQTT topic
True	True	1 or 2	1 or 2	Yes - last message only for each unique MQTT topic
True	False	0	0	Yes - last message only for each unique MQTT topic
True	False	0	1 or 2	Yes - last message only for each unique MQTT topic
True	False	1 or 2	0	Yes - last message only for each unique MQTT topic
True	False	1 or 2	1 or 2	Yes - all messages

How do I identify which MQTT clients are connecting using 'Clean Session' set to False

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The Chariot UI will display MQTT Client detail under MQTT > Client Status

By default MQTT Distributor com.cirruslink.chariot.server.core.PacketHandler will log each MQTT client subscription as shown below:

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The [] after the topic subscription indicates the quality of service. For example:

The Chariot UI will display MQTT Client detail under MQTT > Client Status

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