MQTT message timestamp

I want to recover an MQTT message publish timestamp but I couldn't find Support in the subscriber library. In the other hand I see MQTT.fx client is able to recover this Information. Anyone knows how to handle that?

MQTT. fx client -> message timestamp

Solution

There is no timestamp in the message, there is no where to store such information in the MQTT v3 header.

MQTT.fx must be using time of arrival at the client.

If you need a published time you will have to add it to the message payload yourself.