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I only found it here: https://support.ptc.com/help/thingworx/platform/r9/en/index.html#page/ThingWorx/Help/Release_Notes/FixedIssues/Fixed_Issues_in_ThingWorx_Platform_9.3.3.html if you search for "MQTT Extension 3.1.0" in the page
I only found it here: https://support.ptc.com/help/thingworx/platform/r9/en/index.html#page/ThingWorx/Help/Release_Notes/FixedIssues/Fixed_Issues_in_ThingWorx_Platform_9.3.3.html if you search for "MQTT Extension 3.1.0" in the page