Thank you for your question
Yes you can use MQTT protocol, but you need a dedicated firmware version.
Although we would like to inform you that we do not share firmware files/updater and other files in the community forum.
To receive firmware files, updater and documentation on devices, please contact your sales manager. If you don't have any contacts with our Sale managers, please contact with them on our official website https://teltonika-gps.com/
and click on the "Contact Us" button. When you will click, please fill the form and submit it.
Note: as a topic, please choose "Vehicle Telematics".
Or you can send an e-mail with description of your situation to firstname.lastname@example.org