Subscribe to MQTT topic from a specific device

Question

I have a particular need:

I have a device that publishes data for example data pair is {"VazaoM":10.0, "VazaoM":20.0, "VazaoH": 30.0}

This works perfectly on Thingsboard, I present this data on the Dashboard perfectly.

My problem is:

I have a second Device that connects to ThingsBoard in which I would like to subscribe to a specific topic and receive that value from the key pair.

I will post an example of this Device here:

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These are the product Connection screens:

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Here is the link to the product in case anyone knows and can help me: text

I would like to know which way to go on ThingsBoard, because each device has a unique connection and the connection cannot be shared and it cannot be signed by other devices, they do not share data between themselves.

Which path should I follow?