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You probably want a display filter on TCP (or UDP) port. Most applications will use a specific port along with protocol (TCP or UDP) to identify which specific application is sending and receiving the data on the network.

Here is an older question with some details: .

Here is some info as well.

Do you know which port and protocol your specific application uses?

It is possible to do a capture filter where only the specific traffic you want is captured and saved for analysis. I don't recommend this in the beginning until you know exactly what you are looking for so I would capture everything then use display filters to hide the trivial many packets from the critical few you are looking for.