Identifying which Bluetooth packets include the actual information that is sent between devices

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I would like to know if there is some general rule in Bluetooth protocol, that can help to identify which packets contain the actual information that is sent between the devices. In other words, having a pcap file from a Bluetooth transmission, I want to isolate the packets that include the actual data that are sent between the devices from the packets that are used to establish the connection, to confirm the packet delivery, etc. Thank you in advance!