8. FAQs

• Can I use Wireshark to inspect the user data of my samples?

  No. The RTPS dissector does not deserialize the serialized data. It only dissects the RTPS protocol-related fields.

• Why do I see some bytes set to 0 that are not dissected between fields?

  Those bytes are padding inserted for alignment purposes.

• Why can’t I see the topic in the dissection of a DATA packet?

  There is a feature called Topic Information that can show you the Topic’s name. (It is disabled by default.) See Section 2.5 in this document.

• Where can I find more information about the RTPS specification?

  • RTPS Specification: https://www.omg.org/spec/DDSI-RTPS/2.1
  • DDS Security Specification: https://www.omg.org/spec/DDS-SECURITY

• How can I tell when discovery has finished?

  See https://community.rti.com/howto/how-determine-wireshark-when-discovery-completed.

• Can I use Wireshark to inspect data through shared memory?

  Yes.

• How can I capture traffic being sent through shared memory?

  See https://community.rti.com/kb/how-capture-traffic-if-my-connext-dds-applications-are-communicating-through-shared-memory.