.. include:: vars.rst

.. _section-FAQs:


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 :numref:`Section-TopicInfo` 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.