Why my rtps emulator didn't work?

[mirusu400]

Hello, for now, I'm testing my emulator works with DevGuideExamples/DCPS/Messgenger project. However, even if me continue to emulate publisher behavior, matching and data exchange will not occur normally.

Can anyone check what am I wrong? I fully emulated most submessages, GUIDs, packets. I also minimize my idls for testing.

Here are my fork for test:
https://github.com/mirusu400/OpenDDS/tree/add-logging

Also here are my test python script (need scapy / should manually changing host IP):

opendds_packet_emulator.zip

When I turn -DCPSTransportDebugLevel to 10, it seems that DataReaderImpl::transport_assoc_done didn't triggered (so it cannot get matched), but I didn't find any reasons even I reviewed my packet, scripts, codes.. for almost a week.

Is anyone tell me any wrong points of my script or give me some checking points / tips for debugging 😢

[mitza-oci]

Please attach the plaintext log files.

I'm not sure if this is actually a question about OpenDDS - but we can try to answer it anyway. It might help if you gave some more context about what you're developing.

[mirusu400]

sub_original.txt
sub_emulator2.txt

Here are two log files - sub_original.txt is connetions subscriber log between both programs - publisher and subscriber, and sub_emulator2.txt is between my emulator and subscriber

Also here are my running commands:

./publisher -DCPSConfigFile rtps.ini -DCPSTransportDebugLevel 10

[jrw972]

This doesn't seem to be a question about using OpenDDS or how OpenDDS works.
I suggest that you perform a packet capture using an RTPS example, for example, DevGuideExamples/DCPS/Messenger with --rtps.
You can compare this to the behavior of your emulator.
Then, we can address specific questions about OpenDDS's implementation of RTPS.

[mirusu400]

I already capture packets using DevGuideExamples/DCPS/Messenger, and made my emulator. I have conducted extensive comparisons, nearly 100 times, between the packets of publisher and my emulator. However, I can't find any difference! I suspect that the challenge in achieving a match may be related to heartbeat and acknack functionalities. Unfortunately, I lack a clear understanding of how these mechanisms operate, hindering my ability to emulate them.

[jrw972]

If you do not understand heartbeats and acknacks, then I recommend reading the RTPS Spec https://www.omg.org/spec/DDSI-RTPS/2.5/About-DDSI-RTPS. Perhaps that will give you the information you need to debug your emulator.