SampleInfo and write_w_params

Hi,

I few questions regarding the relationship between the parameters in the sampleInfo struct and write_w_params (attached is the code I’m using).

1. Is the original_publication_virtual_guid is determined in the DR?  because each time I close the subscriber and then turns it back on (as late joiner) it identifies the publisher with different original_publication_virtual_guid.
2. Does the original_publication_virtual_sequence_number and publication_sequence_number serve different purposes? because no matter how I run the publisher and subscriber they are always identical.
3. What is the source_guid purpose? For what it is used in the subscriber?
4. When I use the write_w_params method (line 130 in HelloPublisher.cpp) I can see the following anomalies:
   1. When I uncomment line 119 (setting the writer_guid) the following scenario happens:

                                                               i.      Turning on publisher and subscriber à writing 3 messages à the messages appear in the subscriber with the same  original_publication_virtual_guid although I change it each time I send a new sample. In that case, how does the subscriber still keeps tracking the source of the message? Is it via IP?

                                                             ii.      Continuing the scenario above. After I shut down the publisher and turns it back on, the subscriber rejects any messages that have an original_publication_virtual_sequence_number which is lower than samples that were published in the previous cycle (before shutting down the publisher), afterwards the subscriber keeps getting messages as usual. This also happens if I don’t manually set the identity.sequence_number of the sample.

I will appreciate clarification of the above.

Thanks in advance,

Gal