[Reposted] How to configure data reader to receive data in the order that are sent?

Please help, I am in a crunch mode for a demo and my DDS app is not behaving as expected.

I have two apps running in a standalone linux box.  App1 has one publisher with 4 datawriters, one for each topic.  This is supposed to be a realtime app which is required to write hundreds of messages per topic for each 640ms.  App2 is the receivers of all the messages that App1 publishes, one receiver per topic.  I am using UDP unicast for transport with ASYNCHRONOUS_PUBLISH_MODE_QOS and RELIABILITY_QOS.

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