Using Request and Response will VerneMQ guarantee message delivery even if the VerneMQ Broker is very busy with over million messages been publish

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Hi All

We have 26 crititical applications running on Premise doing Request and Response to another 4000 applications running at Traffic controller at traffic intersections .
Can you please let us if we use Request and Response message from MQTT 5.x, will VerneMQ guarantee message delivery even if the VerneMQ Broker is very busy with over million messages been publish.

Thank you for your help

Regards, Bao

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This is way too generic a question. Running tests and drawing some (even preliminary) conclusions is the way to go.

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