Hi Nam Ki,

      If the application is running in an environment where sub-millisecond time responses are critical to the application performance then the appropriate release of VisiBroker is "VisiBroker RT" where the RT is short for "real time".  If the application in not that time critical then standard VisiBroker 8.5 could be used, but the RT version is required for time-critical applications where QoS settings can be used to guarantee timely completion of operations. 

https://www.microfocus.com/documentation/visibroker/visibroker-rt-60/pdfdoc/dev-guide.pdf

On page 4 - 

     VisiBroker RT has a new release scheduled for Q3 of 2024. I recommend contacting your sales representative to discuss obtaining the upcoming release when it becomes available. 

Best Regards,

-Scott Kay