GitHub user numinnex added a comment to the discussion: Simulator "Kill Node" 
Operation - Design Discussion

I agree with the idea of using message bus as just outbox (this makes sense 
from the point of view how a real TCP based MessageBus actually works) and 
simulating it this way is definitely the way to go. 

The thing that I am puzzled about is how to do it in a way where we can use 
exactly the same primitive `IggyShard` both by the simulator, aswell as the 
production binary. In the production binary we have bunch of listeners 
(tcp_listener, websocket listener, quic listner), that spawn dedicated `compio` 
task for each connection that busy loops waiting for incomming packets and 
turning those into messages. In the simulator tho, we would like the simulator 
step function to replace the functionality of those listeners. I guess one 
approach that we could take is simply disabling those `listeners` in the 
simulator (similarly how we do it right now, we use the config to check whether 
we want to expose `tcp`, `websocket`, `quic` and `http` listeners, then in the 
`simulator` binary we would have an explicit `step` function that would play 
the role of those `listeners`, by draining the message_bus outbox. 

GitHub link: 
https://github.com/apache/iggy/discussions/3017#discussioncomment-16297402

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