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Events
Events can be an extremely important mechanism used for remote systems to monitor unexpected or expected anomalies and events occuring on these systems. They are oftentimes tied to Fault Detection, Isolation and Recovery (FDIR) operations, which need to happen autonomously.
Events can also be used as a convenient Inter-Process Communication (IPC) mechansism, which is also observable for the Ground segment. The PUS Service 5 standardizes how the ground interface for events might look like, but does not specify how other software components might react to those events. There is the PUS Service 19, which might be used for that purpose, but the event components recommended by this framework do not really need this service.
The following images shows how the flow of events could look like in a system where components can generate events, and where other system components might be interested in those events:
