Hi, all

Event mechanism in Ryu confused me a little, and It seems that no document on 
this topic is available... I need some help here.

There are 2 Ryu apps working together in my design, one is for doing some 
monitoring and another acts as SDN controller, called "main app". I need the 
monitoring app to generate asynchronized events to "main app", which in turn 
can be "heard" and handled by "main app".

I tried to use build-in Event mechanism but it didn't work (Actually, after 
apps are instantiated, I failed to find a way to invoke my own function which 
generate Events, because all functions in Ryu app can only be triggered by 
another event. Seems like a dead lock, aha? ), could anyone tell me how to do 
that? Maybe there are better solutions?

Thanks a lot!

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