Diagram is not clear. Why is the left "Driving Application" using a dotted outline? Is "Event notification" "not used for websockets" like Intent verification, or what is the meaning of the dotted arrow? Do the arrows labelled "internal" mean the communication between the Hub and Driving Application are internal, which would imply that the Hub and Driving Application are actually one application?

(Comment 3 - imported by: Lloyd McKenzie)