The previous recipe taught us how to call a server-side method exposed by a Hub and how to receive its return value, if any. As we already explained in Chapter 2, Using Hubs, SignalR really shines when we have to push information to several connected clients at the same time, and we illustrated the various APIs available to do this. In this recipe, we'll concentrate again on those strategies, and in particular on notifying the caller, but our focus will be on explaining the client-side mechanics involved when receiving server-to-client calls.
We need to prepare our Hub, and to do this we need to perform the following steps:
Add a Hub-derived type that we'll call
Add an OWIN Startup class bootstrapping SignalR with a call to