Send Push Notifications from an OData Service using Windows Azure Notification Hubs

There are three main benefits provided to mobile device apps by cloud-based services: data access and storage, authentication, and push notifications—note that Windows Azure Mobile Services is a single Windows Azure service that supports all three. What about cases where Mobile Services isn’t the right solution, most likely because you have an existing set of data or have already published OData feeds. How to provide your customers with the goodness of push notification functionality in your mobile device app when that data comes from a standard OData service?