This article shows how you can write RHMAP Cloud Apps to perform push notifications to: All devices subscribed to a ‘category’, enabling the possibility of users choosing the notification categories they find interesting. A specific group of users, providing efficient communication with a defined set of users. With RHMAP, it is simple to deliver a notification to a set of users/devices based on category. For example, if your app reports sports results, you can filter the results to only send...