BuddyPress.org

I’m trying to put together a mobile app for a Buddypress site (really just a mobile version of the site in an app wrapper). A major feature the client wants is push notifications from the activity stream. Ideally we could filter what type of content triggers these push notifications.

Does anyone know of any plugins that can do this? I was looking App Presser, they say they can handle push notifications but it seems rather vague as to what type of content will trigger a notification, and also that version of App Presser is pretty expensive. Are there any alternatives to that? Thanks!