An application that sits will just do that. It has no idea about the outside world, no idea about anyone trying to contact them, and moreover, no idea about where it is. In the last chapter, we looked at how to use the address book. In this chapter, we will expand on this, use some of the hardware facilities, and communicate with the outside world via push notifications.
In this chapter, we will:
One useful feature of a messenger app would be to find people who are also using the application. In order to do this, we will need to talk from the PCL to the app and then send this up to the server.
The server ...