In this article, we zoom in on establishing a connection between two devices running an instance of the game we are about to create. Even though this may sound trivial, there are quite a few components involved to make this work. Before we get our hands dirty, let me walk you through the process step by step. In the previous article, I wrote about the client-server model. Before we create the game itself, we need to implement the client-server model in the application. Two devices each running a different instance of the game won't magically find each other on the network and start a game. One instance needs to act as the server and make it known to other instances on the network that they can join. A common approach to solve this problem is by allowing players to host or join a game. The device of a player hosting a game acts as a server, while the device of a player joining a game acts as a client connecting to a server. The server provides a service and it can announce this on the network using Bonjour. The device of the player looking for a session to join searches the network for services also using Bonjour. When a player joins a game, the service is resolved and the client device attempts to establish a connection between the two devices so that the game can start. If you are confused by the client-server model, then I recommend revisiting the first part of this series in which the client-server model is described in more detail.


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