Client-server architecture in Unity - Mini Project: Build & Apply

Client-server architecture

📖 Scenario: You are building a simple client-server system in Unity to understand how data can be sent from a client to a server and back.Imagine a game where the client sends a player's name to the server, and the server responds with a welcome message.

🎯 Goal: Create a basic client-server communication in Unity using C# scripts. The client will send a player's name to the server, and the server will send back a welcome message. You will build this step-by-step.

📋 What You'll Learn

Create a server script that can receive a player's name

Create a client script that sends the player's name to the server

Implement simple message passing between client and server

Display the server's welcome message on the client

💡 Why This Matters

🌍 Real World

Client-server architecture is used in multiplayer games and networked applications to allow communication between players and game servers.

💼 Career

Understanding client-server communication is essential for game developers working on online multiplayer games or networked applications.

1

Create the Server script with a method to receive player name

Create a C# script called Server with a public method ReceivePlayerName that takes a string parameter called playerName. Inside the method, create a string variable called welcomeMessage and set it to the value $"Welcome, {playerName}!".

Unity

public class Server
{
    // Your code here
}

Need a hint?

Define a public method that returns a string. Use string interpolation to create the welcome message.

2

Create the Client script with a playerName variable

Create a C# script called Client with a public string variable called playerName and set it to "Alex".

Unity

public class Server
{
    public string ReceivePlayerName(string playerName)
    {
        string welcomeMessage = $"Welcome, {playerName}!";
        return welcomeMessage;
    }
}

public class Client
{
    // Your code here
}

Need a hint?

Declare a public string variable named playerName and assign it the value "Alex".

3

Add a method in Client to send playerName to Server and get response

In the Client class, add a public method called SendNameToServer that takes a Server object as a parameter. Inside this method, call the server's ReceivePlayerName method with playerName and store the result in a string variable called response.

Unity

public class Server
{
    public string ReceivePlayerName(string playerName)
    {
        string welcomeMessage = $"Welcome, {playerName}!";
        return welcomeMessage;
    }
}

public class Client
{
    public string playerName = "Alex";
    
    // Add SendNameToServer method here
    // Your code here
}

Need a hint?

Define a method that takes a Server object, calls its ReceivePlayerName method with playerName, and returns the response.

4

Print the server's welcome message in a Unity Start method

In the Client class, add a Start method. Inside it, create a new Server object, call SendNameToServer with this server, and print the returned welcome message using UnityEngine.Debug.Log.

Unity

public class Server
{
    public string ReceivePlayerName(string playerName)
    {
        string welcomeMessage = $"Welcome, {playerName}!";
        return welcomeMessage;
    }
}

public class Client
{
    public string playerName = "Alex";
    
    public string SendNameToServer(Server server)
    {
        string response = server.ReceivePlayerName(playerName);
        return response;
    }

    // Add Start method here
    // Your code here
}

Need a hint?

Use Debug.Log inside the Start method to print the welcome message.