Fxll3n's Steam Integration (FSI)

A Godot 4 plugin that provides Steam lobby management, P2P packet networking, and player management using the GodotSteam GDExtension.

⚠️ This plugin requires the GodotSteam GDExtension and is NOT a standalone plugin.
You must install the GodotSteam GDExtension separately before using this plugin.

Requirements

Installation

1. Install the GodotSteam GDExtension

This plugin depends on GodotSteam. Follow the official GodotSteam installation instructions:

• Download the GDExtension from the GodotSteam releases page.
• Place the addons/godotsteam/ folder into your project's addons/ directory.
• Enable the extension in your project (it should be detected automatically).

2. Install This Plugin

Via the Godot Asset Library (recommended):

1. Open your Godot project.
2. Go to AssetLib tab.
3. Search for Fxll3n's Steam Integration.
4. Click Download and then Install.

Manually:

1. Copy the addons/fsi/ folder into your project's addons/ directory.
2. In Godot, open Project → Project Settings → Plugins.
3. Enable Fxll3n's Steam Integration.

3. Configure Your App ID

Set your Steam App ID in steam_appid.txt in the root of your project (use 480 for Spacewar during development):

480

Features

• SteamManager autoload — Initialises Steam, exposes steam_id, steam_username, and steam_avatar.
• NetworkManager autoload — Creates and joins Steam lobbies, sends/receives P2P packets, handles handshakes.

Autoloads Added by This Plugin

Usage

Creating a Lobby

NetworkManager.create_lobby()

Joining a Lobby

NetworkManager.join_lobby(lobby_id)

Sending a P2P Packet

NetworkManager.send_p2p_packet(
    NetworkManager.ALL_TARGETS,
    {
        "tag": "my_tag",
        "data": "hello"
    }
)

Receiving Packets

func _ready() -> void:
    NetworkManager.recieved_packet.connect(_on_packet_received)

func _on_packet_received(packet_data: Dictionary) -> void:
    print(packet_data["tag"])

Demo

A working demo scene is included under addons/fsi/demo/. It demonstrates:

• Lobby creation and joining
• P2P packet sending (chat messages, game start)
• Player spawning synced over Steam P2P

The demo also uses LimboConsole for in-game debugging.

License

This plugin is released under the MIT License.

The GodotSteam GDExtension is a separate project with its own license — see the GodotSteam repository for details.