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.

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Requirements

Dependency	Version	Notes
Godot Engine	4.4+
GodotSteam GDExtension	Latest	Must be installed manually
Steam Client	Any	Must be running when testing

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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

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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

Singleton	Path	Description
SteamManager	addons/fsi/managers/SteamManager.gd	Steam initialisation and player info
NetworkManager	addons/fsi/managers/NetworkManager.gd	Lobby and P2P networking

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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"])

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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.

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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.