Creating network connections with Godot is simple — as long as you have the other party’s IP address, and there’s no NAT gateway involved. Unfortunately, that’s exactly the problem in most cases. You don’t know the other party’s IP, and these days, just about everyone is behind a combination wifi router/gateway/firewall with NAT.
Conceptually, NAT hole-punching is pretty simple, and this video explains how it’s done with just netcat.
In a nutshell:
listen on a particular port (e.g. 50001)
nc -u -l 50001
echo ‘hello’ | nc -u ipaddr 50001
echo ‘hole punch’ | nc -u -p 50001 ipaddr 50002
third party exchanges ip addresses
Putting it all together, player A (hosting a game) would require the game to connect to the directory server.
The directory server would list the game as something a player can now connect to.
player B (client who wants to join) will tell the directory service that it wants to connect, and will send its info
The directory server forwards the information to player A (host), player A will then send a packet to player B, and respond to the directory server
The directory server will then tell player B to go ahead and connect to player A.
Player B should be able to punch through to player A
With Godot, the connections from client to host would use ENetMultiplayerPeer.create_client(), which can specify the local port.
Need optimized export templates with PCK encryption support but don’t want to have to set up a build pipeline or download the entire compilation toolchain on your computer? Well, now it is. Fill out the form, checkout, and we’ll email you the download link after the compilation completes. Compilation may take 30 minutes to 3 …
Any sufficiently large code base needs documentation. Documentation tends to come in all sorts of shapes and sizes. Among them are high-level architecture and design docs, class and method interface documentation, and inline comments to explain optimized or complex algorithms so the reader doesn’t have to parse the logic in their head (often, this is …
Here’s a tutorial on how to create breakable objects in Blender and Godot. It covers the steps needed to design and implement breakable objects, including scripting and using physics properties to make objects break apart into smaller pieces upon collision or other interactions.
Creating a UDP peer-to-peer connection
Creating network connections with Godot is simple — as long as you have the other party’s IP address, and there’s no NAT gateway involved. Unfortunately, that’s exactly the problem in most cases. You don’t know the other party’s IP, and these days, just about everyone is behind a combination wifi router/gateway/firewall with NAT.
Conceptually, NAT hole-punching is pretty simple, and this video explains how it’s done with just netcat.
In a nutshell:
Putting it all together, player A (hosting a game) would require the game to connect to the directory server.
With Godot, the connections from client to host would use ENetMultiplayerPeer.create_client(), which can specify the local port.
Here’s an older example of a signaling server: https://github.com/Faless/gd-webrtc-signalling/tree/master
Related Posts
Introducing GodotBuilder: Custom Export Templates built on demand
Need optimized export templates with PCK encryption support but don’t want to have to set up a build pipeline or download the entire compilation toolchain on your computer? Well, now it is. Fill out the form, checkout, and we’ll email you the download link after the compilation completes. Compilation may take 30 minutes to 3 …
Generating documentation for GDScript
Any sufficiently large code base needs documentation. Documentation tends to come in all sorts of shapes and sizes. Among them are high-level architecture and design docs, class and method interface documentation, and inline comments to explain optimized or complex algorithms so the reader doesn’t have to parse the logic in their head (often, this is …
Inventory System v1.7 available
A couple of corrections and a new feature: Bug fixes:
Making breakable objects in Godot
Here’s a tutorial on how to create breakable objects in Blender and Godot. It covers the steps needed to design and implement breakable objects, including scripting and using physics properties to make objects break apart into smaller pieces upon collision or other interactions.