For networking I use a combination of Godot's RPC commands[0], their new high-level nodes[1][2] and a fork of GodotSteam[3], which passes it all through Steam's INetworkMessages framework.

[0] https://docs.godotengine.org/en/stable/tutorials/networking/... [1] https://docs.godotengine.org/en/stable/classes/class_multipl... [2] https://docs.godotengine.org/en/stable/classes/class_multipl... [3] https://github.com/cridenour/GodotSteam