As promised in my August post I cleaned up the code for my relay server and uploaded a first version to GitHub under the name ConquestRelay. It is meant for hobby game developers prototyping their own online games, but still lacks a lot of functionality found in professional network layers.
As described in my previous post Unity makes it pretty hard for hobby developers to develop their own online games. It is impossible to run a game server created with Unity on an Amazon AWS instance due to the missing batchmode option. As a workaround I implemented a relay server for my current project which is based on WebSockets and allows me to run my own server at home, combined with the benefits of a server in the cloud with a fixed IP address.