Question [Fishnet] How can I implement P2P multiplayer for my simple game?

Hi, briefly about me so you catch the context, I've been in web dev for a few years now, about a month ago I started learning C# and wanted to make my own 2D game, so I did what most beginners do, I watched a tutorial. Okay, so I have my really simple game and some basic understanding of what is going on in Unity, however, I thought it would be useful to learn some multiplayer technology (and implement it in my simple game) so that I can create some CO-OP game in the future. I'm pretty sure I only want to publish my game on Steam, so using the steam lobby (or SteamAPI, I'm new, I don't really see the difference) would make sense (however, I'd love to learn universal methods as well). Since producing the game is a big expense anyway I wouldn't want to pay extra for servers, so I thought of a P2P solution, because I would like a player to host his own server, and others to join him (the game will be a typical COOP for friends, so no need to worry about cheaters). However, I'm aware of things like, different types of NAT, required port forwarding, etc. and I'd like to avoid a situation where a casual player would have to deal with this. So I found out about FishNet, however, I still don't know if it will fit my assumptions. Is what I described even possible? And has any documentation/guide been created on this subject? I know that there have been quite a few tutorials on the topic of multiplayer, but I have not found one that discusses in depth the topic of hosting a server by the player (where the player has a role as a server and as a client).

 

Yup that's possible.

FishNet pairs with FishySteamworks which is turn uses Steamworks.NET or a paid solution like Heathen Steamworks (built on top of Steamworks.NET). The APIs are pretty good at removing the complexity from the process.

For tips on integrating with Steam, FishNet has a Discord and you can often find what you want just by searching their discord. There's also the docs. And don't forget to study their official examples to avoid headaches.