Integrate ENet transport protocol

[Frooxius]

Is your feature request related to a problem? Please describe.

We're currently relying on the LiteNetLib library as the network transport protocol, for both unreliable and reliable transfers. The performance of the library can sometimes cause issues, such as packet queuing and Steam Networking Sockets, which is currently lacking bandwidth estimation.

Describe the solution you'd like

Resonite supports hosting sessions on multiple protocols, which makes adding additional protocols relatively easy.

ENet is a commonly used library in game development and could provide better robustness and performance.

There are C# wrappers which include modified versions with IPv6 support: https://github.com/nxrighthere/ENet-CSharp

There are some challenges too:

• ENet doesn't natively support UDP punchthrough, allowing for easy peer to peer connections. This can be added on top of the library, but represents additional work
• We'll have to implement ENet relays as fallback too if we end up using this as the primary protocol

Describe alternatives you've considered

We are also looking into making changes to LNL library, such us changing the window size and implementing additional features, like late packet aggregation and dynamic window size changing, which might alleviate the problems altogether.

Additional Context

It's not actually known if this library would behave better overall network performance, so the implementation time carries a risk of being a wasted effort.

Requesters

No response

[iamgreaser]

Is there a suitable C# implementation of STUN? That could potentially save on a bit of work in terms of tunnelling.

Although then again, ENet does blur the line between a client and a server, so having a "server" establish a peer connection to one or two servers to perform hole-punching (or determine the infeasibility of it) might work.