Add support for the Simple Network Protocol

[GabrielMajeri]

This issue tracks the crate's support for the UEFI Simple Network Protocol.

There was a PR for implementing this protocol, but it was closed without getting finalized.

[d-sonuga]

Hello. I'm new here and I would like to add the SNP Protocol. Do I just get started immediately or are there some things I have to do first?

[nicholasbishop]

Hi, and welcome :) You can feel free to jump right in. There is a prior PR (linked above) that you can use as a base if you want, but feel free to proceed however your like. Please also feel free to ask any questions you might have.

[d-sonuga]

Thanks. I'll just get started then.

[d-sonuga]

Hi. I made quite some progress with the basic wrapper for the SNP but I'm really stumped on the test right now. The receive buffers just never receive. Any suggestions for dealing with this kind of thing?

[nicholasbishop]

Want to post a draft PR with what you have? I'd be happy to take a look at that and see if I can spot anything. It's hard to make a specific suggestion otherwise, since there are just so many different things that can go wrong.

[d-sonuga]

I've posted a draft PR here: #541