The (I believe) author of this posted it on the golang subreddit a few days ago. It looks like he's very open to contributions if you're willing to help.
https://www.reddit.com/r/golang/comments/kxe5bi/mnm_an_open_...
The one interesting link from his post, is a link to the spec itself. https://github.com/networkimprov/mnm/blob/master/Protocol.md