Samsung Accessory SDK for .Net projects like Xamarin.Android this project is xamarin.android binding version of Samsung Accessory SDK Using this package you can develop communication between your Galaxy devices and Android app. https://developer.samsung.com/galaxy-accessory/overview.html
Samsung currently doesn't have any package or dll for xamarin.android but only for java and native. Installing nuget https://www.nuget.org/packages/SamsungAccessorySDK.Net/ you can access all samsung consumer and provider api functionality in your xamarin.android app.