Language compiler converts refers directly to a language compiler for the next platform binaries. Xamarin framework is relatively well-known, although it is embedded in the Android platform Mono virtual machine to achieve, but in the AOT's iOS platform is compiled into a binary file, so it attributed to language compiler conversion type.
Xamarin was founded in 2011, it was officially acquired by Microsoft in 2016. Xamarin is a branch of Mono project, an open source project based on cross-platform .NET implementation.
xamarin-android- https://github.com/xamarin/xamarin-android
Xamarin.Android provides open-source bindings of the Android SDK for use with .NET managed languages such as C#.
Bluetooth LE plugin for Xamarin- https://github.com/xabre/xamarin-bluetooth-le
Bytecode, a common framework AspectJ, Javasist, ASM.