If you are looking for a Xamarin Android sample that show how to manage the Pebble Sport app from a Xamarin Project, I have just released on github a sample for you!:-)
Because I haven't found out there any sample that shows to use Pebble SDK from Xamarin, I decided to write this one.
In order to use latest Pebble aar libary available, go to: https://oss.sonatype.org and look for "com.getpebble". Download the aar file and use it in a xamarin binding library as shown here.