Learn about the most important feature introduced in Bluetooth 5.1 — Direction Finding, using Angle of Arrival (AoA) and Angle of Departure (AoD). For more information about Ellisys Bluetooth and USB Protocol Analyzers visit Ellisys is a leading worldwide supplier of advanced protocol test, analysis, and standards compliance solutions for Bluetooth®, Wi-Fi®, USB 2.0, SuperSpeed USB 3.1, USB Power Delivery, USB Type-C™, DisplayPort™ and Thunderbolt™. Sniffers, Testers, and Analyzers.