I’m working on a project involving a robot controlled by an Android tablet. The robot tablet is running Android Pie 9 and uses a main application, which manages the robot’s reactions. We have developed an Android application that overlays the main app with a transparent background, so that the main app still runs in the background. The tablet has USB ports and I’m trying to connect an Arduino Nano board. We are using Arduino Nano A000005 ATmega328, 16MHz. The application, developed with Android Studio (Java) is based on the robot’s Android SDK (that might be the source of the problem ?).