I need an Android-only application that lets me simulate a weighing scale for testing purposes and, when required, switch to a live feed from an actual scale so the result can be passed straight into a POS system. In practice that means the app must: • Generate test weights on screen at the tap of a button or on a timer, so I can verify downstream software without having a physical device handy. • Detect and read a real scale over Bluetooth or USB (I can adapt to either, just let me know which SDK you plan to use) and forward the real-time weight to the POS endpoint. • Expose the current weight—simulated or live—through a simple API payload or intent broadcast so the POS software can pull it in automatically. An APK for quick installation, full Android Studio source, and a concise setup guide are the key deliverables. If you’ve handled serial or BLE peripherals before, this should be fairly straightforward; please highlight any previous scale or POS integrations you have done so I can jump straight into testing.