I already have a Chinese-manufactured e-writing pad on my desk along with its complete Android SDK and protocol notes. What I now need is a clean, minimalistic Android application that turns the raw pen coordinates coming from the device into smooth, real-time digital ink on the phone screen. Core build • Connect to the pad (the SDK exposes a Bluetooth LE stream). • Capture every pen-down, move and lift event, plot the trace on a canvas, and keep stroke fidelity intact. • Offer three always-visible actions—Next Page, Save File, Upload File—designed as floating buttons that remain functional even when the phone is locked (foreground service / overlay). Function details Next Page: clear the canvas and increment an internal page counter. Save File: render the current page to PNG and store it locally with timestamp naming. Upload File: post the same PNG to a REST endpoint I will supply; a simple multipart upload is enough for now. Workflow I will hand over the pad, the SDK AARs, protocol PDF, and a basic demo project for reference. You wire everything together in Kotlin or Java, keep the UI stark and clutter-free, and return an installable APK plus readable source in Git. Acceptance • Pen strokes replicate one-to-one with the physical writing. • Buttons operate from lock screen without waking the device. • Saved images open correctly in the Photos app and arrive at the test server via Upload. • Code builds cleanly in Android Studio Arctic Fox or newer. Once the prototype performs reliably on my demo device, we can discuss extra polish and multi-page file export, but the above is the milestone I need to hit first.