pub-master/EchoRat ? reverse-engineered prompt

Build me a simple Android remote device management demo for authorized testing on devices I own.

I want a backend server, a web dashboard, and an Android app that connects to it and sends basic telemetry like device name, battery, network status, and location when permission is granted. The dashboard should let me see connected devices in real time, open a device detail page, view the latest activity, and browse a limited file list from a test folder on the phone. Please make the UI clean and modern, and let me manage multiple devices at once.

The Android app should run reliably in the background only with clear user permission, auto reconnect if the connection drops, and show obvious indicators that it is active. If you need current docs or best practices, look them up online first.