The tablet's app sockets are the only ones bound to the USB link, so the
measurement has to run in the app. tool/linktest_server.py serves the
Orin end and logs every result with its own TCP_INFO. Startable without
touching the screen: am start ... --es linktest <label>.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz
