ESP32摩托车头盔HUD固件提示

Write me ESP32 firmware for a motorcycle helmet HUD using a TTGO T-Display. It connects to my phone over Bluetooth Low Energy and displays data the phone sends. Show on screen: 1. Current speed in large numbers. 2. Turn-by-turn navigation arrows from my phone's maps app. 3. Alert banners when the phone sends a "police", "crash", or "hazard" notification. 4. A small battery indicator for the HUD itself. Requirements: - Mirror the text horizontally so it reads correctly through the reflective visor lens. - Keep the screen mostly black so only the bright text reflects and the rest stays invisible. - Big high-contrast fonts for daylight readability. Output one complete Arduino sketch plus the companion phone-side BLE message format. Add comments so I can tune the layout.