M5Stack PaperDIY Complete Kit · avance · Développez un mécanisme de mise à jour sans fil sécurisé utilisant le Bluetooth Low Energy plutôt que le WiFi.
Hardware: PaperDIY, Android/iOS smartphone with BLE Scanner app. 2. Architecture: ESP32-S3 acts as BLE server. Phone is the client. Use PSRAM to assemble the OTA packet in buffer memory before flash write. 3. Code: Implement BLE service with a write characteristic for data chunks and a notification characteristic for status. Handle BLE packet fragmentation (MTU 512). 4. Security: Integrate HMAC signature to validate firmware integrity before writing to the inactive application partition. 5. Commands: Compile OTA bootloader and application. 6. Verification: Send a test firmware from the phone. Verify the system switches correctly to the new partition after reboot. 7. Deep dive: Implement automatic recovery in case of transfer failure and rollback if the new firmware fails to boot correctly.