Hi All,
I am implementing BLE-based FOTA for the application core on an nRF5340 using MCUboot. The update works successfully when using the nRF Connect mobile app, but when I attempt the update using my Python script with Bleak, the firmware does not apply after reboot.
Issue Details:
- The firmware file is sent chunk by chunk over BLE.
- I am not receiving any notifications for data transfer.
- The device does not reboot into the new firmware after the upload.
- Manually rebooting does not apply the update.
- The same firmware file updates correctly using the nRF Connect mobile app.
My Setup:
- Device: nRF5340
- Bootloader: MCUboot
- BLE Library: Bleak (Python)
- Firmware Update Protocol: SMP over BLE
- MTU Size: Detected as 512 bytes
- Chunk Size: 200 bytes
Observations & Debugging Attempts:
- Notifications: Notifications are never received for chunk transfer but got notifications for reading image list attribute.
- Timing: I added small delays (
0.05s) between chunks, but it did not resolve the issue. - Confirm Command: I send an
SMP_IMG_CONFIRMcommand, but the update does not apply. - Manual Reboot: Even after a manual reboot, the new firmware is not active.
- Logging: I have not seen any errors in my Python script, but I suspect the device is not fully processing the uploaded chunks.