8.4.6 Receive and Update the Firmware

The following are the steps to select the new RNBD350 firmware:

1. Turn on mobile Bluetooth®, and open the MBD application.
2. As shown in the consoletext log, the user must establish a connection from the MBD app.
3. By default, the RNBD350 is programmed to behave in the Data mode, where the device advertises during power-up. The devices that advertise the Bluetooth Low Energy packets are called peripheral devices. Each peripheral device has a unique advertising name. The mobile acts as a Bluetooth Low Energy central device, scans the surrounding Bluetooth Low Energy advertisements and lists all the available devices in the scan list.
4. Tap OTA DFU in the MBD application.
5. Select the RNBD350_XXXX from the scan list (XXXX means the last two bytes of the device BD address).

   

6. The central device (mobile application) now gets connected with the device, and connection-related logs are visible on the tools’ console.

   

7. When connected, tap Select Image to choose the available firmware file. The OTAU firmware image file copied in step 4 is visible on the screen.

   

   Upon selecting the image shown above, the below selection displays.

   

8. After confirmation of the firmware version, click OK to continue.

   

9. The firmware receipt is initiated and displayed in the console log and mobile app, which represents the status of the procedure's progress.

   

   

10. The mobile application and the Microchip Utility Tool display confirmation messages about the successful OTA firmware receipt: “OTA update successful” and “Received complete firmware data”.

    

    

    

11. After successfully receiving the OTA firmware, The Bluetooth Low Energy connection with the MBD app will disconnect and will proceed with the serial DFU update. Click OK in the pop-up dialog.

    

12. During the firmware update, the tool displays the following information:
    • Progress label that displays the percentage of completion
    • Live Progress bar update view
    • Status label that displays the current status
    • Total bytes completed
    • Background update status on console text view

    

13. After completion, the tool updates the following:
    • A Success pop-up window appears that displays the message: “DFU Update Completion!”. Click OK to continue.
    • The progress label indicates: 100%.
    • The status changes to: “DFU Update Complete!”.
    • The bytes completed matches the total bytes.
    • There is a Firmware Distribution Complete message on the console text log.

    

14. After clicking OK, the console text log displays the total time taken for the firmware update along with the “HOST OTA Successful” message.