FUOTA(Firmware update over the air) of Nordic controller NRF52840 using Azure as host.

Question

I want to perform FUOTA(Firmware update over the air) for my Nordic controller NRF52840 using Azure as host. 
 Please suggest how to do this .

Einar Thorsrud · Accepted Answer

I see. There could be another issue. Referring to dfu_transport_serial.py and this code: 
 def __ensure_bootloader(self):
 lister = DeviceLister()

 device = None
 start = datetime.now()
 while not device and datetime.now() - start < timedelta(seconds=self.timeout):
 time.sleep(0.5)
 device = lister.get_device(com=self.com_port)

 if device:
 device_serial_number = device.serial_number

 if not self.__is_device_in_bootloader_mode(device):
 retry_count = 10
 wait_time_ms = 500

 trigger = DFUTrigger()
 try:
 trigger.enter_bootloader_mode(device)
 logger.info("Serial: DFU bootloader was triggered")
 except NordicSemiException as err:
 logger.error(err)


 for checks in range(retry_count):
 logger.info("Serial: Waiting {} ms for device to enter bootloader {}/{} time"\
 .format(500, checks + 1, retry_count))

 time.sleep(wait_time_ms / 1000.0)

 device = lister.get_device(serial_number=device_serial_number)
 if self.__is_device_in_bootloader_mode(device):
 self.com_port = device.get_first_available_com_port()
 break

 trigger.clean()
 if not self.__is_device_in_bootloader_mode(device):
 logger.info("Serial: Device is either not in bootloader mode, or using an unsupported bootloader.")

 def __is_device_in_bootloader_mode(self, device):
 if not device:
 return False

 # Return true if nrf bootloader or Jlink interface detected.
 return ((device.vendor_id.lower() == '1915' and device.product_id.lower() == '521f') # nRF52 SDFU USB
 or (device.vendor_id.lower() == '1366' and device.product_id.lower() == '0105') # JLink CDC UART Port
 or (device.vendor_id.lower() == '1366' and device.product_id.lower() == '1015'))# JLink CDC UART Port (MSD)
 
 You can see that nrfutil looks at the USB vendor ID to check if the device is in DFU mode, and if not it attempts to trigger DFU mode (that only works via the nRF52840's USB interface though). If you are not using a J-Link debugger as USB-UART bridge nrfutil will assume the device is not in DFU mode. So you either need to use a different debug probe, or (probably more relevant), modify __is_device_in_bootloader_mode.

FUOTA(Firmware update over the air) of Nordic controller NRF52840 using Azure as host.

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