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DFU over UART

I have custom board with nrf52832. I use latest nrf5 sdk 14. Problem is that when I am connected with SWD and RTT then everything works perfectly. But when I disconnect SWD then pc-nrfutil starts to response. I use bootloader_secure_serial example.

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Traceback (most recent call last):

  File "nordicsemi/__main__.py", line 961, in <module>

    cli()

  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 722, in __call__

    return self.main(*args, **kwargs)

  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 697, in main

    rv = self.invoke(ctx)

  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 1066, in invoke

    return _process_result(sub_ctx.command.invoke(sub_ctx))

  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 1066, in invoke

    return _process_result(sub_ctx.command.invoke(sub_ctx))

  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 895, in invoke

    return ctx.invoke(self.callback, **ctx.params)

  File "/usr/local/lib/python2.7/site-packages/click/core.py", line 535, in invoke

    return callback(*args, **kwargs)

  File "nordicsemi/__main__.py", line 723, in serial

    do_serial(package, port, flow_control, packet_receipt_notification, baud_rate, True)

  File "nordicsemi/__main__.py", line 666, in do_serial

    dfu.dfu_send_images()

  File "/Users/maiduule/Workspace/pc-nrfutil/nordicsemi/dfu/dfu.py", line 122, in dfu_send_images

    self._dfu_send_image(self.manifest.application)

  File "/Users/maiduule/Workspace/pc-nrfutil/nordicsemi/dfu/dfu.py", line 83, in _dfu_send_image

    self.dfu_transport.open()

  File "/Users/maiduule/Workspace/pc-nrfutil/nordicsemi/dfu/dfu_transport_serial.py", line 202, in open

    raise NordicSemiException("No ping response after opening COM port")

pc_ble_driver_py.exceptions.NordicSemiException: No ping response after opening COM port

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