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  • Case ID: 320620
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Issue with nRF Connect and DFU service support for BT4 and BLE 5

Shreya J B

Hello Nordic Semiconductor Support Team,

We are trying to update application using DFU. We use bootloader, BLE 5 long range coded phy. DFU is not successful, please find the details of the log message in the attachment. we are using nRF Connect version 4.27.1, Nordic SDK version 16, and soft device 140.

Could you please provide guidance on how to resolve this issue or if there are any updates or workarounds available for nRF Connect that support DFU service for BLE 5?

Thank you for your assistance.

Best regards,

Shreya

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  • 0

    Hi Shreya, 

    What I can see in the log is that after nRF Connect app send the command to switch the device to bootloader mode, it's failed to reconnect or having trouble when sending write command after connected to the bootloader. 

    Do you have the issue if you do 1Mbps PHY in your application? 
    Did you modify the bootloader to use CODED PHY or the bootloader still do 1Mbps PHY ?
    Could you try to switch the application to bootloader manually (write 0x01 to the Buttonless characteristic after enable Indication). The bootloader will start advertising as DFUTarg and then you can connect to the bootloader from the phone and do DFU update. 

    Please try capture a sniffer trace when the bootloader is connected to the phone. 

  • 0 in reply to Hung Bui

    Hi Hung Bui,

    Do you have the issue if you do 1Mbps PHY in your application? :
    Our application works ok for 1Mbps. Sorry didn't get your question, can you give more details about the question.

    Did you modify the bootloader to use CODED PHY or the bootloader still do 1Mbps PHY ?
    We have modified the bootloader to advertise in BLE 5 coded PHY

    try capture a sniffer trace when the bootloader is connected to the phone:
    I have used the USB where the debugger is connected, getting erorr -> nRF Sniffer extcap pipe gives error FIFO does not exist. I checked if the com port exists and it generates some data, and it does do something. I checked by using USB port near to reset button. but then nrfSniffer interface was not visible. 

    Could you please suggest how to proceed?!.

    Thank you

  • 0 in reply to Hung Bui

    Hi Hung Bui,

    Actually it is taking time to do DFU from our app. it would be helpful if it is supported in nrf connect.

    Thank you,

    Shreya

  • 0 in reply to Shreya J B

    Hi Shreya, 
    Have you tried the nRF DFU app, maybe it doesn't have the same problem ? 

    Could you show how you modified the bootloader to do CODED PHY advertising ? 
    Have you made sure you don't change the address of the bootloader ? There is a mechanism in the bootloader so that it will be either the same address as the application or increase the application address by 1. 
    Also another question is that wouldn't it be better with non-CODED PHY when doing DFU ? CODED PHY has much lower throughput compare to 1 or 2MBps and the end user quite often is close to the device when doing DFU. 

  • 0 in reply to Hung Bui

    Hi Hung Bui,

    I have tried doing DFU with nRF DFU app, even it has same problem. I have attached screenshot for your reference. currently we are updating the firmware by entering into bootloader manually. but only some mobile phones support this feature. 

    Thanks for the support.
    Shreya

  • 0 in reply to Shreya J B
    Shreya J B said:
    but only some mobile phones support this feature. 

    There are still many phones that don't support CODED PHY. Is the plan to always perform DFU with CODED PHY, and in that case, is it ok that DFU won't be supported for all phones? Also, is the main app using coded PHY as well?

  • 0 in reply to Vidar Berg

    Hi Vidar,

    Vidar Berg said:
    There are still many phones that don't support CODED PHY

    Yes, even we are searching for latest low-cost mobile phone which support this feature. In nrfconnect Device information it is provided that it supports but, in some phones it shows the list of devices advertising in BLE5 but not able to connect.

    Vidar Berg said:
    Is the plan to always perform DFU with CODED PHY, and in that case, is it ok that DFU won't be supported for all phones?

    Most of the times we will perform DFU with CODED PHY. it's okay if doesn't support all the phones. can we get to know exactly which phones support DFU with CODED PHY. 
    I have checked the previous posted queries regarding phones supporting CODED PHY. Those all are of more than 3 years. we are looking for latest phones.

    Thank you,
    Shreya

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  • 0 in reply to Vidar Berg

    Hi Vidar,

    Vidar Berg said:
    There are still many phones that don't support CODED PHY

    Yes, even we are searching for latest low-cost mobile phone which support this feature. In nrfconnect Device information it is provided that it supports but, in some phones it shows the list of devices advertising in BLE5 but not able to connect.

    Vidar Berg said:
    Is the plan to always perform DFU with CODED PHY, and in that case, is it ok that DFU won't be supported for all phones?

    Most of the times we will perform DFU with CODED PHY. it's okay if doesn't support all the phones. can we get to know exactly which phones support DFU with CODED PHY. 
    I have checked the previous posted queries regarding phones supporting CODED PHY. Those all are of more than 3 years. we are looking for latest phones.

    Thank you,
    Shreya

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