dfu service not getting discovered

[komal]

I have used sofdevice v7.1.0 and nrf51 sdk 6.1.0 the ble_app_hrs project which has support of dfu is not discovering the dfu services. i have enabled the BLE_DFU_APP_SUPPORT flag , then also facing same issue.

[komal]

i have attached the 3 files of mcp screen shot.

1. bootloader.png is the screenshot of normal bootloader.
2. application.png is the screenshot of application i.e ble_app_hrs with dfu support.
3. bootloader2.png is the screenshot of bootloader getting advertised through application after writing 0x0001 to cccd and 0x01 to control point of dfu service to put it into dfu mode. in this services are getting discovered, but after that getting disconneced.

bootloader.png bootloader2.png application.png

[Hung Bui]

@komal: Let me sum up the issue you are having, please correct me if I am wrong:

1. You can program the bootloader, and can use the bootloader to update application (HRM with DFU)
2. When you write 1 to the DFU Control Point, you got a link loss. The link got disconnected without any further DFU update.

This is normal behaviour. MCP v3.7 and SDK v6.1 doesn't support seamless DFU update from application to jump to bootloader and do update automatically. What you need to do is to click back, then do Start Discovery to see if the DFU is advertising, if it is advertising you can connect and do DFU. So 2 more step needed, click back and click start discovery to find the DFU bootloader advertising.

[Hung Bui]

On newer SDK (where you have to update the python code in ble_dfu_send_hex\dfu into C:\Program Files (x86)\Nordic Semiconductor\Master Control Panel\3.7.1.8567\lib\dfu) such as SDK v7.1 the Master Control Panel can do update seamlessly from the dfu buttonless application.

[komal]

no. this is not the issue i am facing. When I write 1 to the DFU Control Point, link loss takes place. Then i click back, the do start discovery and the dfutarg gets advertised. Then i do service discovery, then services get discovered and i get link loss. that means 2nd tme i cant update my firmware.

[Hung Bui]

@komal: It's pretty strange issue. Because you can update the ble_app_hrs_dfu the first time without problem, why didn't it work the second time. Could you provide the Master Control panel log. You can get the log by selectin File -> Log File.

Do you have the same issue if you enter bootloader by holding the BOOT button instead of entering if by writing to the DFU control point ?