Upload application via BLE

[astronomer]

Hi, I'm trying to create a PC Python script that upload an application on NRF52 via BLE.

I flashed the NRF52 with this S132/DFU/Application: nRF5_SDK_11.0.0_89a8197/examples/ble_peripheral/ble_app_hrs/pca10040/s132_with_dfu. (Application with DFU service)

I created a zip file that contains my application (a simple blink)app_blink_package1.zip

I tried the zip file using the Android App NRFToolbox and it works.

Now I want to upload the hex file nrf52832_xxaa_s132_blinky_500.hex (the same of the zip file) with the PC and BlueZ gatttool using this python script dfu_debug.py

But I can't switch to DFU mode using Gatttool.

I'm following this guide: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk52.v0.9.2%2Fbledfu_appswitching.html but I don't understand what is the command for this operation: "Next, you must write the value 01-XX (where XX is the code for the type of image, see DFU Control Point) to the DFU Control Point to start a DFU procedure" In the Android App NRFToolBox I saw this message on the logcat: (Sending Start DFU command (Op Code = 1, Upload Mode = 4) but I can't recreate it with gatttool.

I'm using this command to enable cccd: char-write-req 0x11 0100 but it replies fail

I tried also nRF5_SDK_11.0.0_89a8197/examples/dfu/bootloader/pca10040/dual_bank_ble_s132/armgcc that is only the DFU. In this way gatttool (via dfu_debug.py above) returns OK for each command, except for the last commands after sending the image file, and at the end of the procedure the application doesn't work. Here the log: log_blink.txt

Where is my mistake? Thanks.

[astronomer]

IT WORKS!!!! github.com/.../ota-dfu-python

Is necessary to send the file dat too and you need to send data in a proper format.

Now I need to find what is the way to go automatically in DFU mode.

[Hung Bui]

@astronomer: I'm glad that it worked now. To let the device enter bootloader mode, you can follow this instruction

[astronomer]

I'm watching this link: infocenter.nordicsemi.com/index.jsp "First, you must write the value 0100 to the CCCD for the DFU Control Point characteristic to enable DFU notifications. " But I don't understand how to retrieve the CCCD handle when I have an application with DFU service, is not 0x10 like just the DFU mode. I'm trying to use the function getHandle in this repo but it doesn't work on my NRF52: github.com/.../dfu.py

[Hung Bui]

@astronomer: If you use Master Control Panel to do a service discovery you should be able to know your CCCD handle ID.

In addition, when you add a characteristic in to your attribute table on the slave with sd_ble_gatts_characteristic_add(), you will receive the ble_gatts_char_handles_t as an output and you can find CCCD handle with that.

[astronomer]

I'm trying Master Control Panel with Iron Python because I should create the same application for Windows: infocenter.nordicsemi.com/index.jsp

But the I had to change something on the code because I think that the script is not allowed to start from /dfu/main.py

[Hung Bui]

@astronomer: For testing, I suggest you first try with the Master Control Panel binary application and make sure you can switch between application and bootloader (also to know which CCCD handle you should write to). Then you can continue to your Iron Python application.