Advertising doesn't change name after code update

[Corapche]

Greetings,

I've been developing a DFU firmware that should update the device through Android. The thing is, the device works, but I changed the advertising name, and it still shows the old name when I try to update the device. I use the following function to update the name:

static void make_dev_name(void)
{
    ble_gap_addr_t device_address;
    uint8_t companyName[] = {"M"};
    uint8_t modelName[] = {"1"};
    uint8_t *macAddressName;
    uint8_t macTmp[12];

    sd_ble_gap_addr_get(&device_address);
    macAddressName = Convert_Hex_To_Ascii(&device_address.addr[0], 4);
    memcpy(&DEVICE_NAME[0], companyName, 1);
    memcpy(&DEVICE_NAME[1], modelName, 1);
    memcpy(&DEVICE_NAME[2], macAddressName, 12);

}

Any idea why this issue occurs?

I used reference from here;
https://novelbits.io/ota-device-firmware-update-part-3/

[Vidar Berg]

Hello,

When is make_dev_name() called, is it only on startup, or are you sending a command over BLE to update the name? 

Best regards,

Vidar

[Corapche]

Only on start-up.

int main(void)
{
    bool erase_bonds;
    ret_code_t err_code;
    ble_gap_addr_t device_address;
    
    // Comment this for new modules
    sd_power_dcdc_mode_set(1);

    // Initialize.
    uart_init();
    log_init();

    // Initialize the async SVCI interface to bootloader before any interrupts are enabled.
    err_code = ble_dfu_buttonless_async_svci_init();
    APP_ERROR_CHECK(err_code);

    timers_init();
    buttons_leds_init(&erase_bonds);
    power_management_init();
    ble_stack_init();

    make_dev_name();

    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();

    //if(nrf_gpio_pin_read(WAKEUP_IN_PIN))
    //{
    //    while(1);   // wait here 
    //}

    sd_ble_gap_addr_get(&device_address);
    nrf_delay_ms(5);
    while(!nrf_gpio_pin_read(WAKEUP_IN_PIN))
    {
        //nrf_gpio_pin_clear(UART_TX_NOTIFY);
        //nrf_delay_ms(250);
        //nrf_gpio_pin_set(UART_TX_NOTIFY);
        for(int i=0; i<6; i++)
        {
            do
            {
                err_code = app_uart_put(device_address.addr[i]);
                if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
                {
                    NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
                    APP_ERROR_CHECK(err_code);
                }
            } while (err_code == NRF_ERROR_BUSY);
            
        }
        //nrf_delay_ms(500);
        nrf_delay_ms(50);
    }

    // Start execution.
    //printf("\r\nApplication started.\r\n");
    NRF_LOG_INFO("Debug logging for UART over RTT started.");
    while(app_uart_tx_done());
    app_uart_close();
    advertising_start();

    wdt_init();

    // Enter main loop.
    for (;;)
    {
        // Feed the watchdog
        feed_dog();
        // Power management 
        idle_state_handle();

    }
}

[Corapche]

The device does not advertise with the expected name, it advertises with its' previous name e.g. M0...

We also tried with a different phone that has never been connected to the device, but it still shows the previous name.

[Vidar Berg]

Strange. I replaced the code in the ble_app_uart example in SDK 17.1.0 with your main.c file (also removed the buttonless DFU features) to attempt to reproduce the problem, but I see the full name:

Can you place a breakpoint at the idle_state_handle() and inspect the DEVICE_NAME array to see if it is initialized correctly?

[Corapche]

Unfortunately, I can't debug it because the initial setup wasn't made in Segger. Instead, I'm trying to see what UART is giving me. I will post what when I have some results.

[Vidar Berg]

It's possible to use other tools such as GDB or Segger Ozone to debug the app if the project was built without an IDE.

[Corapche]

I tried to debug it with Ozone, commented log_init() because it got stuck there and now it gets stuck or it crashes on 

ble_dfu_buttonless_async_svci_init(); (line 1041)

[Vidar Berg]

When using Ozone, it is important to select the following checkboxes: 

Otherwise, the softdevice and bootloader will be skipped in the boot sequence. 

Corapche said:

commented log_init() because

What do you use to rebuild the project with?  

[Corapche]

Ok, so I checked those boxes, but now the program doesn't get into the main function when I set a breakpoint.

The debugging is done on NRF52_DK.

[Vidar Berg]

Do you have a bootloader on your device?

[Corapche]

Yes, I merge the following:

1. Generate Settings File from application (a bootloader settings page that contains information about the current DFU process):
nrfutil settings generate \
--family NRF52 \
--application app_file.hex \
--application-version 0 \
--bootloader-version 0 \
--bl-settings-version 2 \
boot_settings.hex

2. Merge Bootloader Settings, Bootloader, Soft Device and Application (to create final application HEX file):

mergehex -m \
boot_settings_file.hex \
secure_bootloader_file.hex \
sXXX_softdevice_file.hex \
app_file.hex \
-o app_uart_0.0.1.hex

Flashing the custom HEX image to your board
3. Program hex file to NRF52 DK

3.1 nrfjprog -f nrf52 --recover
3.2 nrfjprog -f nrf52 --eraseall
3.3 nrfjprog -f nrf52 --program app_file.hex --reset --verify

[Vidar Berg]

For debugging, I recommend creating the settings page with boot validation disabled. 

--app-boot-validation NO_VALIDATION

This will allow the bootloader to boot the app even if the debugger as loaded a slightly different version of the app image.