The manufacture data in the Ble advertisement was abnormal.

[kenyon]

example：ble_app_uart + secure_bootloader
sdk:17.1

hello.
Well, a strange phenomenon occurred when I was testing the connection between our ble device and the app。

Our app uses p_manuf_specific_data to identify whether to connect.

So we call advertising_init () first and then call  ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST)
to start advertisment.



Then we change the value of m_manuf_specific_data.company_identifier during program work by calling LL_BLE_SetManu(0x0d0d) or LL_BLE_SetManu(0x0f0f)

As a result, all of them are working properly. But when I reboot the device, the company_identifier changes in a strange way.

When I boot up normally, call advertising_init () first, then call LL_BLE_SetManu(0x0d0d) .company_identifier will be setting to 0x0d0d finally.
At this time, I turned the device off for entering sleep, and then turned it back on, so that he called advertising_init () first, and then called LL_BLE_SetManu(0x0f0f) .

company_identifier will change as strange as in the video,I don't know why 0x0d0d appears and don't want it to appear, will the adv data be stored in flash？

What can I do to prevent 0x0d0d from reconnecting my device to my app？


Looking forward to your reply. Thank you

[Jared]

Hi,

When I boot up normally, call advertising_init () first, then call LL_BLE_SetManu(0x0d0d) .company_identifier will be setting to 0x0d0d finally.
At this time, I turned the device off for entering sleep, and then turned it back on, so that he called advertising_init () first, and then called LL_BLE_SetManu(0x0f0f) .

company_identifier will change as strange as in the video,I don't know why 0x0d0d appears and don't want it to appear, will the adv data be stored in flash？

What can I do to prevent 0x0d0d from reconnecting my device to my app？

I don't get it, wouldn't you expect 0x0d0d to be set when it does a reset? You say that you set 0x0d0d initially after a reboot, so that it appears would be expected? 

adv data will not be stored in flash unless you set it explicitly. 

regards

Jared 

[kenyon]

Hi Jared.

Jared said:

At this time, I turned the device off for entering sleep, and then turned it back on, so that he called advertising_init () first, and then called LL_BLE_SetManu(0x0f0f) .

I mean: why does 0x0d0d appear? The right change should be 0x0101 (call advertising_init () )first,then be 0x0f0f(call LL_BLE_SetManu(0x0f0f) ).

0x0d0d should not appear in the beginning，it's not the company_identifier I wanted.
I didn't call 0x0d0d the second time I started, but it came up and it confused me

best regard
kenyon

[Jared]

I think you should set it to something in the start since you advertise when you call advertising_start(), before you change it later with LL_BLE_SetAdManu(),

regards

Jared 

[kenyon]

hi Jared
I initialized its data in advertising_init as you said, but it still didn't solve the problem


Regard
Kenyon

[Jared]

Hi Kenyon,

I see.

I built your project using the bash script and flashed it to my DK with the hope of debugging your project. I press button 4 in the beginning so that the device does not go to sleep, and then press button 2 for it to change the advertising manufacturer data. But the program never enters the LL_BLE_SetAdManu() in the main loop.

I'm trying to reproduce what you shared in the video.

Is there something that I forgot?

Also regarding:

    // 4 bytes version info
    spec_data[0] = 1;
    spec_data[1] = 2;
    spec_data[2] = (unsigned char) ((0x01 & 0xFF00) >> 8);
    spec_data[3] = (unsigned char) ((0xff & 0x00FF) >> 0);

I think the third line should be spec_data[2] = 0x01; Otherwise it would be set to 0x00.

regards

Jared 

[kenyon]

Hi Jared.
I find that the Ble adv time is too short, maybe you can try increasing the APP_ADV_DURATION value or let ble adv continue working when it is idle

In addition, I have a new discovery that this error occurs only when connecting with IOS phones, and does not occur with Android phones

Best regard 
Kenyon

[Jared]

Hi Kenyon,

Can you share the project with the required modification or specify how to make the program starts advertising?

As I've stated, I tried holding button 4 and 2 on start up but it does not enter:

        if(  gatKeyCfg[LL_KEY_NUM_ONOFF  ].normal != LL_GPIO_InputRead(0, 14)  ) { // if key2 pressed
            LL_BLE_SetAdManu(0x010f);        
        }