ble advertizing data update dynamically in the prigram

RE: ble advertizing data update dynamically in the prigram

master.chipset — Sun, 29 Sep 2024 12:02:53 GMT

The BT_DATA_BIG_INFO macro in the nRF Connect SDK is used to define a Bluetooth advertising data structure for broadcasting information about a Broadcast Isochronous Group (BIG). This is part of the Bluetooth LE Audio features, which allow for synchronized audio streaming to multiple devices.

RE: ble advertizing data update dynamically in the prigram

Edvin — Mon, 21 Mar 2022 09:55:38 GMT

Hello,

[quote user="saeed mahvis"]or I should completely change them and define new struct variables compatible with bt_le_ext_adv_create()[/quote]

Disclaimer: I have not used the extended advertisements. Check the input parameters.

Well... With the snippet above, first of all, you are not using sd anywhere, just so you know.

Is there a reason you are using BT_DATA_BIG_INFO? Do you know what it refers to, or did you just take it because it contains the name "BIG"?

If you don't know what it is (I don't), I suggest you stick with the BT_DATA_MANUFACTURER_DATA, which is a field where you can use completely custom data. That may not be the case in "BT_DATA_BIG_INFO".

BR,

Edvin

RE: ble advertizing data update dynamically in the prigram

saeed mahvis — Thu, 17 Mar 2022 09:15:42 GMT

Hi again

Would you please to explain a little more about bt_le_ext_adv_create() usage. Should I still use these lines:

static uint8_t adv_array[29] = {0};

static const struct bt_data ad[] = {
BT_DATA(BT_DATA_BIG_INFO, adv_array, sizeof(adv_array)),
};

// Set Scan Response data //
static const struct bt_data sd[] = {
BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
};

and

bt_enable(NULL);
bt_le_adv_start(BT_LE_ADV_NCONN_IDENTITY, ad, ARRAY_SIZE(ad),0,0);

or I should completely change them and define new struct variables compatible with bt_le_ext_adv_create().

RE: ble advertizing data update dynamically in the prigram

saeed mahvis — Wed, 16 Mar 2022 19:24:38 GMT

Thank you very much. I have tested it and it did work.

RE: ble advertizing data update dynamically in the prigram

Edvin — Wed, 16 Mar 2022 11:11:53 GMT

In order to write completely custom data, I suggest you look into something called manufacturer specific data:

static uint8_t adv_array[4] = {0};

static const struct bt_data ad[] = {
    BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
    BT_DATA(BT_DATA_MANUFACTURER_DATA, adv_array, sizeof(adv_array)),
}

The size can be larger than 4 bytes.

However, updating the adv_array directly wouldn't change the advertisements. You still need to update the advertising data with the updated adv_array whenever you want to update the advertisements.

BR,

Edvin

RE: ble advertizing data update dynamically in the prigram

saeed mahvis — Tue, 15 Mar 2022 18:36:29 GMT

Thank you very much for your guidance. But let me discus another question.

Actually I want to attach the serial port receiving data to ad area field of my advertising device. Should

I use BT_DATA_BYTES()? As far as I tried only static constant data can be used in this function.

How could I change the ad data dynamically in the program.?

RE: ble advertizing data update dynamically in the prigram

Edvin — Tue, 15 Mar 2022 07:55:26 GMT

You can ad a scan response packet in bt_le_adv_start():

int bt_le_adv_start(const struct bt_le_adv_param *param,
		    const struct bt_data *ad, size_t ad_len,
		    const struct bt_data *sd, size_t sd_len);

The parameters *sd and sd_len is the scan response data, which gives you another 31 bytes. If you need even more, then you need to look into bt_le_ext_adv_create(). In fact, you will find a lot of the possibilities by looking at the bluetooth.h file found in NCS\zephyr\include\bluetooth\bluetooth.h.

Best regards,

Edvin

RE: ble advertizing data update dynamically in the prigram

saeed mahvis — Mon, 14 Mar 2022 18:12:25 GMT

I have tested it on my custom board. It worked without the need of using bt_le_adv_stop().

But I have another question yet. I want to use the ble radio in extended mode to be able to

transfer more than just 32 bytes.

Again thank you for your supports.

Best regards,

Saeed

RE: ble advertizing data update dynamically in the prigram

Edvin — Mon, 14 Mar 2022 15:13:13 GMT

Hello,

I have not tested it yet, but there is a function called bt_le_adv_update_data(). I am not sure whether you need to stop the adverting using bt_le_adv_stop() before updating the data or not. Check the return value from bt_le_adv_update to see whether it succeeds without stopping the advertising data.

Best regards,

Edvin