What is a typical size for adv_data?

RE: What is a typical size for adv_data?

BenBurch — Wed, 04 Mar 2020 18:50:12 GMT

Well, not sure what was wrong the first time I tired just using expanded data for the advert packer rather than the sr packet, but I made it work.

So, I still don't know how to suppress the advert packet if using expanded data in the sr packet, but I don't need to know that now.

RE: What is a typical size for adv_data?

BenBurch — Tue, 03 Mar 2020 16:18:34 GMT

So I did an experiment to see if I could keep everything in the adv data and select expanded size and see if it applied to that, but I get an NRF_ERROR_NO_MEM when I try to call sd_ble_uuid_vs_add on the first of them. So not quite sure if this shows that approach will not work or if there is some other condition I am missing here.

RE: What is a typical size for adv_data?

BenBurch — Tue, 03 Mar 2020 15:17:21 GMT

It occurs to me to say what I intend to be doing; I have several custom service UUIDs. These are of course too large for the adv packet. I want to send the data using an expanded response packet during the scan response. I am told that I have to not send the adv packet if I am going to use expanded data in the scan response, so I have moved all services to the scan response packet and am attempting to suppress the advertising data.

However, any strategy which will send out all of my service data without running out of space is equally acceptable.

Thanks!

RE: What is a typical size for adv_data?

BenBurch — Tue, 03 Mar 2020 13:39:42 GMT

**@brief Function for initializing the Advertising functionality.
 */

static void advertising_init(void)
{
    ret_code_t             err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;

    init.srdata.name_type                = BLE_ADVDATA_FULL_NAME;     
    init.srdata.include_appearance       = true;
    init.srdata.flags                    = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.srdata.uuids_complete.uuid_cnt  = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids   = m_adv_uuids;
 
//    init.advdata.uuids_complete.uuid_cnt  = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
//    init.advdata.uuids_complete.p_uuids   = m_adv_uuids;
    init.advdata.uuids_complete.uuid_cnt = 0;
    init.advdata.uuids_complete.p_uuids  = NULL;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;

    init.config.ble_adv_primary_phy      = BLE_GAP_PHY_1MBPS;
    init.config.ble_adv_secondary_phy    = BLE_GAP_PHY_2MBPS;
    init.config.ble_adv_extended_enabled = true;

    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

That's it above. Thank you!

RE: What is a typical size for adv_data?

Joakim Jakobsen — Mon, 02 Mar 2020 08:54:23 GMT

I see.

Could you upload your code so I can take a look? If not your entire main.c, the advertising init would be useful.

Regards,
Joakim

RE: What is a typical size for adv_data?

BenBurch — Fri, 28 Feb 2020 15:30:28 GMT

I did look at this. Thing is; I do not have anything in the advdata fields (cnt == 0, address == NULL) already. Is there something additional I need to do to DE-select the use of advdata?

Thanks!

RE: What is a typical size for adv_data?

Joakim Jakobsen — Fri, 28 Feb 2020 14:36:31 GMT

Hi.

Maybe you could look at this previous post:
https://devzone.nordicsemi.com/f/nordic-q-a/38982/scan_rsp-in-extended-advertisement

Best regards,
Joakim

RE: What is a typical size for adv_data?

BenBurch — Thu, 27 Feb 2020 18:25:11 GMT

When I build the template and look at the same call, the value is a much, much more reasonable 0x1d but that is only the default services.