Extended Advertising Start Issue with PAwR Scanner Role

RE: Extended Advertising Start Issue with PAwR Scanner Role

tesc — Fri, 17 Jul 2026 12:33:21 GMT

Hi,

For understanding what is going on, we need a minimal project which reproduces the issue, along with full list of steps to reproduce.

If you do not want to share that here in a public ticket, then please create a new, private, ticket and share it there.

Regards,
Terje

RE: Extended Advertising Start Issue with PAwR Scanner Role

BEN_HBC — Mon, 13 Jul 2026 05:53:40 GMT

Is Any Solution?

RE: Extended Advertising Start Issue with PAwR Scanner Role

BEN_HBC — Wed, 24 Jun 2026 01:21:43 GMT

-> So, I solved the problem by increasing the count to 10 and rebooting when the -12 error occurred, but this method is still only a temporary fix.

[quote userid="8164" url="~/f/nordic-q-a/128412/extended-advertising-start-issue-with-pawr-scanner-role/568327"]Does the reference counter increase and decrease the normal way, also when you see the issue?[/quote]

-> Yes. when issue occurred, still reference counter is normally increase and decrease.

[quote userid="8164" url="~/f/nordic-q-a/128412/extended-advertising-start-issue-with-pawr-scanner-role/568327"]Is starting the connectable advertiser always failing with -12 NOMEM when synchronized?[/quote]

-> Yes. It depends on the count value, but typically, a -12 error occurs at around count -3. For example, if the count is 10, and you connect after syncing and restart an ad about 7 times, a -12 error will occur thereafter.

[quote userid="8164" url="~/f/nordic-q-a/128412/extended-advertising-start-issue-with-pawr-scanner-role/568327"]Is starting the connectable advertiser always succeeding when not synchronized?[/quote]

-> When only PAwR is enabled and the device is restarted multiple times without syncing, the -12 error does not occur. Additionally, even if you disconnect the device after syncing and then reconnect multiple times to restart the advertisement, no error occurs.

[quote userid="8164" url="~/f/nordic-q-a/128412/extended-advertising-start-issue-with-pawr-scanner-role/568327"]

err = bt_le_ext_adv_update_param(extAdv, &advParam);

What is the full advParam used there?

[/quote]

-> advParam is below.

static struct bt_le_adv_param advParam = {
    .id = BT_ID_DEFAULT,
    .sid = 1,
    .secondary_max_skip = 0,
    .options = BT_LE_ADV_OPT_CONN | BT_LE_ADV_OPT_EXT_ADV,
    .interval_min = ADV_MIN_INTERVAL,
    .interval_max = ADV_MAX_INTERVAL,
    .peer = NULL,
};

The SID value was initially 0, and I thought changing it to 1 might solve the problem, but it didn't work.

RE: Extended Advertising Start Issue with PAwR Scanner Role

tesc — Tue, 23 Jun 2026 15:50:51 GMT

Hi,

Please note that there is functionality in PAwR for connecting with a normal BLE connection between the advertiser and any scanner. Because of that, you may need an additional free connection slot. What confuses me is for this you should need a connection slot as central, not peripheral, but please check anyway if things are working if you increase both CONFIG_BT_CTLR_SDC_PERIPHERAL_COUNT and CONFIG_BT_MAX_CONN by one. You wrote that things were working when increasing those. If increasing them by 1 solves the issue, then I will suggest that as the solution.

If the above did not help, then I would need some more info for looking further into the issue. For clarification, please answer the following questions.

[quote user=""]I checked Log about conn Ref Count. Count is normally increase and reduce when connected and disconnected[/quote]

Does the reference counter increase and decrease the normal way, also when you see the issue?

[quote user=""]after PAwR is Timeout, adv start is fine. but after resynced from Advertiser, restart advertisement return -12 error.[/quote]

Is starting the connectable advertiser always failing with -12 NOMEM when synchronized?

Is starting the connectable advertiser always succeeding when not synchronized?

Regarding the following line:

err = bt_le_ext_adv_update_param(extAdv, &advParam);

What is the full advParam used there?

Regards,
Terje

RE: Extended Advertising Start Issue with PAwR Scanner Role

BEN_HBC — Wed, 17 Jun 2026 06:00:53 GMT

Has anything been done?

RE: Extended Advertising Start Issue with PAwR Scanner Role

tesc — Thu, 11 Jun 2026 21:42:28 GMT

Hi,

I am looking into the issue, but do need some more time. I expect to get back to you either tomorrow or on Monday.

Regards,
Terje