How to send Advertising packet with non-connectable and non-scannable

RE: How to send Advertising packet with non-connectable and non-scannable

Amanda Hsieh — Wed, 05 Feb 2025 14:30:33 GMT

Does it work as you expect?

RE: How to send Advertising packet with non-connectable and non-scannable

James168 — Wed, 05 Feb 2025 08:28:38 GMT

err = bt_le_adv_start(BT_LE_ADV_NCONN, ad, ARRAY_SIZE(ad), NULL, 0);

Using the above statement, got the ADV_NONCONN_IND advertising packet in the wireshark.

RE: How to send Advertising packet with non-connectable and non-scannable

Amanda Hsieh — Tue, 04 Feb 2025 15:48:34 GMT

As I said in the first reply, If you want non-scannable, simply don't add a scan response packet to the advertising. Please remove sd.

RE: How to send Advertising packet with non-connectable and non-scannable

James168 — Tue, 04 Feb 2025 09:54:40 GMT

#define BT_LE_ADV_NCONN_IDENTITY BT_LE_ADV_PARAM(BT_LE_ADV_OPT_USE_IDENTITY, \
						 BT_GAP_ADV_FAST_INT_MIN_2, \
						 BT_GAP_ADV_FAST_INT_MAX_2, \
						 NULL)

To use

BT_LE_ADV_NCONN_IDENTITY as parameter,

	err = bt_le_adv_start(BT_LE_ADV_NCONN_IDENTITY, ad, ARRAY_SIZE(ad), sd,
			      ARRAY_SIZE(sd));

It's ADV_SCAN_IND PDU type in wireshark.

	err = bt_le_adv_start(BT_LE_ADV_NCONN, ad, ARRAY_SIZE(ad), sd,
			      ARRAY_SIZE(sd));

It's also ADV_SCAN_IND PDU type

3) Both are TX AND RX advertising packet,

still can't get TX ONLY advertising packet.

RE: How to send Advertising packet with non-connectable and non-scannable

James168 — Tue, 28 Jan 2025 12:18:56 GMT

Hi,

It's Chinese New Year now, and I will check it when back to the office.

RE: How to send Advertising packet with non-connectable and non-scannable

Amanda Hsieh — Thu, 23 Jan 2025 15:46:54 GMT

It needs BT_LE_ADV_NCONN_IDENTITY to use with BT_LE_ADV_OPT_USE_IDENTITY or you can use BT_LE_ADV_NCONN as this DevAcademy course: https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-2-bluetooth-le-advertising/topic/blefund-lesson-2-exercise-1/.

RE: How to send Advertising packet with non-connectable and non-scannable

James168 — Thu, 23 Jan 2025 06:14:11 GMT

Hi,

1) Non-connectable and non-scannable (ADV_NONCONN_IND): where the device does not need to switch the radio to receiver mode since they do not allow receiving any data, which in turn reduces battery consumption.

It is what I need, TX only and non-RX, you can also see the same situation on the graph on the web.

2) Nordic AI suggests the following parameters, but I can't get the ADV_NONCONN_IND advertising packet in the wireshark, there is not any advertising packet.

===

To make this non-connectable (ADV_NONCONN_IND), you need to modify the `adv_param` as follows:

static struct bt_le_adv_param *adv_param = BT_LE_ADV_PARAM(
BT_LE_ADV_OPT_USE_IDENTITY | BT_LE_ADV_OPT_USE_NAME | BT_LE_ADV_OPT_NO_2M,
BT_GAP_ADV_FAST_INT_MIN_2,
BT_GAP_ADV_FAST_INT_MAX_2,
NULL);

The key here is adding the `BT_LE_ADV_OPT_NO_2M` option, which makes the advertising non-connectable.

Then, start advertising with:

err = bt_le_adv_start(adv_param, ad, ARRAY_SIZE(ad), NULL, 0);

This configuration will set up non-connectable, non-scannable advertising, which corresponds to the ADV_NONCONN_IND type in NCS.

===

RE: How to send Advertising packet with non-connectable and non-scannable

Amanda Hsieh — Wed, 22 Jan 2025 16:12:11 GMT

Hi,

If you want non-scannable, simply don't add a scan response packet to the advertising.

Regards,
Amanda H.