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

[James168]

NCS v2.9.0

nRF52832 DK

peripheral_uart sample

"Online Power Profiler for Bluetooth LE" 

 Online Power Profiler for Bluetooth LE 

has a BLE role to send non-connectable, non-scannable packet,

I want to send this kind of advertising packet to test current consumption,

	err = bt_le_adv_start(BT_LE_ADV_NCONN, ad, ARRAY_SIZE(ad), sd,
			      ARRAY_SIZE(sd));
	if (err) {
		LOG_ERR("Advertising failed to start (err %d)", err);
		return 0;
	}

use BT_LE_ADV_NCONN parameter send ADV_SCAN_IND type advertising,

it seems wrong, which parameter of 

bt_le_adv_start()

is correct for non-connectable, non-scannable advertising packet?

[Amanda Hsieh]

Hi, 

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

Regards,
Amanda H.

[James168]

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.

===

[James168]

Hi,

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

[James168]

1) 

#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.

2) 

	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. 

[Amanda Hsieh]

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. 

[James168]

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.

[Amanda Hsieh]

Does it work as you expect?