NCS bt_le_scan_start API is limited to report phy and adv detail

[Sam Lin]

Hi Team,

I'm working on scanner and NCS/Zephyr bt_le_scan_start callback API

typedef void bt_le_scan_cb_t(const bt_addr_le_t *addr, int8_t rssi,
uint8_t adv_type, struct net_buf_simple *buf);

The adv_type is too limited to tell

PHY (1M or CODED)

Coded ADV or Coded Scan Response.

1M AE or Legacy.

Is there any way to improve it ?

Thanks,

Sam

[Sigurd]

Hi,

You can register a callback with bt_le_scan_cb_register(), and get all that information.

If you are connecting to the devices, I recommend checking out the NCS Scanning module. We use it in e.g. the central_bas sample. Here you can find all that information in the bt_le_scan_recv_info struct, that is included in the bt_scan_device_info struct. 

/** LE advertisement packet information */
struct bt_le_scan_recv_info {
	/**
	 * @brief Advertiser LE address and type.
	 *
	 * If advertiser is anonymous then this address will be
	 * @ref BT_ADDR_LE_ANY.
	 */
	const bt_addr_le_t *addr;

	/** Advertising Set Identifier. */
	uint8_t sid;

	/** Strength of advertiser signal. */
	int8_t rssi;

	/** Transmit power of the advertiser. */
	int8_t tx_power;

	/** Advertising packet type. */
	uint8_t adv_type;

	/** Advertising packet properties. */
	uint16_t adv_props;

	/**
	 * @brief Periodic advertising interval.
	 *
	 * If 0 there is no periodic advertising.
	 */
	uint16_t interval;

	/** Primary advertising channel PHY. */
	uint8_t primary_phy;

	/** Secondary advertising channel PHY. */
	uint8_t secondary_phy;
};

If you instead want to use the bt_le_scan_cb_register() directly, then you can find an example on how that is used in e.g. the EnOcean subsys(used in the Bluetooth Mesh). See this link.

Snippet:

	static struct bt_le_scan_cb scan_cb = { .recv = adv_recv };

	bt_le_scan_cb_register(&scan_cb);

static void adv_recv(const struct bt_le_scan_recv_info *info,
		     struct net_buf_simple *buf)
{
..
..
}

In adv_recv() you then have the bt_le_scan_recv_info.

See the code example here on how to decode the information in bt_le_scan_recv_info.

[Sam Lin]

Hi Sigurd,

I works for me. Thanks you.

However I cannot get Scan Response from 1M LE AE and Coded devices.

Active scan is used. legacy scan response is fine.

I verify Scan Response with our original scanner to make sue the Scan Response is carried with 1M AE and Coded devices.

Anything missed ?

ps. I can get Scannable ADV with 0 len payload  but I cannot get Scan Response.

BR,

Sam