Retrieving mfg data from a scanned packet

RE: Retrieving mfg data from a scanned packet

Hung Bui — Tue, 19 Dec 2023 09:27:36 GMT

Hi Vignesh,
Sorry that I didn't see that.
Could you try to printout the whole buf to see if the whole data is received by the scan_cb() or not.
Please note that for the function bt_data_parse() in the documentation it says:

* @warning This helper function will consume `ad` when parsing. The user should

* make a copy if the original data is to be used afterwards

/**
 * @brief Helper for parsing advertising (or EIR or OOB) data.
 *
 * A helper for parsing the basic data types used for Extended Inquiry
 * Response (EIR), Advertising Data (AD), and OOB data blocks. The most
 * common scenario is to call this helper on the advertising data
 * received in the callback that was given to bt_le_scan_start().
 *
 * @warning This helper function will consume `ad` when parsing. The user should
 *          make a copy if the original data is to be used afterwards
 *
 * @param ad        Advertising data as given to the bt_le_scan_cb_t callback.
 * @param func      Callback function which will be called for each element
 *                  that's found in the data. The callback should return
 *                  true to continue parsing, or false to stop parsing.
 * @param user_data User data to be passed to the callback.
 */
void bt_data_parse(struct net_buf_simple *ad,
		   bool (*func)(struct bt_data *data, void *user_data),
		   void *user_data);

So maybe it's the reason why you may only see either the name or the mfg data. You need to do a back up of the buf before the first call.

RE: Retrieving mfg data from a scanned packet

Vignesh R — Tue, 19 Dec 2023 03:57:43 GMT

[quote userid="2121" url="~/f/nordic-q-a/106685/retrieving-mfg-data-from-a-scanned-packet/460815"]The advertising packet and the scan packet arrives in the application as separate packets. [/quote]

Do u mean the scan response data??

i dont send any scan response data , i send only the adv. data, as below

#define DEVICE_NAME "Thingy-1"
static uint8_t mfg_data[] = {0xff, 0xff, 0x00};

static const struct bt_data ad[] = {
	BT_DATA(BT_DATA_MANUFACTURER_DATA, mfg_data, 3),
	BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, 8),
};
	
/* Start advertising */
	err = bt_le_adv_start(BT_LE_ADV_NCONN, ad, ARRAY_SIZE(ad),
			      NULL, 0);
	if (err) {
		printk("Advertising failed to start (err %d)\n", err);
		return 0;
	}

the sd is set to NULL.

RE: Retrieving mfg data from a scanned packet

Hung Bui — Mon, 18 Dec 2023 13:04:17 GMT

Hi Vignesh,
The advertising packet and the scan packet arrives in the application as separate packets.
There is no connection between them except that they are from the same advertiser. So what you need to do is to match the advertiser address in each packet so you know which manufacturer data is belong to which advertiser name.