Bluetooth Observer Parse Advertising Manufacturing Data?

RE: Bluetooth Observer Parse Advertising Manufacturing Data?

mtrobregado — Fri, 31 May 2024 12:29:46 GMT

Hi Vidar,

It worked following the answer in this post below. But, I think I would need to implement filtering.

https://devzone.nordicsemi.com/f/nordic-q-a/86216/no-mfg-data-during-scan-response-when-bt_data_parse

Regards,

Markel

RE: Bluetooth Observer Parse Advertising Manufacturing Data?

Vidar Berg — Fri, 31 May 2024 10:52:24 GMT

Hello Markel,

[quote userid="128695" url="~/f/nordic-q-a/111698/bluetooth-observer-parse-advertising-manufacturing-data/486854"]It is not possible with current code. The call of bt_data_parse() within scan_recv() is only 1 times.[/quote]

I'm not sure I follow. Did you change the callback function to return 'True' on BT_DATA_NAME_COMPLETE as I suggested?

Regards,

Vidar

RE: Bluetooth Observer Parse Advertising Manufacturing Data?

mtrobregado — Fri, 31 May 2024 10:31:30 GMT

Hi Vidar,

It is not possible with current code. The call of bt_data_parse() within scan_recv() is only 1 times. Is there an example program where I can get the advertisement data which includes the manufacturing data.

static void scan_recv(const struct bt_le_scan_recv_info *info,
		      struct net_buf_simple *buf)
{
	char le_addr[BT_ADDR_LE_STR_LEN];
	char name[NAME_LEN];
	uint8_t data_status;
	uint16_t data_len;	

	(void)memset(name, 0, sizeof(name));

	data_len = buf->len;
	bt_data_parse(buf, data_cb, name);
	
	data_status = BT_HCI_LE_ADV_EVT_TYPE_DATA_STATUS(info->adv_props);
   
	bt_addr_le_to_str(info->addr, le_addr, sizeof(le_addr));
	printk("[DEVICE]: %s, AD evt type %u, Tx Pwr: %i, RSSI %i "
	       "Data status: %u, AD data len: %u Name: %s "
	       "C:%u S:%u D:%u SR:%u E:%u Pri PHY: %s, Sec PHY: %s, "
	       "Interval: 0x%04x (%u ms), SID: %u\n",
	       le_addr, info->adv_type, info->tx_power, info->rssi,
	       data_status, data_len, name,
	       (info->adv_props & BT_GAP_ADV_PROP_CONNECTABLE) != 0,
	       (info->adv_props & BT_GAP_ADV_PROP_SCANNABLE) != 0,
	       (info->adv_props & BT_GAP_ADV_PROP_DIRECTED) != 0,
	       (info->adv_props & BT_GAP_ADV_PROP_SCAN_RESPONSE) != 0,
	       (info->adv_props & BT_GAP_ADV_PROP_EXT_ADV) != 0,
	       phy2str(info->primary_phy), phy2str(info->secondary_phy),
	       info->interval, info->interval * 5 / 4, info->sid);
		   
}

I have a working Bluetooth Broadcaster running on nRF52840 DK with advertisement data below.

/* Define and initialize a variable of type adv_mfg_data_type */
static adv_mfg_data_type adv_mfg_data = {COMPANY_ID_CODE, 0x00, 0x00, 0x00, 0x00, 0x00};

static unsigned char url_data[] = { };

LOG_MODULE_REGISTER(Scoreboard, LOG_LEVEL_INF);

static const struct bt_data ad[] = {
	BT_DATA_BYTES(BT_DATA_FLAGS, BT_LE_AD_NO_BREDR),
	BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
	/* Include the Manufacturer Specific Data in the advertising packet. */
	BT_DATA(BT_DATA_MANUFACTURER_DATA, (unsigned char *)&adv_mfg_data, sizeof(adv_mfg_data)),
};

I need to parse this advertisement data at another nRF52840 DK with Bluetooth Observer code running. I already ordered the nRF52840 DK and will arrive next week.

Regards,

Markel

RE: Bluetooth Observer Parse Advertising Manufacturing Data?

Vidar Berg — Fri, 31 May 2024 09:22:38 GMT

Hello Markel,

[quote user=""]At data_cb the set data->type is BT_DATA_NAME_COMPLETE. There is no option to set the data->type to BT_DATA_MANUFACTURER_DATA. That is why I am unable to receive the manufacturer data.[/quote]

The sample you are working on is only looking for the device name, but it should not be a problem to expand it to also look for the BT_DATA_MANUFACTURER_DATA field in the payload. However, you need to return 'true' if the advertisement name is found to continue parsing the payload.

static bool data_cb(struct bt_data *data, void *user_data)
{
	char *name = user_data;
	uint8_t len;

	switch (data->type) {
	case BT_DATA_MANUFACTURER_DATA:
		printk("Found manuf. data\n);
		len = MIN(data->data_len, NAME_LEN - 1);
		memcpy(name, data->data, len);
		name[len] = '\0';
	return false;

	case BT_DATA_NAME_SHORTENED:

	case BT_DATA_NAME_COMPLETE:
		len = MIN(data->data_len, NAME_LEN - 1);
		(void)memcpy(name, data->data, len);
		name[len] = '\0';
		return true;

	default:
		return true;
	}
}

Best regards,

Vidar