BLE - AVDERTISEMENT TYPE legacy

Question

Hi, 
 I am doing the advertisement one second interval and the advertisement mode is in connectable mode. sometimes when i am scanning the beacons there is no uuid bytes in the advertisement not even the major minor bytes only the length of 10 bytes its changing. but i never stopping the advertisement and starting that time , still its changing automatically .

please check is something wrong in this. 
 
 Thanks, 
 Sowmiya

OV_Renesas · Answer

Hi Sowmiya,

Thank you for posting your question online and apologies for the delay.
You have placed this question on the Bluetooth Forum instead of the Bluetooth Low Energy Forum. Let me move this to the BLE Forum.
Regarding the change on the advertising data:
1) Which BLE device are working with? Is it DA14531?
2) Which SDK version are you working with?

If you are using DA14531 and the default ibeacon example (from GitRepo) then it is expected the Advertising Data to change. There is an app_easy_timer that expires after 30 seconds that updates the Advertising Data.

Best Regards,
OV_Renesas

OV_Renesas · Answer

Hi Sowmiya, Thank you for the reply. 
 sowmiya said: One more query from this BLE advertising , can we use the Ibeacon advertisement format with connectable mode ? 
 https://community.renesas.com/wireles-connectivity/f/bluetooth-low-energy/30092/ibeacon-abvertisemt-not-working-in-changing-of-connectable-mode 
 This was the link which i have queried before . is this method is possible now ? 
 The beacon format utilizes all 31 bytes of the Advertising data. This is possible only in non-connectable advertising. If you use connectable advertising you can only use 28 bytes of the Advertising Data (3 bytes are reserved for Flags), this means that you cannot use the beacon formats with Connectable advertising. You can modify the Manufacturer Specific Data and add 28 bytes of custom information there that will resemble the beacon format. You could also try to add the beacon format on the Scan Response Data but only the Centrals that do Active Scan will be able to read them. 
 sowmiya said: da14531 and sdk : 6.0.16.1144 
 DEF_ADV_FOREVER i have sets this type and where is that 30 sec timer that updates data ? 
 Most of our SDK6 examples have an app_easy_timer running that will update the Advertising data. The timer callback looks like this: /**
 ****************************************************************************************
 * @brief Advertisement data update timer callback function.
 ****************************************************************************************
*/
static void adv_data_update_timer_cb()
{
 // If mnd_data_index has MSB set, manufacturer data is stored in scan response
 uint8_t *mnf_data_storage = (mnf_data_index & 0x80) ? stored_scan_rsp_data : stored_adv_data;

 // Update manufacturer data
 mnf_data_update();

 // Update the selected fields of the advertising data (manufacturer data)
 memcpy(mnf_data_storage + (mnf_data_index & 0x7F), &mnf_data, sizeof(struct mnf_specific_data_ad_structure));

 // Update advertising data on the fly
 app_easy_gap_update_adv_data(stored_adv_data, stored_adv_data_len, stored_scan_rsp_data, stored_scan_rsp_data_len);

 // Restart timer for the next advertising update
 app_adv_data_update_timer_used = app_easy_timer(APP_ADV_DATA_UPDATE_TO, adv_data_update_timer_cb);
}
 Please check if the app_easy_gap_update_adv_data API is being called inside your code. Best Regards, OV_Renesas