HOW to use direct advertising to connect the central successfully?

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Thu, 16 Aug 2018 02:13:34 GMT

I test nrf52 and surface tablet which system is updated to Windows insiders build. The results is alright. The nrf52 can reconnect with surface via directing advertisement.

Thanks, Kenneth.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Wed, 15 Aug 2018 06:48:18 GMT

OK. I am updating surface tablet's OS to Windows 10 Insider Preview. When it is completed, I will test it.

Thanks.

RE: HOW to use direct advertising to connect the central successfully?

Kenneth — Tue, 14 Aug 2018 13:49:47 GMT

It is an issue in Win 10, so it would be useful if you can test the Windows Insiders build to check if it's fixed.

To answer your question on privacy:

The sd_ble_gap_privacy_set() with privacy mode BLE_GAP_PRIVACY_MODE_DEVICE_PRIVACY might be done after bonding, before advertising again, if the local IRK is transmitted during bonding. It might also be set earlier during initialization (before bonding), but then the devices that do not support privacy will not be able to reconnect when privacy is enabled. So this is not a good workaround I think.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Tue, 14 Aug 2018 06:48:53 GMT

From the central, I can through windows insiders build to change "Central Address Resolution" characteristic?

From the peripheral, I can use BLE_GAP_ADDR_TYPE_RANDOM_PRIVATE_RESOLVABLE type?

Maybe, this issue is in Windows 10 ,so from Windows insiders build I can address this issue. But I didn't find anything about Bluetooth in it.

RE: HOW to use direct advertising to connect the central successfully?

Kenneth — Tue, 14 Aug 2018 06:04:31 GMT

What we notice is that after pairing and using directed advertising to connect to a Windows 10 (Surface Pro) device, the Windows 10 device behaves differently based on a characteristic that reside on the peripheral side ("Central Address Resolution" characteristic). It seems that if Windows 10 discover this characteristic it will trigger an issue as described in my previous reply, this issue occur on the Windows 10 side.

The Central Address Characteristic can't be removed on the peripheral side, as it is mandatory to have it if supported. This means that the fix should be done on the central side to handle this characteristic correctly, in this case Windows 10.

The only way to possible workaround this issue on the peripheral side would be to always enable Privacy.

Please let me know your results after testing Windows insiders build.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Tue, 14 Aug 2018 02:54:43 GMT

So, when nrf52 connect with surface tablet, surface tablet use private address? I can get IRK in BLE_ADV_EVT_PEER_ADDR_REQUEST event to use pm_peer_data_bonding_load() function. But how to use it by direct adv? or in other words, how to change my code?

RE: HOW to use direct advertising to connect the central successfully?

Kenneth — Mon, 13 Aug 2018 12:10:51 GMT

From my understanding they have addressed an issue where they were assuming privacy would be enabled for some devices and thus failed to program both the IRK resolution and the device’s static address to the controller’s offloaded capabilities (on Windows 10).

Please let me know your results after testing.

Best regards,
Kenneth

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Mon, 13 Aug 2018 09:07:44 GMT

Hi. The link you give is latest windows feature and Install Windows 10 Insider Preview. Its content is about PC setting mainly. Does Microsoft prompt which specific aspect may affect reconnection?

RE: HOW to use direct advertising to connect the central successfully?

Kenneth — Mon, 13 Aug 2018 07:39:41 GMT

Hi,

We have got feedback from Microsoft that they are aware of the issue:

"We have a patch that should be in flight for this issue. Are you able to get Windows insiders builds to validate that we have addressed the issue in question?"

Best regards,
Kenneth

RE: HOW to use direct advertising to connect the central successfully?

Kenneth — Tue, 07 Aug 2018 18:08:13 GMT

Hi,

Still working on this issue, have ruled out a few possible differences without any change in behavior. New tests tomorrow.

Kenneth

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Tue, 31 Jul 2018 02:04:31 GMT

OK. Thanks for your reply. I will wait 2 weeks. Then I hope you can tell me the results, because I use SDK v14.2 just leave this question.

RE: HOW to use direct advertising to connect the central successfully?

Hung Bui — Mon, 30 Jul 2018 09:19:15 GMT

Hi,

We are investigating the issue. We suspect a new update on Windows 10 causing this issue. We received several reports from other customers as well.

SDK v11 is pretty old SDK but if you are ok with the features and need to get your project finish quickly you can use SDK v11. But I would suggest to wait for us for 1-2 weeks for our investigation. We are on reduced staff due to summer vacation. So the investigation is quite slow now. We will be back to full staff in 2 weeks.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Mon, 30 Jul 2018 01:22:54 GMT

This SDK v11 can reconnect again with surface 3.I bonded with Surface 3, then I turned OFF and ON Bluetooth on Surface 3. The keyboard example would then reconnect .They can reconnect may by fast adv with whitelist. So ,I think it is right to use direct adv to reconnect again.

The serial doesn't read any data. Maybe some configuration not set. This SDK code doesn't like next SDKs that have config.h . SDK v11 is a watershed. After v11,the structure of code is changed.

Can you change code that after SDK v11 to make it reconnect with surface tablet successfully. If not ,I will use SDK v11 to realize my project.

RE: HOW to use direct advertising to connect the central successfully?

Hung Bui — Fri, 27 Jul 2018 15:09:58 GMT

Hi again,

You can find SDK v11 here: https://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v11.x.x/

Please test with ble_app_hids_keyboard.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Fri, 27 Jul 2018 08:51:41 GMT

I don't find sdk v11 in official website. Our last project use sdk v9 ,s130 and nrf 51 chip. It can work with surface 3 or 4 normally.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Fri, 27 Jul 2018 08:45:08 GMT

I program SDK 12.3 to nrf52.Then use it test with surface3. The phenomenon is the same as above.They cant reconnect with fast adv with whitelist.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Fri, 27 Jul 2018 08:07:15 GMT

OK. I will try it.

RE: HOW to use direct advertising to connect the central successfully?

Hung Bui — Fri, 27 Jul 2018 08:02:25 GMT

Hi Zhixiang,

We are seeing more reports from other customers about the issue. Could you try a test for us to test the board vs Surface 3&4 with the ble_app_hids_keyboard in SDK v11 and SDK v12 as well ?

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Thu, 26 Jul 2018 01:33:50 GMT

OK. I test peripheral with tablet(like Lenovo,CINTIQ ) not with PC. Only surface 3 or 4(win 10) has this issue that peripheral and central cant reconnect with direct adv.

Official example ble_app_hids_keyboard also has this issue when it connect to Surface 3 or 4.When I push butoon1 long time ,The nrf52 board disconnect the Surface .Then via direct adv, fast and slow adv with whitelist , but cant reconnect again.

I think they are the similar question.

RE: HOW to use direct advertising to connect the central successfully?

Hung Bui — Wed, 25 Jul 2018 15:52:10 GMT

Hi,

I'm sorry for the late response. Mr. Kenneth was on vacation. We will continue his investigation and test on the Surface 4.

Do you have any other PC (PC not tablet) running Windows 10 that you can test the issue ?

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Tue, 17 Jul 2018 08:35:09 GMT

Hi,Kenneth . Is it a universal phenomenon that Nrf52 board cannt reconnect surface tablet with direct adv?

How can I solve this question?

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Fri, 13 Jul 2018 07:37:15 GMT

I update my primary content of main.c .You can see the main code following:

1.start fast adv in the BSP_EVENT_ADVERTISING_START event of bsp_event_handler() function.

2.central and peripheral connected, device execute pm_evt_handler(). do BLE_ADV_EVT_PEER_ADDR_REQUEST event in on_adv_evt() function.

3.delete bond in BLE_GAP_EVT_CONNECTED event of ble_evt_handler() function.

4.Then everything work completely.the device go to sleep. If button is pushed, it will execute

directed_valid_peer() function to direct adv.devzone.nordicsemi.com/.../6710.main.c

Can you see something unusual.They cannt reconnect with direct adv.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Fri, 13 Jul 2018 03:52:22 GMT

Hi, Kenneth. Do you recreate it use surface pro 4? The problem is still unresolved.

RE: HOW to use direct advertising to connect the central successfully?

liu_zhixiang — Tue, 10 Jul 2018 02:51:26 GMT

I modify CONN_SUP_TIMEOUT to 1000ms, device also cant reconnect surface 3. I use SDK 14.2.

RE: HOW to use direct advertising to connect the central successfully?

Kenneth — Tue, 26 Jun 2018 08:14:24 GMT

Can you try to modify:

#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(1000, UNIT_10_MS) /**< Connection supervisory timeout (1000 ms). */

Best regards,
Kenneth