Keyboard multi-pairing does not work.

[ParanBada]

Hello,

I am developing a BLE keyboard. I am using SDK17.1.0 and nRF52840.
The part that is stuck is multi-pairing. I need to develop a function that alternately connects to 3 central devices like Logitech keyboard.
In the meantime, I found the following post(posted by Kenneth) on Nordic Devzone and ported this code to the keyboard source (ble_app_hids_keyboard) of SDK17.1.0 and am testing it using nRF52DK.

https://devzone.nordicsemi.com/f/nordic-q-a/57881/store-custom-application-data-using-peer-manager/234701

The connection to the first device is successful. When I press button 3 on the nRF52DK board, the connection with the first device is disconnected and a new advertisement is made. However, the other central devices do not search and I cannot connect. On the nRF52DK board, the LED clearly blinks and displays Advertise. And when I look at the log through Putty, Fast Advertising and Slow Advertising are displayed. But why is the device not searched for on the new central device?

And I would appreciate it if you could update the main.c in the link above more stably.

Best Regards,

YIM.

[Dustin Huff]

The first device has been successfully connected. The connection with the first device is cut off and a new advertising is created when I click button 3 on the nRF52DK board 

[ParanBada]

Right.
But I can't find the device from another central device and can't connect.

What's the problem? What should I do?

[Kenneth]

Are you using ble_advertising_restart_without_whitelist() here?

Kenneth

[ParanBada]

I am not using ble_advertising_restart_without_whitelist(). I do not know how to use it.

If I look at bsp_event_handler() in the source code, there is ble_advertising_restart_without_whitelist() in "case BSP_EVENT_WHITELIST_OFF".
If I look at bsp_btn_ble.c, it says that button 1 is used to turn off the whitelist.

#define BTN_ID_WHITELIST_OFF 1 /**< ID of button used to turn off usage of the whitelist. */

However, when I press button 1, case BSP_EVENT_WHITELIST_OFF does not occur and there is no response.

I attach the main.c file that I am testing. It works on SDK 17.1.0 and nRF-DK-52840.

After connecting from the first central device, when I press button 3 or 2 on the DK board, the log appears as follows.

<info> app_timer: RTC: initialized.
<info> app: ----- m_button := 2
<info> app: HID Keyboard example started.
<info> app: ----- Button (control gap address): 2
<info> app: ----- Show stored peer id and gap address
<info> app: ----- Peer id: 0 Stored button (can control gap address): 0
<info> app:     m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8
<info> app: Fast advertising with whitelist.                                                                                                      ^C<info> app: Slow advertising with whitelist.

I'm trying to implement a function that allows me to connect to the central device alternately by pressing buttons 1, 2, and 3, like a Logitech keyboard.

I look forward to your help.

6175.main.c

[Kenneth]

You may try to download the nRF5 SDK v15.2 and try the main.c file in the case you linked, this should show better how it's done.

Kenneth