Question about ble_app_hids_keyboard example

[Chris_]

Hi, Dear Nordic & all:

  when I run the  ble_app_hids_keyboard example in nrf52820(SDK17.0.2), I meet a question:

1、Frist I use my iphone connect ble device and pair success；

2、Then I remove the ble device and  unbind with my iphone, the device's log  will appear this:

      High Duty Directed advertising -> Fast advertising with whitelist -> Slow advertising with whitelist；

3、I connect to it again with my Iphone, and find it fail to connect；the log & screenshot as below:

screenshot:

log about connecting again:

<info> peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Bonding, error: 133
<info> app: High Duty Directed advertising.
<info> app: Disconnected
<info> app: Fast advertising with whitelist.
<info> app: Slow advertising with whitelist.

4、I also try another phone to connect, and can not connect either;

So, I check the reference document:  Nordic Semiconductor Infocenter， and found step 9 & step 10:

    9、Reset the device while pressing Button 2 to erase bond info. Repeat step 2, and check if the device can send messages to the computer.

    10、Disconnect the device from Windows 8, thereby removing the bond info from the computer. Start a search for Bluetooth devices and observe that while the device is advertising with Whitelist, Windows 8 is not able to discover the device.

Is that mean one device can only connect to one iphone(or PC), if I want another phone(or PC) to connect the same device, should I erase bond and reset? 

Thanks for your kind reply!

[Sigurd]

Hi,

If you delete the bond information on the phone, then you need delete the bond information on the nRF5 as well.

4、I also try another phone to connect, and can not connect either;

Can you post the log-output when this happened?

[Chris_]

Thanks  for your reply!

    I worked out the issue(another phone can not connect) already by disable the whitelist advertise. 

[Chris_]

Hi, Sigurd:

    I have another question about unbind;

    If my device have already  bound 5(max is 7) phone randomly such as A,B,C,D,E, how can I unbind a specific one of them？ for example，now I want unbind phone C, can I implement this ?