HID keyboard example and whitelist

[anna]

After disconnecting from chip I can not connect it with the same phone .And the chip will restart when we try to reconnet with the same phone (the phone have been deleted the pairing messages). what may be the problem?Why this will happen ?Could you  explain it clearly to me ? And can you give me a suggestion on how to solve this problem?I have read some similar quetions the other developer asked ,but I still have no idea.Thank you very much .

[Joakim Jakobsen]

Hi!

Quick information about Pairing/Bonding:
Pairing: Devices that are initially connected can exchange encryption keys and encrypt the link. When they have,
the link is secure and they are paired.

Bonding: Paired devices can be bonded. This means that they store the keys that have already been exchanged when
they paired and use those again the next time they connect.

I believe your problem is related to the bond information on the phone being deleted.
When you bond the devices, they store the encryption keys to use the next time they connect. When these keys are deleted
from the phone, your device will try to reconnect to the phone using the old keys, they are no longer present on the phone,
and the connection drops.

You can try to connect your device and your phone, but when you disconnect, don't erase the encryption keys from the phone.
Then you should be able to reconnect.

Please let me know if I misunderstood you in any way, or if you have additional questions.

Cheers,
Joakim.

[anna]

Hi ,Joakim

    Thank you very much for your reply .

    If  I erased the encryption keys from the phone  ,  I couldn't discover the device which was adverting  .I just want to konw  if  I erased the encryption keys from the phone ,how can I  connet the same device again .I know if  I erased the encryption keys the device can't reconnet automatically .And the problem is that is there a way to connet the phone by myself ?

     

Cheers ,

Anna .

[anna]

Hi,Joakim 

   I opened the debug mode ,and there was an error  .

Why this would happen ?

[Joakim Jakobsen]

Hi again!

Normally, if you erase the encryption keys from your phone, you will have to erase the encryption keys from the device you are trying to connect to as well.

But if you have an error somewhere in your code, that should be fixed first.

Could you please tell me which example and which SDK you are working with?
It's hard to tell what exactly caused the error, but I can see that it is an error code 7 (NRF_ERROR_INVALID_PARAM) and that suggests that there is an invalid parameter in there somewhere.
Did you use one of the examples from one of our SDK's and make any modifications to it?

Best regards,
Joakim.

 

[anna]

Hi ,Joakim

     The SDK version is 10.0 and the example is ble_app_hids_keyboard .And I didn't make any modification.And I want to know how to erase the encryption keys from the device .