RE: Share LTK between two centrals

Chad — Tue, 18 Jun 2019 13:52:01 GMT

Thanks for your response Hung. Very helpful information

RE: Share LTK between two centrals

Hung Bui — Wed, 12 Jun 2019 13:09:25 GMT

Hi Chad,

I don't think it's possible to do step 3 and 4. iOS won't allow the app to access any information regarding the bonding data, neither to use predefined LTK to encrypt a connection. This applied for the mainstream Android OS as well.

If you have full control of the central device, for example if you use the NRF52 as your central, then it's possible what you proposed.

For your application, I would suggest to use your own proprietary method to "pair" phones to a device. Your device may send a challenge packet and your phone need to use a key to calculate the answer to send it back to the device so that the device will accept the phone. Or you can use other encrypting method. By doing this, you may not need your device to be paired (normal pairing) to the phone.