BLE Connection by verifying thr enryption using ECDH

RE: BLE Connection by verifying thr enryption using ECDH

Einar Thorsrud — Tue, 17 Sep 2024 12:28:33 GMT

Hi Srinivasa,

Most nRF5 SDK 17.x.x samples that support bonding support support LESC (LE Secure Connections is the standard way to do pairing with ECDH). You can serach for the examples and pick any that has a call to nrf_ble_lesc_request_handler() to see how LESC is handled.

PS: I recomend you migrate to SDK 17.1.0 if you want to stay on the nRF5 SDK as that has some important fixes and support the latest revision nRF52832 devices.

Br,

Einar

RE: BLE Connection by verifying thr enryption using ECDH

srinivasa m — Tue, 17 Sep 2024 12:11:56 GMT

Hi Einar

Thanks for the response.

I am using nRFSDK 17.0.1 and how to enable the ECDH for pairing.

Regards,

Srinivasa M

RE: BLE Connection by verifying thr enryption using ECDH

Einar Thorsrud — Mon, 16 Sep 2024 07:10:49 GMT

Hi,

There is no way to exchange two-way data before connecting. But ECDH is the mechanism used in LE Secure Connections, so I assume that is what you are supposed to use? That is supported out of the box in the SDK. If you need an introduction to this I recomend you take a look at Lesson 5 – Security in Bluetooth LE communication of our Bleutooth course on the Nordic DevAcademy.

If the point is that you want to only support LE Secure Connections (key exchange via ECDH) and not legacy pairign, you can add CONFIG_BT_SMP_SC_ONLY=y to your project configuration, as demonstrated by the Bluetooth: Peripheral SC-only sample.