BLE connection with pin code

[Roei]

Hi,

I'm using NRF52840 in order to connect to a mobile device, with PIN code.

Connection to Android is ok. The issue is with IOS.

IOS can't send the PIN code to my device, I understand that NRF device should transmit it's services so IOS will read it before sending the PIN code. Am I right?

Thanks!

[Roei]

I will give some more details.

When start advertising via nrf device and trying to connect via nrf connect app - I have the pin code window on my android mobile, but not on my IOS mobile. I understand that in IOS it's different, as I need to transmit my services in order to make it happen in IOS.

Am I right?

[run_ar]

iOS will wait with pairing until you try to read/write to a characteristic that requires a higher security level. Did you try to enable notification for one of the characteristics? If that does not trigger pairing it means you need to increase the security level for your characteristics.

[Roei]

Hi,

Thanks for your response!

Who should try to read/write to a characteristic with higher security level? The mobile?

Where should I enable notification or increase security level? On NRF device side or mobile side?

Can you please give me an example?

Thanks!

[run_ar]

Hi,

If you look at the heart rate example in the sdk. this will send and incufficient authentication error to the phone once the iPhone tries to write to the cccd of the heart rate characteristic. this causes the iphone to start the pairing process.

So the phone will need to try to write to a characteristic in one of the peripherals services. So configure security on the peripheral. For details on how to configure the characteristics please take a look at our tutorial section here: https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy

[Roei]

Hi,

Thanks for your help!

Right now, I'm using sd_ble_gatts_characteristic_add(), in order to add RX, TX and device information service. Read and write permissions are BLE_GAP_CONN_SEC_MODE_SET_LESC_ENC_WITH_MITM.

Is that good enough? Do I need to add more characteristics with another security level, in order to make the IOS trying to read and initiate pairing process?

Thanks!