Avoid "Bluetooth pairing request" alert on iOS

[Kasper Leonhardt]

Hi.

I have an application that needs a low security encryption. Therefore I want to use "Just works" encryption. The pairing process is assumed to be in a "safe" place.

But iOS are prompting with the "Bluetooth pairing request" alert before every connection. And I thing that it is very annoying and irrelevant. I can accept the first alert, but not later.

I am using 7.2 softdevice on a nRF 51822.

Is it possible to suppress this message either from the BLE device (or perhaps in the iOS App).

Kasper

[shibshab]

This page describes what parameters needs to be set in order for the peripheral to use Just Works.

When this is used correctly you should not get a prompt from iOS regarding the pairing request.

[Kasper Leonhardt]

Solved. I needed to upgrade to SD 8.0.0, and change the line (last parameter changed to NULL): sd_ble_gap_sec_params_reply(p_ble_evt->evt.gap_evt.conn_handle, BLE_GAP_SEC_STATUS_SUCCESS, &m_application_table[0].sec_param, NULL/&keys_exchanged/); in the file device_manager_peripheral.c

[Kasper Leonhardt]

Did not work. Verified the connection with the Nordic BLE sniffer and Wireshark. The data is not encrypted. Suggestions needed.

[shibshab]

Remember that the sniffer will be able to decrypt just work encryptions automatically. Do you mean that there is no pairing request?

[Kasper Leonhardt]

I know. But Wireshark shows it in plain text, and the encryption flag is false. Please see next answer

[Kasper Leonhardt]

Log from Wireshark:

JustWorksPairingAttempt.pcapng