https://devzone.nordicsemi.com/f/nordic-q-a/20445/pairing-timeout-setting-timeout-when-initiating-pairingHi We&#39;d like to set the pairing timeout when using the function sd_ble_gap_authenticate(conn_handle, p_sec_params) . The reason for this is that we are setting the connection interval to 4 seconds between two nrf52 devices, and whenever we try to establishen-USTelligent Community 13Wed, 15 Mar 2017 10:41:58 GMThttps://devzone.nordicsemi.com/thread/79709?ContentTypeID=1Wed, 15 Mar 2017 10:41:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c815f213-4a40-4dd5-bc23-aa350718a973Youssif<p>Thank you for your response. I have just checked and found this information in the Bluetooth Specification, Version 5.0, Vol 3, Part H, Section 3.4 - SMP Timeout.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/79708?ContentTypeID=1Wed, 15 Mar 2017 10:33:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2dd1fd3c-8e06-4ae6-bad7-77f0c5f9c2e6run_ar<p>I&#39;m afraid you cannot change this timeout, as the 30 second timer is dictated by the bluetooth core spec.</p> <p>I would recommend that you wait until after you complete the pairing procedure before you update the connection parameters to 4 second intervals.</p><div style="clear:both;"></div>