https://devzone.nordicsemi.com/f/nordic-q-a/8681/ble-pairing-mode-questionBOARD:PCA10028 SDK nRF51_SDK_9.0.0_2e23562 Application is 1/central 8/periphearl Example \examples\ble_central\ble_app_hrs_c &amp; \examples\ble_peripheral\ble_app_hrs this example central &amp; peripheral is auto bonding(if peripheral never bonding) Questionen-USTelligent Community 13Mon, 17 Aug 2015 09:59:26 GMThttps://devzone.nordicsemi.com/thread/31814?ContentTypeID=1Mon, 17 Aug 2015 09:59:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e141f86d-e7a3-4642-89dd-cf9e2ce01e42paul<p>Hi Peter, could you description more detail, i have no idea to do. Thank you!!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/31813?ContentTypeID=1Wed, 12 Aug 2015 12:06:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6819632c-e81f-405c-b5e1-b8c6eba42b1bPetter Myhre<p>The peripheral can only send a security request, please see <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.api.v1.0.0/group___b_l_e___g_a_p___p_e_r_i_p_h___s_e_c___m_s_c.html?cp=2_7_2_1_0_2_1_0_11">this</a>.</p> <p>It is always the central that sends the pairing request, please see <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s130.api.v1.0.0/group___b_l_e___g_a_p___c_e_n_t_r_a_l___p_a_i_r_i_n_g___j_w___m_s_c.html?cp=2_7_2_1_0_2_1_0_23">this</a>.</p> <p>ble_app_hrs doesn&#39;t not send a security request.</p> <p>ble_app_hrs_c sends the pairing request, or calls sd_ble_gap_authenticate(). It is trigger by dm_security_setup_req() in hrs_c_evt_handler. I guess you could use a button to trigger a call dm_security_setup_req() instead.</p><div style="clear:both;"></div>