https://devzone.nordicsemi.com/f/nordic-q-a/22635/how-to-restrict-of-accessing-the-services-of-a-ble-profileI am using proximity profile for my custom board as a tracker.I would like to make the services read/write operations accessable only to my andriod app.Others can connect to the tracker app and can see the services available in the device ,But i woulden-USTelligent Community 13Fri, 09 Jun 2017 09:37:19 GMThttps://devzone.nordicsemi.com/thread/89031?ContentTypeID=1Fri, 09 Jun 2017 09:37:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:65bc099e-af9b-420a-a36e-90f80a4cfc32bjorn-spockeli<p>You can set the security mode of the characteristic of your service by using <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s332.api.v2.0.0/group___b_l_e___g_a_p___c_o_n_n___s_e_c___m_o_d_e___s_e_t___m_a_c_r_o_s.html#ga99f7b13b3c63bcaffe700c9f28c3ee3f">BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITM()</a>. This will require the peer to bond with the device in order to write/read the characteristic value.</p><div style="clear:both;"></div>