https://devzone.nordicsemi.com/f/nordic-q-a/9308/changing-characteristic-security-mode-on-the-flyIs it possible to change a characteristic&#39;s security mode after it&#39;s already been added with sd_ble_gatts_characteristic_add()? I&#39;d like to be able to switch back and forth between &quot;BLE_GAP_CONN_SEC_MODE_SET_OPEN&quot; and &quot;BLE_GAP_CONN_SEC_MODE_SET_ENC_NO_MITMen-USTelligent Community 13Fri, 18 Sep 2015 18:28:33 GMThttps://devzone.nordicsemi.com/thread/34361?ContentTypeID=1Fri, 18 Sep 2015 18:28:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fd7b1d22-5a3b-4d1c-8883-8675a49067a1Chris<p>That&#39;s what I thought. I really only need to do it once and will handle it by resetting the entire device. Thanks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/34360?ContentTypeID=1Fri, 18 Sep 2015 12:57:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c1a87d3b-1cd0-44f1-ac58-2ae1c0d944e2Hung Bui<p>Hi Chris,</p> <p>No, it&#39;s not possible.</p> <p>If you want to change the permission of a characteristic (or modify any properties), you would need to disable the softdevice and reinitialize the whole attribute table (all services and characteristics)</p><div style="clear:both;"></div>