https://devzone.nordicsemi.com/f/nordic-q-a/14238/how-to-stop-gatt-client-reading-characteristic-values-when-on-discovering-servicesI am using Master Control Panel to check some off the shelf BLE product. I noticed that some of them don&#39;t provide characteristic value when I press &quot;discover services&quot;. Where is the setting for only showing the characteristic Declaration but &quot;hidingen-USTelligent Community 13Fri, 03 Jun 2016 06:46:15 GMThttps://devzone.nordicsemi.com/thread/54380?ContentTypeID=1Fri, 03 Jun 2016 06:46:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4e391532-1b09-434b-b1df-b69f0c4fdfa0Petter Myhre<p>It could be several things. Maybe the characteristic value can&#39;t be read, maybe it requires authentication/encryption to be read, maybe it requires authorization to be read.</p> <p>And yes, it has something to do with:</p> <pre><code>ble_gap_conn_sec_mode_t read_perm; /**&lt; Read permissions. */ uint8_t rd_auth :1; /**&lt; Read authorization and value will be requested from the application on every read operation. */ </code></pre> <p>in the ble_gatts_attr_md_t you provide sd_ble_gatts_characteristic_add() when you add the characteristic.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/54379?ContentTypeID=1Wed, 01 Jun 2016 21:30:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9b91d622-d83f-4337-90bf-0128142a03a1Paul<p>Is it something to do with ble_gap_conn_sec_mode_t?</p><div style="clear:both;"></div>