https://devzone.nordicsemi.com/f/nordic-q-a/9058/connecting-ble_central_and_peripheral-to-custom-android-apphello, I am working on the example ble_central_and_peripheral in nRF51_SDK_8.1.0_b6ed55f and we have connected the device to MCP and on clicking the enable service we gets the updated notification. We have developed an android app and we could connecten-USTelligent Community 13Mon, 07 Sep 2015 13:26:38 GMThttps://devzone.nordicsemi.com/thread/33359?ContentTypeID=1Mon, 07 Sep 2015 13:26:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4faf39ac-e63a-49d3-8cbc-ecf814a63274Hung Bui<p>Hi Deepu,</p> <p>You can force the peripheral to notify without the write request to the CCCD characteristic using sd_ble_gatts_sys_attr_set() . However, the phone won&#39;t expect this notification and will discard the packets (tested on Android and iOS). In the phone app you won&#39;t receive anything. It worked on the MasterControlPanel on PC though.</p> <p>One question, why don&#39;t you want to send the write command to enable CCCD ? It can be transparent to the end user.</p><div style="clear:both;"></div>