How and where to send a SERVICE CHANGED indicate?https://devzone.nordicsemi.com/f/nordic-q-a/16059/how-and-where-to-send-a-service-changed-indicateI want to send a service changed indicate after upgrading app by dfu.I know dfu already so that,but i don&#39;t know that how dfu do that. there is service_change_indicate function in dfu,but it seems not be called . anybody knows how to do ? enven-USTelligent Community 13Fri, 02 Sep 2016 10:58:15 GMTRE: How and where to send a SERVICE CHANGED indicate?https://devzone.nordicsemi.com/thread/61247?ContentTypeID=1Fri, 02 Sep 2016 10:58:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:37f1112a-2574-49d7-ba50-4847836327c3sun<p>Thanks. I find service_change_indicate() is called in LE_GAP_EVT_CONN_SEC_UPDATE event. IS_SRVC_CHANGED_CHARACT_PRESENT is already set to 1.</p><div style="clear:both;"></div>RE: How and where to send a SERVICE CHANGED indicate?https://devzone.nordicsemi.com/thread/61246?ContentTypeID=1Tue, 30 Aug 2016 08:38:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:275f8136-9864-46d0-97d7-711b617db156Hung Bui<p>Hi Sun,</p> <p>It&#39;s called. You can find we called service_change_indicate(); in BLE_GAP_EVT_CONN_SEC_UPDATE event in on_ble_evt() in dfu_transport_ble.c.</p> <p>Basically we will send service changed indication after the link is re-encrypted. In service_change_indicate() we tried to re-establish the system attribute (the CCCD values) before we send the indication.</p> <p>Note that you need to make sure you set IS_SRVC_CHANGED_CHARACT_PRESENT to 1</p><div style="clear:both;"></div>