https://devzone.nordicsemi.com/f/nordic-q-a/13703/how-to-create-a-new-128bit-uuid-services-in-the-sdk10-0-ble_app_uart_cI am working in the SDK10.0 ble_app_uart_c(master),it can connect to ble_app_hrs(slave) successfully. But if I add a new 128 bit UUID named ACC_BASE_UUID different from NUS_BASE_UUID.After I power on the master device,it can connect to slave,but theen-USTelligent Community 13Tue, 10 May 2016 10:56:12 GMThttps://devzone.nordicsemi.com/thread/52370?ContentTypeID=1Tue, 10 May 2016 10:56:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8e101971-7e0e-484b-9f82-facb486df677Susheel Nuguru<p>Cannot say much without seeing how youa re calling ble_acc_c_rx_notif_enalbe and what you are doing inside ble_acc_c_rx_notif_enable function.</p> <p>if you are doing exactly same as NUS then it means you have not updated p_ble_acc_c-&gt;conn_handle when your device is connected like NUS did in main.c-&gt;on_ble_evt-&gt;BLE_GAP_EVT_CONNECTED</p> <pre><code>m_ble_nus_c.conn_handle = p_ble_evt-&gt;evt.gap_evt.conn_handle; </code></pre> <p>You need to do the same for your m_ble_acc_c</p> <p>PLUS</p> <p>you need to update the p_ble_acc_c-&gt;nus_rx_cccd_handle when the db_discover_evt_handler discovers the cccd handle.</p><div style="clear:both;"></div>