Connection lost with Android device screen off

Connection lost with Android device screen offhttps://devzone.nordicsemi.com/f/nordic-q-a/20950/connection-lost-with-android-device-screen-offI want my device not to disconnected. I'm trying with custom board with NRF51822AA. I customized NUS example a little. And also I've downloaded NUS example for Android provided by Nordic. The problem is that connection is lost while screen is offen-USTelligent Community 13Thu, 30 Mar 2017 13:42:59 GMTRE: Connection lost with Android device screen offhttps://devzone.nordicsemi.com/thread/81870?ContentTypeID=1Thu, 30 Mar 2017 13:42:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1228e010-940d-4bf5-af00-f7e8b14fe073Hung Bui<p>Which app did you use ? In my case (nRFUART app) it still works in the background as the BLE activity was handled by a service.</p> <p>You can test with nRFConnect or NRFToolbox app also.</p><div style="clear:both;"></div>