app_timer handler not performed in a simple demo

app_timer handler not performed in a simple demohttps://devzone.nordicsemi.com/f/nordic-q-a/28830/app_timer-handler-not-performed-in-a-simple-demoHi, For understanding the app_timer lib, I created a piece of very simple code with SDK 12.3.0 and S132 present, but got some problem with it. My intention is to start a single shoot timer, and start it again when it got expired and toggle a LEDen-USTelligent Community 13Fri, 29 Dec 2017 09:59:24 GMTRE: app_timer handler not performed in a simple demohttps://devzone.nordicsemi.com/thread/114171?ContentTypeID=1Fri, 29 Dec 2017 09:59:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6654801a-3e1d-4ba8-8d59-19b7844584e5Bjørn Kvaale<p>If I were you, I would take a look at the <a href="https://devzone.nordicsemi.com/tutorials/19/">app timer tutorial</a>.</p><div style="clear:both;"></div>RE: app_timer handler not performed in a simple demohttps://devzone.nordicsemi.com/thread/114170?ContentTypeID=1Wed, 27 Dec 2017 15:59:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:58027777-c1c7-4729-bd2c-b17cc7527317SevenZeng<p>Why the code becoming so ugly?</p><div style="clear:both;"></div>