Could we stop the ZED being in rejoin backoff？

Hi all

      there is a rejoin logic in HA1.2.2a

      i set the rejoin backoff ：30minutes   and rejoin scan as：3 minutes

       i  want to let  the ZED out of Rejoin back off   when a key press ， i add those code

       if （keypress）

       {

             if(zclVibration_NwkState == DEV_NWK_BACKOFF)
            {
              // set the device rejoining right now
              ZDApp_ChangeState(DEV_NWK_DISC);
              ZDApp_StartJoiningCycle();
              osal_start_timerEx( ZDAppTaskID, ZDO_REJOIN_BACKOFF, zgDefaultRejoinScan );
             }

        }

       sometimes it seems work,  but sometimes it doesn't  make any sense ~~~~

        is that ok  change the device state  in APP ??

BR!