def setKeepAliveTimeOut(self, iTimeOut):
        """set keep alive timeout for device
           has been deprecated and also set SED polling rate

        Args:
            iTimeOut: data poll period for sleepy end device

        Returns:
            True: successful to set the data poll period for SED
            False: fail to set the data poll period for SED
        """
        print '%s call setKeepAliveTimeOut' % self.port
        print iTimeOut
        try:
            cmd = WPANCTL_CMD + 'setprop NCP:SleepyPollInterval %s' % str(iTimeOut*1000)
            print cmd
            return self.__sendCommand(cmd)[0] != 'Fail'
        except Exception, e:
            ModuleHelper.WriteIntoDebugLogger('setKeepAliveTimeOut() Error: ' + str(e))
set keep alive timeout for device
           has been deprecated and also set SED polling rate

        Args:
            iTimeOut: data poll period for sleepy end device

        Returns:
            True: successful to set the data poll period for SED
            False: fail to set the data poll period for SED