code: def setPollingRate(self, iPollingRate):
          
          print '%s call setPollingRate' % self.port
          print iPollingRate
          try:
              cmd = WPANCTL_CMD + 'setprop NCP:SleepyPollInterval %s' % str(iPollingRate*1000)
              print cmd
              return self.__sendCommand(cmd)[0] != 'Fail'
          except Exception, e:
              ModuleHelper.WriteIntoDebugLogger('setPollingRate() Error: ' + str(e))
docs: set data polling rate for sleepy end device
  
          Args:
              iPollingRate: data poll period of sleepy end device
  
          Returns:
              True: successful to set the data polling rate for sleepy end device
              False: fail to set the data polling rate for sleepy end device