docs: def setNetworkKey(self, key):
          """set Thread Network master key
  
          Args:
              key: Thread Network master key used in secure the MLE/802.15.4 packet
  
          Returns:
              True: successful to set the Thread Network master key
              False: fail to set the Thread Network master key
          """
          masterKey = ''
          print '%s call setNetworkKey' % self.port
  
          try:
              if not isinstance(key, str):
                  masterKey = self.__convertLongToString(key)
  
                  # prpend '0' at the beginning
                  if len(masterKey) < 32:
                      masterKey = masterKey.zfill(32)
  
                  cmd = WPANCTL_CMD + 'setprop Network:Key %s' % masterKey
                  datasetCmd = WPANCTL_CMD + 'setprop Dataset:MasterKey %s' % masterKey
              else:
                  masterKey = key
                  cmd = WPANCTL_CMD + 'setprop Network:Key %s' % masterKey
                  datasetCmd = WPANCTL_CMD + 'setprop Dataset:MasterKey %s' % masterKey
  
              self.networkKey = masterKey
              self.hasActiveDatasetToCommit = True
              return self.__sendCommand(cmd)[0] != 'Fail' and self.__sendCommand(datasetCmd)[0] != 'Fail'
          except Exception, e:
              ModuleHelper.WriteIntoDebugLogger('setNetworkkey() Error: ' + str(e))