docs: def calc_link(self, src_id, src_port, src_port_name, destination):
          """
          Add a link item for processing later
  
          :param int src_id: Source node ID
          :param int src_port: Source port ID
          :param str src_port_name: Source port name
          :param dict destination: Destination
          """
          if destination['device'] == 'NIO':
              destination['port'] = destination['port'].lower()
  
          link = {'source_node_id': src_id,
                  'source_port_id': src_port,
                  'source_port_name': src_port_name,
                  'source_dev': self.node['properties']['name'],
                  'dest_dev': destination['device'],
                  'dest_port': destination['port']}
  
          self.links.append(link)