code: def add_node(self, node):
          
          self.nodes.append(node)
  
          # add node_ids
          try:
              if node.node_id != b"$stats":
                  self.node_ids.append(node.node_id)
          except NotImplementedError:
              raise
          except Exception:
              print("ERROR: getting Node")
docs: add a node class of HomieNode to this device