Add a node to the link

        :param dump: Dump project on disk

def add_node(self, node, adapter_number, port_number, label=None, dump=True):
        """
        Add a node to the link

        :param dump: Dump project on disk
        """

        port = node.get_port(adapter_number, port_number)
        if port is None:
            raise aiohttp.web.HTTPNotFound(text="Port {}/{} for {} not found".format(adapter_number, port_number, node.name))
        if port.link is not None:
            raise aiohttp.web.HTTPConflict(text="Port is already used")

        self._link_type = port.link_type

        for other_node in self._nodes:
            if other_node["node"] == node:
                raise aiohttp.web.HTTPConflict(text="Cannot connect to itself")

            if node.node_type in ["nat", "cloud"]:
                if other_node["node"].node_type in ["nat", "cloud"]:
                    raise aiohttp.web.HTTPConflict(text="It's not allowed to connect a {} to a {}".format(other_node["node"].node_type, node.node_type))

            # Check if user is not connecting serial => ethernet
            other_port = other_node["node"].get_port(other_node["adapter_number"], other_node["port_number"])
            if other_port is None:
                raise aiohttp.web.HTTPNotFound(text="Port {}/{} for {} not found".format(other_node["adapter_number"], other_node["port_number"], other_node["node"].name))
            if port.link_type != other_port.link_type:
                raise aiohttp.web.HTTPConflict(text="It's not allowed to connect a {} to a {}".format(other_port.link_type, port.link_type))

        if label is None:
            label = {
                "x": -10,
                "y": -10,
                "rotation": 0,
                "text": html.escape("{}/{}".format(adapter_number, port_number)),
                "style": "font-size: 10; font-style: Verdana"
            }

        self._nodes.append({
            "node": node,
            "adapter_number": adapter_number,
            "port_number": port_number,
            "port": port,
            "label": label
        })

        if len(self._nodes) == 2:
            yield from self.create()
            for n in self._nodes:
                n["node"].add_link(self)
                n["port"].link = self
            self._created = True
            self._project.controller.notification.emit("link.created", self.__json__())

        if dump:
            self._project.dump()