code: def add_outbound_connection(self, uri):
          
          LOGGER.debug("Adding connection to %s", uri)
          conn = OutboundConnection(
              connections=self._connections,
              endpoint=uri,
              dispatcher=self._dispatcher,
              zmq_identity=self._zmq_identity,
              secured=self._secured,
              server_public_key=self._server_public_key,
              server_private_key=self._server_private_key,
              future_callback_threadpool=self._future_callback_threadpool,
              heartbeat=True,
              connection_timeout=self._connection_timeout)
  
          self.outbound_connections[uri] = conn
          conn.start()
  
          self._add_connection(conn, uri)
  
          connect_message = ConnectionRequest(endpoint=self._public_endpoint)
          conn.send(
              validator_pb2.Message.NETWORK_CONNECT,
              connect_message.SerializeToString(),
              callback=partial(
                  self._connect_callback,
                  connection=conn,
              ))
  
          return conn
docs: Adds an outbound connection to the network.
  
          Args:
              uri (str): The zmq-style (e.g. tcp://hostname:port) uri
                  to attempt to connect to.