'This is called once we have tuned the connection with the server and
called the Connection.Open on the server and it has replied with
Connection.Ok.'

def _on_connection_open(self, method_frame):

    self.known_hosts = method_frame.method.known_hosts
    self._set_connection_state(self.CONNECTION_OPEN)
    self.callbacks.process(0, self.ON_CONNECTION_OPEN, self, self)
