code: def start_wrap_console(self):
          
          if not self._wrap_console or self._console_type != "telnet":
              return
          remaining_trial = 60
          while True:
              try:
                  (reader, writer) = yield from asyncio.open_connection(host="127.0.0.1", port=self._internal_console_port)
                  break
              except (OSError, ConnectionRefusedError) as e:
                  if remaining_trial <= 0:
                      raise e
              yield from asyncio.sleep(0.1)
              remaining_trial -= 1
          yield from AsyncioTelnetServer.write_client_intro(writer, echo=True)
          server = AsyncioTelnetServer(reader=reader, writer=writer, binary=True, echo=True)
          self._wrapper_telnet_server = yield from asyncio.start_server(server.run, self._manager.port_manager.console_host, self.console)
docs: Start a telnet proxy for the console allowing multiple client
          connected at the same time