How to use the aioesphomeapi.api_pb2.HelloRequest function in aioesphomeapi

await asyncio.wait_for(coro, 30.0)
        except OSError as err:
            await self._on_error()
            raise APIConnectionError(
                "Error connecting to {}: {}".format(sockaddr, err))
        except asyncio.TimeoutError:
            await self._on_error()
            raise APIConnectionError(
                "Timeout while connecting to {}".format(sockaddr))

        _LOGGER.debug("%s: Opened socket for", self._params.address)
        self._socket_reader, self._socket_writer = await asyncio.open_connection(sock=self._socket)
        self._socket_connected = True
        self._params.eventloop.create_task(self.run_forever())

        hello = pb.HelloRequest()
        hello.client_info = self._params.client_info
        try:
            resp = await self.send_message_await_response(hello, pb.HelloResponse)
        except APIConnectionError as err:
            await self._on_error()
            raise err
        _LOGGER.debug("%s: Successfully connected ('%s' API=%s.%s)",
                      self._params.address, resp.server_info, resp.api_version_major,
                      resp.api_version_minor)
        self._api_version = APIVersion(
            resp.api_version_major, resp.api_version_minor)
        if self._api_version.major > 2:
            _LOGGER.error("%s: Incompatible version %s! Closing connection",
                          self._params.address, self._api_version.major)
            await self._on_error()
            raise APIConnectionError("Incompatible API version.")

import aioesphomeapi.api_pb2 as pb


class APIConnectionError(Exception):
    pass


MESSAGE_TYPE_TO_PROTO = {
    1: pb.HelloRequest,
    2: pb.HelloResponse,
    3: pb.ConnectRequest,
    4: pb.ConnectResponse,
    5: pb.DisconnectRequest,
    6: pb.DisconnectResponse,
    7: pb.PingRequest,
    8: pb.PingResponse,
    9: pb.DeviceInfoRequest,
    10: pb.DeviceInfoResponse,
    11: pb.ListEntitiesRequest,
    12: pb.ListEntitiesBinarySensorResponse,
    13: pb.ListEntitiesCoverResponse,
    14: pb.ListEntitiesFanResponse,
    15: pb.ListEntitiesLightResponse,
    16: pb.ListEntitiesSensorResponse,
    17: pb.ListEntitiesSwitchResponse,