How to use the azure-iot-hub.azure.iot.hub.protocol.iot_hub_gateway_service_ap_is20190630.IotHubGatewayServiceAPIs20190630 function in azure-iot-hub

def __init__(self, connection_string):
        """Initializer for a Registry Manager Service client.

        After a successful creation the class has been authenticated with IoTHub and
        it is ready to call the member APIs to communicate with IoTHub.

        :param str connection_string: The IoTHub connection string used to authenticate connection
            with IoTHub.

        :returns: Instance of the IoTHubRegistryManager object.
        :rtype: :class:`azure.iot.hub.IoTHubRegistryManager`
        """

        self.auth = ConnectionStringAuthentication(connection_string)
        self.protocol = protocol_client(self.auth, "https://" + self.auth["HostName"])

def __init__(self, credentials, base_url=None):

        self.config = IotHubGatewayServiceAPIs20190630Configuration(credentials, base_url)
        super(IotHubGatewayServiceAPIs20190630, self).__init__(self.config.credentials, self.config)

        client_models = {k: v for k, v in models.__dict__.items() if isinstance(v, type)}
        self.api_version = "2019-06-30"
        self._serialize = Serializer(client_models)
        self._deserialize = Deserializer(client_models)

        self.service = ServiceOperations(
            self._client, self.config, self._serialize, self._deserialize
        )

def __init__(self, connection_string):
        """Initializer for a Registry Manager Service client.

        After a successful creation the class has been authenticated with IoTHub and
        it is ready to call the member APIs to communicate with IoTHub.

        :param: str connection_string: The authentication information
        (IoTHub connection string) to connect to IoTHub.

        :returns: IoTHubRegistryManager object.
        """

        self.auth = ConnectionStringAuthentication(connection_string)
        self.protocol = protocol_client(self.auth, "https://" + self.auth["HostName"])