async fn get_entities(
        &self,
        input: GetEntitiesRequest,
    ) -> Result<GetEntitiesResponse, RusotoError<GetEntitiesError>> {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header("x-amz-target", "IotThingsGraphFrontEndService.GetEntities");
        let encoded = serde_json::to_string(&input).unwrap();
        request.set_payload(Some(encoded));

        let response = self
            .sign_and_dispatch(request, GetEntitiesError::from_response)
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response).deserialize::<GetEntitiesResponse, _>()
    }
<p>Gets definitions of the specified entities. Uses the latest version of the user's namespace by default. This API returns the following TDM entities.</p> <ul> <li> <p>Properties</p> </li> <li> <p>States</p> </li> <li> <p>Events</p> </li> <li> <p>Actions</p> </li> <li> <p>Capabilities</p> </li> <li> <p>Mappings</p> </li> <li> <p>Devices</p> </li> <li> <p>Device Models</p> </li> <li> <p>Services</p> </li> </ul> <p>This action doesn't return definitions for systems, flows, and deployments.</p>
rusoto/services/iotthingsgraph/src/generated.rs