code: public final ListDeviceRegistriesPagedResponse listDeviceRegistries(String parent) {
      ListDeviceRegistriesRequest request =
          ListDeviceRegistriesRequest.newBuilder().setParent(parent).build();
      return listDeviceRegistries(request);
    }
docs: Lists device registries.
  
  <p>Sample code:
  
  <pre><code>
  try (DeviceManagerClient deviceManagerClient = DeviceManagerClient.create()) {
  LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
  for (DeviceRegistry element : deviceManagerClient.listDeviceRegistries(parent.toString()).iterateAll()) {
  // doThingsWith(element);
  }
  }
  </code></pre>
  
  @param parent The project and cloud region path. For example,
  `projects/example-project/locations/us-central1`.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails