code: public Observable<Page<EventHubConsumerGroupInfoInner>> listEventHubConsumerGroupsNextAsync(final String nextPageLink) {
          return listEventHubConsumerGroupsNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<EventHubConsumerGroupInfoInner>>, Page<EventHubConsumerGroupInfoInner>>() {
                  @Override
                  public Page<EventHubConsumerGroupInfoInner> call(ServiceResponse<Page<EventHubConsumerGroupInfoInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Get a list of the consumer groups in the Event Hub-compatible device-to-cloud endpoint in an IoT hub.
  Get a list of the consumer groups in the Event Hub-compatible device-to-cloud endpoint in an IoT hub.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;EventHubConsumerGroupInfoInner&gt; object