code: public Observable<ServiceResponse<Page<NetworkInterfaceIPConfigurationInner>>> listVirtualMachineScaleSetIpConfigurationsSinglePageAsync(final String resourceGroupName, final String virtualMachineScaleSetName, final String virtualmachineIndex, final String networkInterfaceName) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (virtualMachineScaleSetName == null) {
              throw new IllegalArgumentException("Parameter virtualMachineScaleSetName is required and cannot be null.");
          }
          if (virtualmachineIndex == null) {
              throw new IllegalArgumentException("Parameter virtualmachineIndex is required and cannot be null.");
          }
          if (networkInterfaceName == null) {
              throw new IllegalArgumentException("Parameter networkInterfaceName is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          final String apiVersion = "2017-03-30";
          final String expand = null;
          return service.listVirtualMachineScaleSetIpConfigurations(resourceGroupName, virtualMachineScaleSetName, virtualmachineIndex, networkInterfaceName, this.client.subscriptionId(), apiVersion, expand, this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Page<NetworkInterfaceIPConfigurationInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<NetworkInterfaceIPConfigurationInner>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<NetworkInterfaceIPConfigurationInner>> result = listVirtualMachineScaleSetIpConfigurationsDelegate(response);
                          return Observable.just(new ServiceResponse<Page<NetworkInterfaceIPConfigurationInner>>(result.body(), result.response()));
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Get the specified network interface ip configuration in a virtual machine scale set.
  
  @param resourceGroupName The name of the resource group.
  @param virtualMachineScaleSetName The name of the virtual machine scale set.
  @param virtualmachineIndex The virtual machine index.
  @param networkInterfaceName The name of the network interface.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the PagedList&lt;NetworkInterfaceIPConfigurationInner&gt; object wrapped in {@link ServiceResponse} if successful.