code: public ServiceFuture<CertificateDescriptionInner> getAsync(String resourceGroupName, String resourceName, String certificateName, final ServiceCallback<CertificateDescriptionInner> serviceCallback) {
          return ServiceFuture.fromResponse(getWithServiceResponseAsync(resourceGroupName, resourceName, certificateName), serviceCallback);
      }
docs: Get the certificate.
  Returns the certificate.
  
  @param resourceGroupName The name of the resource group that contains the IoT hub.
  @param resourceName The name of the IoT hub.
  @param certificateName The name of the certificate
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object