code: def download_object(self, instance, bucket_name, object_name):
          
          url = '/buckets/{}/{}/{}'.format(instance, bucket_name, object_name)
          response = self._client.get_proto(path=url)
          return response.content
docs: Download an object.
  
          :param str instance: A Yamcs instance name.
          :param str bucket_name: The name of the bucket.
          :param str object_name: The object to fetch.