grpc_invoke_arg_stack_async_with_attr_np - Executes an RPC.
  int grpc_invoke_arg_stack_async_with_attr_np(grpc_object_handle_t_np *handle,
                                     char *method_name,
                                     grpc_session_attr_t_np *session_attr,
                                     grpc_arg_stack_t *stack)
  grpc_object_handle_t_np *handle  char *method_name  grpc_session_attr_t_np *session_attr  grpc_arg_stack_t *stackThe grpc_invoke_arg_stack_async_with_attr_np() function calls the method defined by the object handle. The grpc_invoke_arg_stack_async_with_attr_np() function does not wait for the called method to complete execution.
This function is MT-safe.
If successful, the session ID is returned. In the event of an error, -1 is returned.
  GRPC_NOT_INITIALIZED  GRPC_OTHER_ERROR_CODE