code: def set_server_key(self, zmq_socket, server_secret_key_path):
          '''must call before bind'''
          load_and_set_key(zmq_socket, server_secret_key_path)
          zmq_socket.curve_server = Truf set_server_key(self, zmq_socket, server_secret_key_path):
          '''must call before bind'''
          load_and_set_key(zmq_socket, server_secret_key_path)
          zmq_socket.curve_server = True
docs: must call before bind