So, I am trying to use rclpy.ok() as follows:

def main(args=None):

     rclpy.init(args=args)

     dynamixel_control = DynamixelControl()

     while rclpy.ok():
          rclpy.spin_once(dynamixel_control)
          dynamixel_control.update_limb_status_temp()

     # rclpy.spin(dynamixel_control)

     dynamixel_control.destroy_node()
     rclpy.shutdown()

     dynamixel_control.__del__()

Now, while running this code, It is expected that one callback will be executed and then update_limb_status_temp() should be called. Which is what happens, but when there is no subscriber callback to execute, then only update_limb_status_temp() function should be called which is not happening? Is there any problem with this way of using this code and should i use other method. I cannot use timer function because I want to run update_limb_status_temp() conditionally. Thanks for the help