<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def simple_periodic_send(bus):
 """ Sends a message every 20ms with no explicit timeout Sleeps for 2 seconds then stops the task. """

    print("Starting to send a message every 200ms for 2s")
    msg = can.Message(arbitration_id=0x123, data=[1, 2, 3, 4, 5, 6], is_extended_id=False)
    task = bus.send_periodic(msg, 0.20)
    assert isinstance(task, can.CyclicSendTaskABC)
    time.sleep(2)
    task.stop()
    print("stopped cyclic send")