Timer Paho MQTT通过重置设置延迟

我尝试使用Paho mqtt在接收到来自使用mqtt的传感器的“关闭”消息后设置延迟，基本上尝试跟踪15分钟内是否没有移动，然后完全关闭灯光。“开启”信息应重置计时器，并在15分钟不移动后关闭

我遇到的问题是，我只收到一次“关闭”消息，直到有人移动到传感器前面，导致“打开”，然后再次“关闭”（一旦他们离开）。因此，我当前的代码不跟踪时间，因为它只在收到消息后运行（使用on_消息回调）。我尝试过线程.Timer，但也遇到了问题，当前代码如下所示

state_on = {"state": "on"}
state_off = {"state": "off"} 
now = time.time() 
print("File running at " + datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))

def on_connect(client, userdata, flags, rc): 
   print("Connected, subscribing to topic...")
   client.subscribe(subscription)


def on_message(client, userdata, msg):
   global now
   print("received message: " ,str(msg.payload.decode("utf-8")))
   # set the time of the last "ON" if it is more than 15 mins ago we turn off
   if "ON" in str(msg.payload.decode("utf-8")):
      now = time.time()
      print("Movement at: " + datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
      client.publish(topic_des, orjson.dumps(state_on))
   else:
      time_passed = time.time() - now
      print("No movement for " + str(time_passed) + ' seconds')    
      if time_passed >= 180.0:
         print('Turning lights off in kitchen... ')
         client.publish(topic_des, orjson.dumps(state_off))

我还看到Asyncio有一个超时函数，但我不确定它是否在这段代码中起作用