importpaho.mqtt.clientasmqtt defon_connect(client, userdata, flags, rc): print("Connected with result code "+str(rc)) client.subscribe("test/topic") defon_message(client, userdata, msg): print(msg.topic +" "+str
importpaho.mqtt.clientasmqtt# The callback for when the client receives a CONNACK response from the server.defon_connect(client,userdata,flags,rc):print("Connectedwithresult code"+str(rc))# Subscribing in on_connect() means that if we lose the connection and# reconnect then subscriptions will ...
importpaho.mqtt.clientasmqtt#定义一个on_connect方法defon_connect(client,userdata,flags,rc):returnstr(rc)classIotSubDevViewSet(viewsets.ModelViewSet):#系统启动后,会把SUBSCRIBED状态的设备加入订阅进程definit_subscribe(): iotsubdevs = IotSubDev.objects.all()foriotsubdeviniotsubdevs:try: devices_pk = ...
:param reasonCode:mqttv5.0原因码:reasonCode类的实例:param properties:从代理返回的mqttv5.0属性,对于MQTT v3.1和v3.1.1,未提供属性,但用于兼容性 对于mqttv5.0,官方建议添加properties=None。:return:"""print("Connected with result code: "+str(rc))defon_message(self,client,userdata,msg):"""消息回调...
—在connect()之前设置client的用户名和密码,依据MQTT配置的mqtt_acl与mqtt_user表中的ACL规则与用户信息进行用户验证。 只要MQTT开启了ACL验证, 就必须登录验证。 on_connect( client, userdata, flags, rc ) — 当代理响应我们连接请求时调用 client:客户端对象 ...
def on_message(client, userdata, message): print(“Received message: ” + str(message.payload)) client.on_message = on_message “` 如何在Python中处理MQTT连接中断? 1.添加重连逻辑:当MQTT连接由于网络问题或其他原因中断时,你可以在Python中添加重连逻辑。使用`on_disconnect`方法来设置当连接断开时的自...
Paho MQTT 客户端的自动重连代码如下: FIRST_RECONNECT_DELAY =1RECONNECT_RATE =2MAX_RECONNECT_COUNT =12MAX_RECONNECT_DELAY =60defon_disconnect(client, userdata, rc): logging.info("Disconnected with result code: %s", rc) reconnect_count, reconnect_delay =0, FIRST_RECONNECT_DELAYwhilereconnect_count...
import paho.mqtt.client as mqtt def on_connect(client, userdata, flags, reason_code, properties): '''客户端从服务器接收到 CONNACK 响应时的回调''' print(f"Connected with result code {reason_code}") # 成功连接时 reason_code 值为 Success ...
import paho.mqtt.client as mqtt # 连接的回调函数 def on_connect(client, userdata, flags, rc): print(f"Connected with result code {rc}") client.subscribe("$SYS/#") # 收到消息的回调函数 def on_message(client, userdata, msg):
编写消息回调函数 on_message,该函数将在客户端从 MQTT Broker 收到消息后被调用,在该函数中我们将打印出订阅的 topic 名称以及接收到的消息内容。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 def subscribe(client: mqtt_client): def on_message(client, userdata, msg): print(f"Received `{msg.pa...