导入库:导入paho.mqtt.client库,并导入time库用于控制消息发送的间隔时间。 设置MQTT代理服务器信息:包括代理服务器地址、端口号、主题和客户端ID。 定义回调函数:on_connect函数会在客户端成功连接到MQTT代理服务器时被调用。 定义发送消息的函数:publish_message函数会不断发送消息到指定的主题。 主函数: 创建MQTT...
status=result[0]ifstatus ==0:print(f"Send `{msg}` to topic `{topic}`")else:print(f"Failed to send message to topic {topic}")defrun():'''运行发布者'''client=connect_mqtt()#运行一个线程来自动调用loop()处理网络事件, 非阻塞client.loop_start() publish(client)if__name__=='__main_...
print(f"Send `{msg}` to topic `{topic}`") ShareImages[4]='ok' else: ShareImages[4]='error' print(f"Failed to send message to topic {topic}") else: time.sleep(0.001) #msg_count += 1 def runMqtt(ShareImages,lock): client = connect_mqtt() #client = mqtt_client.Client(mqtt_...
MQTT(Message Queuing Telemetry Transport,消息队列遥测传输协议),是一种基于客户端-服务器的消息发布/订阅(publish/subscribe)模式的"轻量级"通讯协议,该协议底层是TCP/IP协议。MQTT最大优点在于,可以以极少的代码和有限的带宽,为连接远程设备提供实时可靠的消息服务。作为一种低开销、低带宽占用的即时通讯协议,使其在...
| 1 | 安装paho-mqtt库 | | 2 | 创建Python文件 | | 3 | 编写连接MQTT服务器和发送消息的代码 | | 4 | 运行Python文件 | 1. 2. 3. 4. 5. 6. 学习之旅 Prepare ConnectMQTTServer Send SendMessage Connect Python to MQTT Server and Send Message ...
print(f"Failed to send message to topic {topic}") msg_count += 1 订阅消息 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。 def subscribe(client: mqtt_client): ...
publish(topic, msg) # result: [0, 1] status = result[0] if status == 0: print(f"Send `{msg}` to topic `{topic}`") else: print(f"Failed to send message to topic {topic}") msg_count += 1 订阅消息 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...
mqttc = mqtt.Client("test") mqttc.on_message = on_message mqttc.on_connect = on_connect mqttc.on_publish = on_publish mqttc.on_subscribe = on_subscribe mqttc.on_log = on_log # 设置账号密码 # mqttc.username_pw_set(username, password=password) ...
self.disconnect_button.clicked.connect(self.disconnect_mqtt) layout1.addWidget(self.disconnect_button) self.send_button = QPushButton('发送数据') # 发送按钮 self.send_button.clicked.connect(self.send_message) self.send_button.setEnabled(False) ...
logging.error("publish: MQTT client is not connected!") time.sleep(1)continueresult=client.publish(TOPIC, msg)#result: [0, 1]status =result[0]ifstatus ==0:print(f'Send `{msg}` to topic `{TOPIC}`')else:print(f'Failed to send message to topic {TOPIC}') ...