尝试通过MQTT发送一条消息，并休眠5秒

import time
import paho.mqtt.client as mqtt

# 连接参数
broker = "mqtt.tencentcloudmqtt.com"
port = 1883
username = "your_username"
password = "your_password"

# 消息内容
topic = "your_topic"
message = "Hello, MQTT!"

# 连接回调
def on_connect(client, userdata, flags, rc):
    print("Connected: " + str(rc))
    client.subscribe(topic)  # 订阅主题

# 发布回调
def on_publish(client, userdata, mid):
    print("Message published")

# 创建客户端
client = mqtt.Client()
client.username_pw_set(username, password)  # 设置用户名和密码
client.on_connect = on_connect
client.on_publish = on_publish

# 连接服务器
client.connect(broker, port, 60)

# 发布消息
client.publish(topic, message)

# 断开连接
client.disconnect()

# 休眠5秒
time.sleep(5)