python_mqtt中的publisher 发送message

代码如下

import paho.mqtt.client as mqtt

client_id = 'client_id_63142289'  # 客户端id不能重复

client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION1, client_id)

client.username_pw_set("username", "password")

client.connect("XXX.XXX.com", 1883, 600)

client.publish("topic", "message", qos=1, retain=False)