Python MQTT

# -*- coding: utf-8 -*-

import paho.mqtt.client as mqtt

MQTTHOST = "139.199.208.33"
MQTTPORT = 1883
USERNAME = ""
PASSWORD = ""
CLIENTID = "SXF_Python_GPSMap"
HEARTBEAT = 60
client = mqtt.Client(CLIENTID)
topic = '/ESP32@PAD'

def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    print("订阅主题 -> %s" % topic)
    client.subscribe(topic)

def on_message(client, userdata, msg):
    MQTT_Rx_Buff = str(msg.payload, encoding="utf-8")
    print(MQTT_Rx_Buff)


def mqtt():
    client.on_connect = on_connect
    client.on_message = on_message
    client.username_pw_set(USERNAME, PASSWORD)
    client.connect(MQTTHOST, MQTTPORT, HEARTBEAT)
    client.publish(topic='/ESP32@PAD', payload='Hello', qos=0)
    # client.loop_forever()  # 阻塞
    client.loop_start()  # 线程


if __name__ == '__main__':
    mqtt()
    while 1:
        pass