import paho.mqtt.client as mqtt

import paho.mqtt.publish as publish

auth = {'username':"sender", 'password':"ahQueteiRietufeko8do"}

publish.single("demo", payload="Hello World.", retain=True, hostname="moritzgraf.de",
    port=30024, client_id="knoedel", auth=auth,
    protocol=mqtt.MQTTv5)