mqtt_sub.py

#Base code from https://www.eclipse.org/paho/clients/python/ lifted on 29/4/19

import paho.mqtt.client as mqtt

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print("{}: {}".format(msg.topic, msg.payload.decode("utf-8") ))

client = mqtt.Client()
client.on_message = on_message

host = "dangilsystem.zapto.org"

client.connect(host, 1883, 60)

client.subscribe("callback/block")
print("Subscribed")

# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client.loop_forever()