node-red.py

import paho.mqtt.client as mqtt

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))

    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("$SYS/#")
    client.publish ("python", "this took a lot more effort than you might think")
    # publish(topic, payload=None, qos=0, retain=False)

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic+" "+str(msg.payload))

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

# client.connect("iot.eclipse.org", 1883, 60)
client.connect("localhost", 1883, 60)
client.publish ("python", "this took a lot more effort than you might think")



# 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()