A sample of MQTT publisher (QoS=0)

mqttpub.py

#!/usr/bin/env python2.7
from __future__ import print_function
import datetime
import time
import paho.mqtt.client as mqtt     # https://pypi.python.org/pypi/paho-mqtt/

topic = "foo/bar"

if __name__ == '__main__':
    client = mqtt.Client(protocol=mqtt.MQTTv311)
    client.username_pw_set('publisher', 'pass')
    client.connect('localhost')

    for i in range(100):
        s = str(datetime.datetime.now())
        print("send message :%s:%s" % (topic, s))
        client.publish(topic, s)
        time.sleep(1)

    client.disconnect()