new_contents: # coding=utf-8
  
  import sys
  import time
  import paho.mqtt.client as paho
  
  
  def on_connect(client, userdata, flags, rc):
      print("MQTT CONNACK received with code %d." % (rc))
      client.subscribe("#")
  
  
  # The callback for when a PUBLISH message is received from the server.
  def on_message(client, userdata, msg):
      msg_data = msg.payload.decode('utf-8')
      print(msg.topic+" "+str(msg_data))
  
  
  client = paho.Client()
  # client.username_pw_set("rpiair", "rpiair")
  client.on_connect = on_connect
  client.on_message = on_message
  client.connect("127.0.0.1", 1883)
  # client.loop_start()
  
  
  def main(arg):
      global client
      try:
          msg = 'Just woke up!'
          (rc, mid) = client.publish("sensor/test", msg, qos=0)
          client.loop_start()
          time.sleep(10)
      except KeyboardInterrupt:
          print("Ctrl-c received, Bye bye!")
          exit()
  
  if __name__ == '__main__':
      main(sys.argv)
  
  
subject: Add very simple MQTT sender setup