def main(): """start mqtt server and subscribe the topic""" # check the number of arguments if len(argv) != 6: print "usage: %s [hostname] [port] [keepalive] [client_id] [topic]" % argv[ 0] exit(1) try: mqtt_client = Mosquitto(argv[4]) # set callback mqtt_client.on_message = cb_on_message # connect to MQTT broker # client.connect(hostname, port=1883, keepalive=60) mqtt_client.connect(argv[1], argv[2], int(argv[3])) # subscribe the topic mqtt_client.subscribe(argv[5]) print "%s subscribing topic '%s' from %s:%s" % (argv[4], argv[5], argv[1], argv[2]) while True: # call loop method frequently # client.loop(timeout=-1); 0 to return immediately; -1 to return # after 1 second. result = mqtt_client.loop() if result != 0: # rc != 0; loop failed print "Loop failed (%s), disconnecting..." % result mqtt_client.disconnect() break except KeyboardInterrupt: # disconnect from the broker mqtt_client.disconnect() print "Disconnected..."
collection = [ get('Bid'), get('Ask'), get('High'), get('Low'), get('Direction'), get('Last'), ] message = '/'.join( (c[0].childNodes[0].nodeValue for c in collection)).encode('utf-8') print message if dates.get(symbol, None) != collection[-1]: mq.publish('rates/%s' % symbol, message, qos=1, retain=True) dates[symbol] = collection[-1] if __name__ == '__main__': args = parser.parse_args() mq = Mosquitto('fxrates') mq.connect(args.hostname, args.port, 60) try: while True: sleep(.1) getFXRate(mq) except KeyboardInterrupt: print 'closing...' mq.disconnect()