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()
