multithreading - Thread issue while subscribing to MQTT in Python using Paho MQTT -


i have python program listens mqtt topic , needs process message. specify number of arguments command line evaluate message differently.

import argparse import datetime import json  import paho.mqtt.client mqtt  ### mqtt functions def on_connect(mqttc, obj, flags, rc):     print("connected! - " + str(rc))  def on_message(mqttc, obj, msg):     print(msg.topic+" "+str(msg.qos)+" "+str(msg.payload))  def on_publish(mqttc, obj, mid):     print("published! "+str(mid))  def on_subscribe(mqttc, obj, mid, granted_qos):     print("subscribed! - "+str(mid)+" "+str(granted_qos))  def on_log(mqttc, obj, level, string):     print(string)  if __name__ == "__main__":     # handle args     parser = argparse.argumentparser(         description='this usedin conjunction wifiscanner on raspberry pi')     parser.add_argument('--topic', metavar='base/sub', type=str, nargs='?', help='full topic listen to. (example "proximity/sensor")', default="proximity/#")     parser.add_argument('--host', metavar='url', type=str, nargs='?',                         help='uql of mqtt server.')     parser.add_argument('--graph', metavar='true/false', type=bool, nargs='?', help='whether print data.', default=true)     parser.add_argument('--timeout', metavar='sec', type=int, nargs='?', help='how long device remembered', default=10)     args = parser.parse_args()     # mqtt     mqttc = mqtt.client()     # mqttc.on_message = on_message     mqttc.on_connect = on_connect     mqttc.on_publish = on_publish     mqttc.on_subscribe = on_subscribe     # uncomment enable debug messages     #mqttc.on_log = on_log     mqttc.connect(args.host, 1883, 60)     mqttc.subscribe(args.topic, 0)     # start listen         while true:         print mqttc.loop()

the problem this, can't see easy way pass command line arguments on_message callback. tried using return value of .loop. however, when try exit using ctrl+z (only keyboard interrupt works), not exit mqtt threads , leaves them running.

the documentation , examples don't have example on how handle messages outside on_message callback , how cleanly exit.

so fixing issue appreciated.

thanks in advance

you use userdata argument client() constructor. ends being passed every callback.


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