AutoPi with Alexa - Receiving MQTT messge failed

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Subject of the issue

I installed Amazon Alexa AVS on my autopi to control my car with my voice.
The Alexa works properly.
And then, I installed paho-mqtt and wrote mqtt client program below. The program works.
It can subscribe to a topic and publish a message to the topic but can not receive any message from mqtt broker. So I checked /etc/iptables/rules.v4 file and add new rule like below.
But message can not still be received from the mqtt broker.
I used port 19418 for mqtt communication.

mqtt client

import os
import configparser
from urllib.parse import urlparse
except ImportError:
from urlparse import urlparse
import paho.mqtt.client as mqtt
import subprocess

Define event callbacks

def on_connect(client, userdata, flags, rc):
print("rc: " + str(rc))

def n_messagoe(client, obj, msg):
print(msg.topic + " " + str(msg.qos) + " " + str(msg.payload))

if int(msg.payload) == 1:
	print("Unknown value")

def on_publish(client, obj, mid):
print("mid: " + str(mid))

def on_subscribe(client, obj, mid, granted_qos):
print("Subscribed: " + str(mid) + " " + str(granted_qos))

def on_log(client, obj, level, string):
#call back
def checker():
print(“callback works”)

client = mqtt.Client()

Assign event callbacks

client.on_message = on_message
client.on_connect = on_connect
client.on_publish = on_publish
client.on_subscribe = on_subscribe

Uncomment to enable debug messages

#client.on_log = on_log

Get CLOUDMQTT settings from config.ini

CONFIG = configparser.ConfigParser()‘config.ini’)


client.username_pw_set(CONFIG_MQTT[‘USER’], CONFIG_MQTT[‘PASSWORD’])

Start subscribe, with QoS level 0

client.subscribe(TOPIC, 0)

Publish a message

client.publish(TOPIC, FIRST_MESSAGE)

Continue the network loop, exit when an error occurs

rc = 0
while rc == 0:
rc = client.loop()
print("rc: " + str(rc))

Your environment

iptables -L -n

ifconfig -a

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Expected behaviour

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Actual behaviour

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