MQTT Broker Connection Refused Error in Python - python-3.x

Question

I have been trying to connect to broker port 1884. But it gets every time connection refused error.
def __init__(self, host='127.0.0.1', port=8080, broker_address='127.0.0.1', broker_port=1884, start_config=None):
self.app = Bottle()
"""Create the http service app"""
self.broker = SimpleBroker(address=broker_address, port=broker_port)
self.broker.start()
"""Create and run the broker (broker always runs as a daemon)"""
self.brokerAddress = broker_address
"""address of the API broker - usually identical to own address, but others for testing"""
self.mqttc = Client()
"""mqtt client for publishing messages to API broker - delivered to edge and preprocessing layer"""
self.mqttc.connect(host=broker_address, port=broker_port)
"""connect to the broker upon startup"""
and then the execution part:
if __name__ == "__main__":
myAPI = APIServer('127.0.0.1', 8080, '127.0.0.1', start_config='all wheels')
myAPI.start()
The error message:
Traceback (most recent call last):
File "/root/PycharmProjects/Thesis2019/API/APIServer.py", line 328, in <module>
myAPI = APIServer('127.0.0.1', 8080, '127.0.0.1', start_config='all wheels')
File "/root/PycharmProjects/Thesis2019/API/APIServer.py", line 42, in __init__
self.mqttc.connect(host=broker_address, port=broker_port)
File "/root/PycharmProjects/Thesis2019/venv/lib/python3.6/site-packages/paho/mqtt/client.py", line 839, in connect
return self.reconnect()
File "/root/PycharmProjects/Thesis2019/venv/lib/python3.6/site-packages/paho/mqtt/client.py", line 962, in reconnect
sock = socket.create_connection((self._host, self._port), source_address=(self._bind_address, 0))
File "/usr/lib/python3.6/socket.py", line 724, in create_connection
raise err
File "/usr/lib/python3.6/socket.py", line 713, in create_connection
sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused
On the other hand when i execute it in debug mode, i got :
[2019-04-09 23:43:05,243] :: WARNING :: hbmqtt.broker.plugins.topic_taboo :: 'topic-check' section not found in context configuration
[2019-04-09 23:43:05,243] :: INFO :: transitions.core :: Exited state new
[2019-04-09 23:43:05,244] :: INFO :: transitions.core :: Entered state starting
[2019-04-09 23:43:05,248] :: INFO :: hbmqtt.broker :: Listener 'default' bind to 127.0.0.1:1884 (max_connections=100)
[2019-04-09 23:43:05,248] :: INFO :: transitions.core :: Exited state starting
[2019-04-09 23:43:05,248] :: INFO :: transitions.core :: Entered state started
Additional to all the connection refused part, it just starts it without problem in debug mode i guess?
The Pycharm is launched with root privilege.
Firewall is checked, and it is disabled.
None of these ports are open, checked it with lsof.
I use Python 3.6, hbmqtt 0.9.5
It works on Windows, but not on Mac or Linux
Why i have connection refused error each time i try to execute it ? What am i missing?
Thanks in advance for the ideas.

Answer 1

The solution is:
The Mosquitto default port connection is set to 1883 in the config file, where I was trying to connect through port 1884.
I thought that, this properties are set whenever you change the number. Which is not correct since they are static. not changing dynamically.(sure there is a way too.)
Apart from that, the API Broker and Broker port numbers have to be swapped. I don't know why but windows can bind on top of it without problems. but Mac OS and Linux are throwing Connection Refused error.
The Pycharm is launched with root privilege.
Firewall is checked, and it is disabled.
None of these ports are open, checked it with lsof.
Check config file of the Mosquitto, if the allow_annoymous is True
Control your port connections 10 times.
These are still valid check before going crazy. %90 of the problems are caused because of one of these issues.
If you have further help or questions, you can comment in here and I will try to help for future inquiries.