I wrote a python code to connect to a MQTT Broker, which worked completely fine until I tried working with environment variables. The library used is paho-mqtt.
At first, the broker, port, topic, password and username were declared in the code, and the code worked well. Then, I created a .env file which stores those variables, and now it cannot connect to the broker anymore.
Here's how the python code "loads" the environment variables :
from dotenv import load_dotenv
...
if private_lorawan == True:
load_dotenv('mqtt-private.env') # loads file
broker = os.getenv('BROKER')
port = int(os.getenv('PORT')) # convert in integer
topic = os.getenv('TOPIC')
username = os.getenv('USERNAME')
password = os.getenv('PASSWORD')
Here's the mqtt-private.env file :
BROKER='xxx.xx.xx.xxx' # IP address
PORT=1883
TOPIC="v3/<topic>/devices/<device-eui>/up"
USERNAME="<username>"
PASSWORD="<password>"
And here's the output when running the code :
Connect_mqtt
my-client-0
Loop started
Failed to connect, return code 5
When searching what the return code means :
5 : Connection Refused. The client is not authorized to connect.
I tried :
username and password in double quotes
username and password without double quotes
But none of these options seem to work.
As per the docs:
By default, load_dotenv doesn't override existing environment variables.
USERNAME is set to the login name in many operating systems, so the result you are seeing is to be expected. Solutions include using a different variable name, loading the data into a dict (dotenv_values), and specifying override - load_dotenv(dotenv_path='mqtt-private.env', override=True).