I am trying to set up paho-mqtt on a Raspberry Pi Zero 2W on my home network, to communicate with Home Assistant. I have already set up a MQTT broker on Home Assistant via Mosquitto.
The Python script I’m using to test connection looks like this:
GNU nano 7.2 pubSubPi.py
# test_connect.py
import paho.mqtt.client as mqtt
# The callback function. It will be triggered when trying to connect to the MQTT broker
# client is the client instance connected this time
# userdata is users' information, usually empty. If it is needed, you can set it through user_data_set function.
# flags save the dictionary of broker response flag.
# rc is the response code.
# Generally, we only need to pay attention to whether the response code is 0.
def on_connect(client, userdata, flags, rc):
if rc == 0:
print("Connected success")
else:
print("Connected fail with code {rc}")
client = mqtt.Client()
client.on_connect = on_connect
# client.on_message = on_message
client.username_pw_set("[USER]", "[PASSWORD]")
client.connect("[LOCAL IP]", 1883, 60)
client.loop_forever()
According to the Mosquitto add-on settings page, “you can use Home Assistant users too, without any configuration.” I have created a specific user (let’s call it mqtt) in Home Assistant for this purpose and restarted Home Assistant.
However, when I add the mqtt user’s login details to my Python script for the Raspberry Pi MQTT client and run the script, it fails to authorize. Mosquitto logs show:
...
2024-11-13 14:33:11: New connection from [IP] on port 1883.
2024-11-13 14:33:11: Client [clientname] disconnected, not authorised.
...
If I replace the login details with the username and password of my personal Home Assistant user and try again—having changed nothing else—then the login succeeds.
What am I missing? What is preventing me from logging into Mosquitto with one Home Assistant user, but not the other?