Where should I initialize my MQTT Loop in Django

Question

Currently my init.py looks like this:

from . import mqtt
mqtt.client.loop_start()

But when I run it some actions in the loop are done more than once. When I place a time.sleep(30) in front everything works as intended. But I think this is not the best thing to do.

How do I run my loop only when everything else has loaded.

I tried putting it in an AppConfig ready like so:

from django.apps import AppConfig
from . import mqtt

class PrintConfig(AppConfig):
    default_auto_field = 'django.db.models.BigAutoField'
    name = 'print'

    def ready(self):
        mqtt.client.loop_start()

but I get the following error:

RuntimeError("populate() isn't reentrant")

Is there something I need to add to my INSTALLED APPS when I use the def ready(self): function ?