university-final-iot-backend/app/mqtt/__init__.py

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import atexit
from flask import Blueprint
from .mqtt_client import MqttClient
mqtt_bp = Blueprint('mqtt', __name__)
# Setup
@mqtt_bp.record
def __on_blueprint_setup(setup_state):
MqttClient.setup(setup_state.app)
# When app dies, stop mqtt connection
def on_stop():
MqttClient.tear_down()
atexit.register(on_stop)