run

at first install docker then run mqtt-broker

docker run -p 8080:8080 -p 1883:1883 hivemq/hivemq4

http://localhost:8080/ #hive web

now install requirements

python3.8 -m virtualenv venv
source venv/bin/activate
pip install -U pip
pip install -r requirements.txt

now run central_server

python central_server.py

now run flask-mqtt as local server

python local_server.py