How to run a simple python script in a sandbox

Hi,

I have this python script, I want to start in a sandbox, at the same time Home-Assistant starts.

The program is very simple, and should just run in the background, when Home-Assistants run, and stop when Home-Assistant stops.

The program prepares som files, which later is read by Home-Assistant, in order to update some sensors.

I tried to make it run in script mode, but I can simply not figure out how to start it on Home-Assistant start.

This is the program, and it is absolutely disconnected from Home-Assistant, and it works perfectly, if I start it outside home-assistant, but that is not very smart.

import paho.mqtt.client as mqtt
import json
# Init a new asyncio event loop

# Create MQTT client
mqttClient = mqtt.Client()

# MQTT Event - on connect
def on_connect(client, userdata, flags, rc):
    print("Connected")
    client.subscribe("Tgrow_HIGrow/#")

# MQTT Event - on incomming message
def on_message(client, userdata, msg):
    print(3)
    global _future
    payload = (msg.payload.decode("utf-8", "ignore"))
    print(payload)
    mqtt_data = json.loads(payload)
    print("per")
    MACid = mqtt_data["Tgrow_HIGrow"]["Tgrow_HIGrow"]
    print("MACid",  MACid)
    filename = "Tgrow_Higrow" + MACid + ".json"
    
    
    file = open('custom_components/TIGO-HIGrow/Tgrow_Higrow.conf', 'r')
    found = False
    for x in file:
        if x.strip() == filename:
            print (x)
            found = True
    print(found)
    file.close()   

    
    with open('custom_components/TIGO-HIGrow/Tgrow_Higrow.conf', 'a') as conffile:
        if found == False:
            conffile.write(filename+ "\n")
    with open(filename, 'w') as outfile:
            outfile.write(payload)
    
    
  
print(1)
mqttClient.on_connect = on_connect
mqttClient.on_message = on_message
print(2)

print("start")
# Start the broker and loop^forever in the main thread
mqttClient.connect("192.168.1.64")
mqttClient.loop_forever()

Maybe it would qork having an automation that starts the script when HA starts or move the app to AppDaemon.

As this script is a minor script for a larger custom_components, I actually just want to start it via the configuration.yaml.

Is that not possible.

Right now for testing purposes I run it manually, but it would be nice just to start it via the configuration.yaml.

All examples I have seen includes communication with sensors, I just want to start the script, and forget it.