Python MQTT Scripte

Beschreibung:

Python Scripte für MQTT

Scripte:

proc2mqtt_linux - Ein Script was prüft, läuft ein Process oder nicht:

Verzeichnis Struktur, achtet auf euren Usernamen

/home/stefan/proc2mqtt/
├── proc2mqtt.py
├── .env
├── start.sh
└── proc2mqtt.service

Das Script:

#!/usr/bin/env python3

import time
import psutil
import paho.mqtt.client as mqtt
import argparse

# 🧾 Argumente einlesen
parser = argparse.ArgumentParser(description="Monitor a process and publish MQTT on start/stop.")
parser.add_argument("--broker", required=True, help="MQTT broker IP or hostname")
parser.add_argument("--port", type=int, default=1883, help="MQTT broker port (default: 1883)")
parser.add_argument("--topic", required=True, help="MQTT topic to publish to")
parser.add_argument("--process", required=True, help="Process name to monitor (e.g. cura)")
parser.add_argument("--interval", type=int, default=5, help="Check interval in seconds (default: 5)")
parser.add_argument("--onmsg", default="started", help="Message when process starts")
parser.add_argument("--offmsg", default="closed", help="Message when process stops")
parser.add_argument("--username", help="MQTT username (optional)")
parser.add_argument("--password", help="MQTT password (optional)")
args = parser.parse_args()

# 🔐 MQTT Client konfigurieren
client = mqtt.Client()
if args.username and args.password:
    client.username_pw_set(args.username, args.password)

client.connect(args.broker, args.port)
client.loop_start()

was_running = None

def is_proc_running(name):
    for proc in psutil.process_iter(['name']):
        try:
            if name.lower() in proc.info['name'].lower():
                return True
        except (psutil.NoSuchProcess, psutil.AccessDenied):
            continue
    return False

# 🔁 Hauptloop
while True:
    running = is_proc_running(args.process)
    if running != was_running:
        msg = args.onmsg if running else args.offmsg
        print(f"[MQTT] {args.process} is now {msg}")
        client.publish(args.topic, msg, qos=1, retain=True)
        time.sleep(0.5)  # optional
        was_running = running
    time.sleep(args.interval)

Aufruf, wenn man kein Systemd benutzen will

python3 proc2mqtt.py   --broker 192.168.177.20 \
--port 1883 \
--username mqtt_user \
--password mqtt_password \
--topic proc/gnome-calculator \ 
--process gnome-calculator \ 
--onmsg started \
--offmsg closed

nun die .env Datei

MQTT_BROKER=192.168.177.20
MQTT_PORT=1883
MQTT_USERNAME=mqtt_username
MQTT_PASSWORD=mqtt_password
MQTT_TOPIC=proc/gnome-calculator
PROCESS_NAME=gnome-calculator
ONMSG=started
OFFMSG=closed
INTERVAL=5

Die start.sh

#!/bin/bash
set -a
source "$(dirname "$0")/.env"
set +a

exec python3 "$(dirname "$0")/proc2mqtt.py" \
    --broker "$MQTT_BROKER" \
    --port "$MQTT_PORT" \
    --username "$MQTT_USERNAME" \
    --password "$MQTT_PASSWORD" \
    --topic "$MQTT_TOPIC" \
    --process "$PROCESS_NAME" \
    --onmsg "$ONMSG" \
    --offmsg "$OFFMSG" \
    --interval "$INTERVAL"

Rechte anpassen ausführbar machen die start.sh

chmod +x /home/stefan/proc2mqtt/start.sh
chmod 600 /home/stefan/proc2mqtt/.env

Nun die system.d Datei

sudo nano /etc/systemd/system/proc2mqtt.service

Inhalt, Achte auf den Username das ist der vom Benutzer hier im Beispiel stefan

# /etc/systemd/system/proc2mqtt.service
[Unit]
Description=MQTT Process Monitor
After=network.target

[Service]
ExecStart=/home/stefan/proc2mqtt/start.sh
WorkingDirectory=/home/stefan/proc2mqtt
Restart=always
User=stefan
EnvironmentFile=/home/stefan/proc2mqtt/.env

[Install]
WantedBy=multi-user.target

Nun den Dienst aktivieren

sudo systemctl daemon-reexec
sudo systemctl daemon-reload
sudo systemctl enable --now proc2mqtt.service

Und in der Home Assistant MQTT Integration