Shutdown Script

Shutdown Script
Participants
Skills	Python, Linux
Status	Finished
Niche
Purpose	Saving energy and money
Tool	No
Location
Cost
Tool category

Shutdown Script

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A script that shuts PC's down on the space when space state is off.

It checks space status on MQTT and shuts machine down if space is closed.

• Make sure you have paho installed.

apt install python-pip
pip install paho-mqtt

• Log in as root and access root folder.

sudo -s
cd /root/

• Enter crontab.

crontab -e

• Add a cronjob on the last line with the location of the script file.

* * * * *  python /home/user/space_status_shutdown.py

The Script

Make sure the file has a .py extension.

#!/usr/bin/env python

#2019 The_Niz

#checks space status and shuts machine down if space is closed


import paho.mqtt.client as mqtt
import os 

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):

    if rc==0:

        client.connected_flag=True #set flag

        print("Connected with result code "+str(rc))

    else:

        print("Bad connection Returned code=",rc)

        client.loop_stop()

        client.disconnect()

    client.subscribe("space/state")

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):

    print(msg.topic+" "+str(msg.payload))

    if msg.payload=="false":

        print("Space is uit")

        os.system('sudo /bin/systemctl poweroff')

    else:

        print("Space is aan")

    client.loop_stop()

    client.disconnect()


client = mqtt.Client()

client.on_connect = on_connect

client.on_message = on_message

client.connect("arbiter.vm.nurd.space", 1883, 60)

client.loop_forever()