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| Line 23: |
Line 23: |
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| <code>*/5 * * * * ~/space_status_shutdown.py</code> | | <code>*/5 * * * * ~/space_status_shutdown.py</code> |
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| The script:
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|
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| <code>
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| #!/usr/bin/env python
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| #2019 The_Niz
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| #checks space status and shuts machine down if space is closed
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|
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| import paho.mqtt.client as mqtt
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| import os
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|
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| # The callback for when the client receives a CONNACK response from the server.
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| def on_connect(client, userdata, flags, rc):
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| if rc==0:
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| client.connected_flag=True #set flag
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| print("Connected with result code "+str(rc))
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| else:
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| print("Bad connection Returned code=",rc)
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| client.subscribe("space/state")
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|
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| # The callback for when a PUBLISH message is received from the server.
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| def on_message(client, userdata, msg):
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| print(msg.topic+" "+str(msg.payload))
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| if msg.payload=="False":
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| print("Space is uit")
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| os.system('sudo /bin/systemctl poweroff')
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| else:
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| print("Space is aan")
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| client.loop_stop()
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| client.disconnect()
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|
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| client = mqtt.Client()
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| client.on_connect = on_connect
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| client.on_message = on_message
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|
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| client.connect("arbiter.vm.nurd.space", 1883, 60)
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| client.loop_forever()
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| </code>
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| HarkTV
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| Owner
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Space
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| Status
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Working
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| Hostname
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harktv.dhcp.nurd.space
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| Location
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Zaal 2
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| Tool
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No
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| Tool category
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|
HarkTV
IMG 20190105 215626.jpg
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Zaal 2
What
Workstation in Zaal 2. It has a barcode scanner which can be used for Partkeepr.
Auto shutdown
We want this machine to shutdown when space is closed. We check MQTT for this in a simple python script. We use paho, so let's install that:
apt-get install python-paho-mqtt
Normally the script would ask for a password to execute the shutdown command. We can avoid this with following line in /etc/sudoers (use visudo for this):
hark harktv =NOPASSWD: /bin/systemctl poweroff
Now we just run a cronjob every 5 minutes:
*/5 * * * * ~/space_status_shutdown.py
