all

.gitignore

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+venv/**
+*.log

check-connection.sh

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+#!/bin/bash
+
+cd ~/mqtt-halt-pack || exit
+
+
+while [ 0 -eq 0 ]; do
+
+  if [ $(ping -q -w 10 -c 1 192.168.31.5 > /dev/null && echo 1 || echo 0) -eq 0 ]; then
+	  echo "$(date '+%Y%m%d%H%M%S'): 0"
+  else
+	  echo "$(date '+%Y%m%d%H%M%S'): 1"
+  fi
+  sleep 10
+done
+

client/client.py

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+#!/usr/bin/python3
+
+import paho.mqtt.client as mqtt
+import paho.mqtt.publish as publish
+import traceback
+import os
+import datetime
+
+monitor_state = 1
+
+def on_connect(mqttc, obj, flags, rc):
+    now = datetime.datetime.now()
+    print(str(now) + ": " +"Connected to %s:%s" % (mqttc._host, mqttc._port))
+
+def on_message(mqttc, obj, msg):
+    global monitor_state
+
+    now = datetime.datetime.now()
+    print(str(now) + ": " +msg.topic+" "+str(msg.qos)+" "+str(msg.payload))
+
+    if msg.payload.decode('UTF-8') == 'halt':
+        print('powering off')
+        try:
+            publish.single("dom/pimirror-ack", "went-halt", hostname="192.168.31.5")
+            print("ack sent")
+        except Exception as e:
+            print("Exception when sending:" + str(e))
+        except:
+            print("Exception when sending:" + traceback.format_exc())
+        
+        os.system("sudo shutdown now -h")
+
+    elif msg.payload.decode('UTF-8') == 'display_on':
+        if monitor_state == 0:
+            monitor_state = 1
+            os.system("/home/pi/display_on.sh")
+            print("display on")
+
+    elif msg.payload.decode('UTF-8') == 'display_off':
+        if monitor_state == 1:
+            monitor_state = 0
+            os.system("/home/pi/display_off.sh")
+            print("display off")
+
+def on_publish(mqttc, obj, mid):
+    now = datetime.datetime.now()
+    print(str(now) + ": " +"mid: "+str(mid))
+
+def on_subscribe(mqttc, obj, mid, granted_qos):
+    now = datetime.datetime.now()
+    print(str(now) + ": " +"Subscribed: "+str(mid)+" "+str(granted_qos))
+
+
+def on_log(mqttc, obj, level, string):
+    now = datetime.datetime.now()
+    print(str(now) + ": " +string)
+
+# If you want to use a specific client id, use
+# mqttc = mqtt.Client("client-id")
+# but note that the client id must be unique on the broker. Leaving the client
+# id parameter empty will generate a random id for you.
+
+mqttc = mqtt.Client()
+mqttc.on_message = on_message
+mqttc.on_connect = on_connect
+mqttc.on_publish = on_publish
+mqttc.on_subscribe = on_subscribe
+
+# Uncomment to enable debug messages
+mqttc.on_log = on_log
+mqttc.connect("192.168.31.5")
+mqttc.subscribe("dom/pimirror", 0)
+
+mqttc.loop_forever()

install-on-pi.sh

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+#!/usr/bin/env bash
+
+cd ~/mqtt-halt-pack || exit
+
+python3 -m venv venv
+
+source venv/bin/activate
+
+pip install --upgrade pip
+
+pip install -r requirements.txt --no-cache-dir --disable-pip-version-check --index-url https://www.piwheels.org/simple
+

requirements.txt

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+# pydbus
+paho-mqtt
+# Pycairo
+# PyGObject

restart-rop.sh

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+#!/bin/bash
+
+echo
+echo "$(date '+%Y%m%d%H%M%S'): restarting run-on-pi" >> /home/pi/mqtt-halt-pack/app.log
+
+killall run-on-pi.sh
+
+nohup /home/pi/mqtt-halt-pack/run-on-pi.sh >> /home/pi/mqtt-halt-pack/app.log 2>&1 &
+

run-on-pi.sh

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+#!/bin/bash
+
+cd ~/mqtt-halt-pack || exit
+
+# wait until network is ready
+counter=0
+max_counter=120
+max_restart_counter=20
+
+echo "$(date  '+%Y%m%d%H%M%S'): checking connectivity"
+
+while [ $(ping -q -w 3 -c 1 192.168.31.5 > /dev/null && echo 1 || echo 0) -eq 0 ]; do
+  if [ $counter -eq $max_counter ]; then
+	  echo "$(date  '+%Y%m%d%H%M%S') give up..."
+    exit 1
+  fi
+  let counter++
+  sleep 1
+done
+
+echo "$(date  '+%Y%m%d%H%M%S'): starting client app"
+
+source venv/bin/activate
+
+restart_counter=0
+
+while [ 1 -eq 1 ]; do
+	python client/client.py
+
+	if [ $restart_counter -eq $max_restart_counter ]; then
+		echo "$(date  '+%Y%m%d%H%M%S') give up restarts..."
+		exit 1
+	fi
+	let restart_counter++
+
+	echo "$(date  '+%Y%m%d%H%M%S'): restarting client app in 5 seconds..."
+	sleep 5
+done