add mqtt_monitor_systemlock.sh

1 files changed, 42 insertions, 0 deletions

diff --git a/scripts/mqtt_monitor_systemlock.sh b/scripts/mqtt_monitor_systemlock.sh
new file mode 100755
index 0000000..92ce987
--- /dev/null
+++ b/scripts/mqtt_monitor_systemlock.sh
@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# Automatically lock/unlock system with bluetooth based presence detection
+# using monitor on raspi and mosquitto MQTT client
+#
+# ./mqtt_monitor_systemlock.sh [BROKER] [TOPIC]
+
+
+readonly THRESHHOLD=50
+LAST_CONFIDENCE=100
+
+readonly DEPENDS=( mosquitto_sub jq xset xsecurelock )
+for prog in "${DEPENDS[@]}"; do 
+	if ! which $prog > /dev/null 2>&1; then
+		echo $prog not found
+		exit 1
+	fi
+done
+
+while read msg; do
+	if ! CONFIDENCE=$(jq -r ".confidence" <<< "$msg"; exit $?); then
+		echo JQ parse error.
+		exit 1
+	fi
+
+	if [ $CONFIDENCE -lt $THRESHHOLD -a $LAST_CONFIDENCE -ge $THRESHHOLD ]; then
+		echo [$(date +%d.%m.%Y\ %H:%M)] OFF
+
+		XSECURELOCK_PASSWORD_PROMPT=kaomoji xsecurelock 2> /dev/null &
+		LOCK_PID=$!
+
+		xset dpms force standby
+	elif [ $CONFIDENCE -gt $THRESHHOLD -a $LAST_CONFIDENCE -le $THRESHHOLD ]; then
+		echo [$(date +%d.%m.%Y\ %H:%M)] ON
+
+		kill $LOCK_PID
+
+		xset dpms force on
+	fi
+
+	LAST_CONFIDENCE=$CONFIDENCE
+done < <( mosquitto_sub -h "$1" -t "$2" )