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#!/bin/bash

########################################
# MQTT presence detection using G-Tags #
#                          version 0.2 #
#              copyright by eiGelbGeek #
########################################

#configuration
mqtt_broker_ip="192.168.10.15"
mqtt_broker_port="1883"
mqtt_username="USERNAME"
mqtt_password="PASSWORD"
mqtt_topic="/geeknet/presence/"
openhab_items=("GTag_1" "GTag_2" "GTag_3")
gtag_ids=("78:8F:88:99:89:6D" "78:8F:80:99:8D:88" "78:28:88:99:C8:38")

#From here changes can lead to loss of function!
filename=/tmp/bluetooth_devices.$$
hcitool lescan > $filename & sleep 10
pkill --signal SIGINT hcitool
sleep 1

for ((i=0;i<${#gtag_ids[@]};++i)); do
  searchresult=$(grep -c ${gtag_ids[i]} $filename)
  if [ $searchresult -gt 0 ]; then
      mosquitto_pub -h $mqtt_broker_ip -p $mqtt_broker_port -u $mqtt_username -P $mqtt_password -t $mqtt_topic${openhab_items[i]}/status -m ON
  else
      mosquitto_pub -h $mqtt_broker_ip -p $mqtt_broker_port -u $mqtt_username -P $mqtt_password -t $mqtt_topic${openhab_items[i]}/status -m OFF
  fi
done
rm $filename

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//Gruppen
Group:Switch:AND(OFF,ON) gPresence

//Items
Switch Presence "Jemand Anwesend?"
Switch Presence_Timer "Timer für Präsenzerkennung" { expire="10m,command=OFF" }
Switch GTag_1 "GTag_1" (gPresence) { channel="mqtt:topic:presence:GTag_1" }

//RULES
rule "Presence update"
when
  Item gPresence received update
then
  if(gPresence.state == ON && Presence.state != ON){
    Presence.sendCommand(ON)
  }
  else if(gPresence.state == OFF && Presence.state != OFF && Presence_Timer.state != ON){
    Presence_Timer.sendCommand(ON)
  }
end

rule "Presence Off"
when
  Item Presence_Timer received command OFF
then
  Presence.sendCommand(OFF)
end

rule "Presence"
when
  Item Presence changed
then
  if (Presence.state == ON){
    sendTelegram("gBot", "Jemand ist zu Hause\n" + (now.toString("HH:mm")) +" Uhr")
  }
  else {
    if(Presence.state == OFF){
      sendTelegram("gBot", "Niemand zu Hause\n" + (now.toString("HH:mm")) +" Uhr")
    }
  }
end

rule "Presence GTag 1"
when
  Item GTag_1 changed
then
  if (GTag_1.state == ON){
    if (Presence_Timer.state == ON) Presence_Timer.postUpdate(OFF)
  }
end

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2E:7E:F9:5E:3C:78 (unknown)
37:27:66:49:F2:D8 (unknown)
4B:4D:FD:99:7D:4C (unknown)
4B:4D:FD:99:7D:4C (unknown)
4C:A1:C1:32:80:4A (unknown)
4C:A1:C1:32:80:4A (unknown)
6E:D7:75:8B:3B:BE (unknown)
6E:D7:75:8B:3B:BE (unknown)
7C:2F:80:C3:9F:18 (unknown)
7C:2F:80:C3:9F:18 Gigaset G-tag
C8:B2:1E:A6:1F:6B (unknown)
C8:B2:1E:A6:1F:6B BF700
F4:F9:51:BE:47:74 (unknown)
F4:F9:51:BE:47:74 (unknown)
FF:F2:9E:2B:B5:5F (unknown)
FF:F2:9E:2B:B5:5F V10