How to detect if there someone is home or if the house is empty.
Prerequisite
- OpenWRT router
- MQTT server
- Something to interpret and display data (Node-RED, Home Assistant, Domoticz, OpenHAB, etc.)
On your OpenWRT router:
Install mosquitto-client. If you don't use encrypted communication use -nossl version.
opkg install mosquitto-client-ssl
Download presence_sensor script:
wget -O /usr/bin/presence_report https://github.com/dersimn/owrtwifi2mqtt/raw/master/presence_report
make it executable:
chmod u+x /usr/bin/presence_report
Now you can check if it works. Run command:
root@OpenWrt:~# /usr/bin/presence_report event 192.168.1.8 presence_report, mode: event, MQTT server: 192.168.1.8
Change 192.168.1.8 to address of your MQTT server. Turn WiFi on one of your devices (my was e6:6a:ca:c8:38:e6).
root@OpenWrt:~# /usr/bin/presence_report event 192.168.1.8 presence_report, mode: event, MQTT server: 192.168.1.8 Mac: e6:6a:ca:c8:38:e6 did del Mac: e6:6a:ca:c8:38:e6 did new
as you can see there my device "left" (del) and connect (new) to Wi-Fi.
Press Ctrl-C to stop test.
To start this every time router boots I've added this line:
(/usr/bin/presence_report event 192.168.1.8 >/dev/null 2>&1 )&
to /etc/rc.local file. Of course before "exit 0".
Using data
You can subscribe to "owrtwifi/status/#" topics to receive messages in topic like this:
owrtwifi/status/mac-e6-6a-ca-c8-38-e6/event
and payload del or new.
They are also messages in topic
owrtwifi/status/mac-e6-6a-ca-c8-38-e6/dhcp-name
and name of your device in payload.
I'm using Node-RED and check every device like this:
context.devicescount=0;
if (!context.hasOwnProperty("devices")) {
context.devices={};
}
if (msg.topic === "owrtwifi/status/mac-e6-6a-ca-c8-38-e6/event") {
if (msg.payload === "new") {
context.devices.PhoneNo1 = 1;
}
if (msg.payload === "del") {
context.devices.PhoneNo1 = 0;
}
}
// repeat above to all of your mobile devices
if (msg.topic === "owrtwifi/status/mac-00-11-22-33-44-55/event") {
if (msg.payload === "new") {
context.devices.PhoneNo2 = 1;
}
if (msg.payload === "del") {
context.devices.PhoneNo2 = 0;
}
}
let values = Object.values(context.devices);
values.forEach(function (value,index) {
if (value == 1) {
context.devicescount+=1;
}
return null;
});
if (context.devicescount>0) {
node.send({payload:{"devices":context.devicescount},topic:"mydevices"});
}
else {
node.send({payload:{"devices":context.devicescount,"house is empty":1},topic:"mydevices"});
}
Maybe it's not the best way, but it works for me.
The most important value is devicescount - the house is empty if equal to zero.
Of course this method cannot distinguish if you are in home or you just forgot your phone. It's obvious, but I want to be sure you know this too ;-)
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