I have been tinkering with Home Assistant recently 
and have found great use in their AsusWRT device tracker.
This is working perfectly for detecting the 3 iPhones in our home.
What is does is connect to the router over SSH (with password or ssh-key) and execute some scripts. I haven’t reversed engineerd this, but am wondering if someone has similar functionality working in openhab. Or if anyone is currently developing a dedicated one.
I’m currently looking into that, but unfortunately I don’t have the knowledge to port it. It’s weird that nobody cares about it, since ASUS routers are pretty common and it’s a great way of detecting presence.
Is anyone interested in it?
(sorry for the bump, but I wanted to ask that exact question)
If you have an ASUS router that supports ddwrt you gain SNMP support and then can review instructions on how I query my network equipment for detection.
From DD WRT - https://wiki.dd-wrt.com/wiki/index.php/SNMP
1.3.6.1.4.1.2021.255.3.54.1.3.32.1.4.1 Associated MAC text 00:ff:as:dd:44:55
My detection method - Leveraging SNMP to detect your mobile device
Any news?
I also wait for asus router binding