This requires nmap to be installed:
apt-get install net-tools nmap
#NMap device_tracker: - platform: nmap_tracker hosts: 192.168.1.0/24 consider_home: 180
home_interval (integer)(Optional)The number of minutes Nmap will not scan this device, assuming it is home, in order to preserve the device battery.
This will auto create device.whatever tracking entities in HA, but it's good to know about "known_devices.yaml" (which is being deprecated) in case you want to customize things. I had my device show up two times, once via GPS and another via "Ping" which is what I wanted, so I had to rename one easily differentiate.
I believe states are "home/away".
I setup a lovelace card w/ both devices and entity state while setting up/debugging.