Ref: Locking setup or setting in HA
I wish to be able to LOCK the detection of new devices, no automatic detection in locked state.
Something similar to Config: LOCKED to disable auto-detection of new devices… and
Config: changes allowed to signify the expectancy of popups for e.g. detected BT-devices.
As stated elsewhere, I live in an RV and scoot around frequently; Unknown BLE devices pop up frequently as a “friend” RV appear near mine.
Doesn’t track_new_devices: false do this?
It seems to work with my Bluetooth LE tracker integration:
device_tracker:
- platform: bluetooth_le_tracker
track_new_devices: false
Set to “true” I get thousands of new devices in known_devices.yaml; set to “false” I don’t get any. This is the opposite of what the docs say, but hey, what else is new… 
Well, I’ve seen that before. And most likely forgot it quite soon after it.
IMO this belongs in the GUI, e.g. for the Bluetooth integration.
Just today I added one BLE device; would I have remembered to set “True” in the configuration.yaml file? Nahh… I probably had sworn quite many times…