You should be able to figure out if the signal is coming from inside vs. outside based on signal attenuation. Systems are being developed to pinpoint user locat

You should be able to figure out if the signal is coming from inside vs. outside based on signal attenuation. Systems are being developed to pinpoint user location indoors based on this technique. Fortunately, your use case is more binary: Is the bluetooth signal passing through a door. Any dBm above a certain number would just be assumed indoors. Great stuff and good luck!