[Gremlin]

I installed a security camera which has a wi fi link to my router.
If someone knocks or rings the door bell I quickly look at the app on my phone which links to the camera.
If I don't recognise the caller I don't even bother going to the door.
A few months ago I saw either the jovos or Mormons about to push a leaflet through the letter box so I crept up to the door below the window level and held the flap shut.
I think they got the message.
The downside was that I had a struggle to get up again.