Hello, my name is Massimo and I’m writing from Naples, Italy.
A few days ago, I discovered that a device with the hostname WIFIAIRCONDITIONER-e930 and MAC address 78:E3:6D:B3:E9:30 is connected to my router (FRITZ!Box 7590 AX).

I’m quite sure it isn’t one of the devices I have at home,
but after ...