Zigbee devices Of that profile don’t work with two different hubs at the same time. So if it’s on your network, it’s not going to respond to your neighbor at all and you would not see any on/off requests for the device if you weren’t doing them.
You could turn it on to alert the neighbor that the device was live, but they would have no way of controlling it except to unplug it. Or turn it off with a switch if it’s on a switched circuit.
(The exception to this is a Phillips hue bridge which can be controlled in multiple ways, but that’s a whole different story.)
If this is a Zigbee light strip In your neighbors house, then if you can control it, they can’t. It’s either on your network or theirs, not both.
If you are seeing control requests in the log that you are not issuing one of two things is happening.
A) this is a real device on your network. For example, we had one of these situations when one of my housemates bought a light to work with the echo plus in his room but it got picked up by the hub instead.
B) this is a problem in the smartthings cloud, and you are seeing database entries from a device that is in fact not on your network. This has happened a couple of times in the past, although it’s rare. There was one community member who reported seeing entries for a “dining room light“ when their house didn’t even have a dining room.
If it’s B, only smartthings support can fix it.
If it’s a, it might physically be at your neighbors, may be a Christmas light string, but once you have control of it, you have control. So doing things to make your neighbor crazy aren’t likely to help unless you were just trying to get them to unplug it.
But if you are seeing control requests come through the logs, somebody on your network is doing that. Or it’s a cloud problem.