We’ve got some really cheap wifi cameras from Amazon. They are supposed to be indoor cameras (we got them to watch the cats if we were away) but as they have an infrared setting, they are proving very good for watching hogs.
The problem is distance of course. Luckily we have our hog house near the house.
We bought a trail cam through Amazon, but after a couple of weeks we had to return it as it developed a fault. And the app was awful.
Since then, we’ve bought a Bushnell trail cam (came from the US so had to wait for it). Trouble is we’ve not used it much, because the cheap wifi cameras are going such a good job. But I guess that will change after the weather turns bad.