A few years ago, I saw a cheap GSM adapter for a PC for e.g. emergency messages of the server. It was cheap, as it only supported 3G. Luckily, I checked availability of 3G before I bought it, as it would have been a doorstopper here.
The problem is, whatever you say against any person that by accident is also jewish, you will be called "antisemite" for it. It is a natural defense reflex. Even if you have clear video evidence of the person e.g. raping and killing babies, you will be the evil antisemite.
There is an easily hackable and cheap device from IKEA by the name of "VINDRIKTNING". There are YT videos on how to wifi-enable that thing and integrate it into home automation services.
No need for an extra router. I just put those device into the "has no internet access" group. It is one of those "Parental Control" things. Every device inside the net can see and talk to it, but itself cannot talk to anything outside.
This is not just about the amount of data. I'm well aware that the measured amounts were totally off. Nonetheless, it is about being allowed to send any kind of data to the outside at all. And while it is probably quite convenient that you can get a message when a device has done a job, it is sufficient that you as the owner gets it, not anyone outside.
Luckily, most embedded devices lack the smart to attach to two networks at the same time. So you keep it locked into a network where it can only do your bidding, and it won't listen to anyone else. Unless they built in some very crazy and nefarious code and drive around with network enabled cars in the owners neighborhood.
Just put the device on a separate wifi without internet access, or look at the "child protection" features of your router. Ours can put devices based on their MAC into "access groups" which range from "full access" over "internet from time to time" to "no internet at all".
So, Qatar is at the top of the list - for what? Doe they count exported oil, or do they actually burn loads of their own oil locally for whatever reasons? Or is this due to refining stuff and gas flares?
A few years ago, I saw a cheap GSM adapter for a PC for e.g. emergency messages of the server. It was cheap, as it only supported 3G. Luckily, I checked availability of 3G before I bought it, as it would have been a doorstopper here.