So how do newer cars send this info back? Do they have their own transmitters? Or are they uploading data via my wifi while parked in my garage? If so, can I just block the vehicle’s MAC on my network?
If you have a car that uses cellular for in-car wifi or any other services (such as Onstar or competing services) that’s the way. And it’s possible (though I have no idea if it’s done) that they could include a cellular connection that isn’t available to you as the customer, but is used only for this purpose.
So how do newer cars send this info back? Do they have their own transmitters? Or are they uploading data via my wifi while parked in my garage? If so, can I just block the vehicle’s MAC on my network?
They have their own transmitters over cellular network.
If you have a car that uses cellular for in-car wifi or any other services (such as Onstar or competing services) that’s the way. And it’s possible (though I have no idea if it’s done) that they could include a cellular connection that isn’t available to you as the customer, but is used only for this purpose.