I also work in automotive, all of the messages related to starting the car (which is required for climate control) or unlocking the vehicle will be encrypted with keys you will not be able to extract. Many have MAC authentication and counters for invalid attempts. Too many wrong hits and you’ll trigger a DTC which may need a visit to the mechanic to clear. Furthermore, a lot of the behaviours you want to trigger that are done via the app normally use a telematics unit in the car that will authenticate with the OEM server. You will not be able to get this authentication. Sorry to be the bearer of bad news, but what you’re trying to do is exactly what car thieves wish they could do, which is why we put in every effort to make it extremely hard.
I haven’t played it yet but apparently this 'Clair Obscur: Expedition 33" is fantastic. I’ll quote a friend who just finished it: “Just finished Clair Obscur. Probably not 100%, but I’ve beaten the superboss and completed the story. It has the exact same feeling as finishing a really good book that makes you feel bad in all the good ways, the kind that has you stare off into the distance after putting it down for the last time.”
Personally I feel like I haven’t played a great story driven game in a long time. Maybe Baldur’s gate 3 could appeal to you. Still not sure it sucked me in as much as Horizon did though.
On a deep sale, the Jedi Fallen order and Survivor are good story games.