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Great job! It sounds very satisfying!
I've been using ESP32 myself for a couple of home automation project, coded both in python and C++, but only super simple stuff and never anything really complicated like this.

It has taken a while, over 1000 lines of code and a lot of late nights to get it to the point now where it works.

The last thing I need to do to get it ready to release is a scan and connect routine for any BT adaptor which is fully ELM compliant, which for some reason seems to be a bit tricky, instead of knowing the adapters MAC address beforehand. It's an issue of the BT serial library, but I'll crack that yet.

Hi STP, any further progress with this impressive piece of work?

Well, I've been using mine for a while now and all is good however I have not cracked being able to scan for random adaptors to pair with, requiring the Mac address of the adaptor to be known beforehand. I have been really busy at work after a promotion to a new job and still having to participate in my old job (!) but hope to get this final issue resolved.

I currently use an VLinker FD which is good, goes to sleep when the van is off, no issues. Swapped out to a Carista one (older white model) and it killed the battery in two days of not using the van. Carista actually say on their website not to leave it plugged in as it discharges the battery by keeping the vehicle CANBUS system alive - no kidding.

So back the the VLinker, will update when I crack the scan thing for Bluetooth adaptors. But recommended the VLinker one anyway.

Congrats on the promotion!

That sounds like progress anyway despite maybe feeling like you haven't made much. I'm sure you'll crack the outstanding niggle.