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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.