[1] https://www.amazon.com/s/ref=nb_sb_ss_c_1_9?url=search-alias...
Main reason I haven't released it yet is that the connection management, while quite resilient, is so hackish that I am bit embarrassed by it.
The only time I've really used that data was the time some jerk stopped me, cursing at me for driving like a maniac and endangering his children (who he'd been allowing to play in the street). With the logged data, I was able to show that from the time I turned onto his street, I had been going no faster than 10mph below the limit.
The OBD-II error-reading software is very useful. It showed me that the Hyundai mechanics were completely incompetent. After holding my car in the shop for a week, they finally concluded that the problem is exactly what these diagnostics told me they were (plus 10 minutes of googling).
[1] https://play.google.com/store/apps/details?id=org.prowl.torq...