I used Oboe (and its predecessor, Howie) to make a self-balancing robot on Android. We were able to use the headphone jack (RIP) as a low-latency output to send

I used Oboe (and its predecessor, Howie) to make a self-balancing robot on Android. We were able to use the headphone jack (RIP) as a low-latency output to send serial data to an Arduino[0]. Android Studio has also finally improved NDK support enough that writing large chunks of your app in C++ isn't painful anymore. [0]: https://davidawehr.com/blog/audioserial/ https://davidawehr.com/blog/audioserial/