The setup process for our Cocoon home security device (https://cocoon.life) uses an audio transfer from the phone to pass wifi details and a token to bootstrap setup and a trust relationship.
After some time spent tuning and with some forward error correction, the reliability is good and it's not too harsh on the ears. Response from beta testers has been pretty positive.
After some time spent tuning and with some forward error correction, the reliability is good and it's not too harsh on the ears. Response from beta testers has been pretty positive.