Chirp is the easiest way to send data using sound waves.
Chirp is designed for simplicity, eliminating connectivity headaches and simplifying everyday tasks like connecting to Wi-Fi networks, sharing contact details, and making peer-to-peer payments. It's trusted by companies and developers across the world, from nuclear power stations to children's toys.
Chirp is technology packaged as a suite of developer-friendly SDKs which can allow devices with a loudspeaker or microphone to exchange data.
Get started here : developers.chirp.io