Double acoustic stopwatch and speed of sound

[Jens Noriʇzsɔɥ]

At the moment, there is no “native” solution for your problem in our BLE library. This could easily get fixed when the phyphox side is ready by supporting “offset” (it is not scheduled yet).

So, it is either manually implementing a second characteristic taking values in the .ino code or fiddling with byte array. :/