How to send phyphox file from sensor ?

[Uwe]

Hi,

I'm currently doing my first steps with great Phyphox and work on programming an ESP32 to become a small universal sensor board.
There is a lot to learn on BLE :-)

On the linked page you mention that phyphox file can also be provided directly by peripheral device (instead of coping the file to smartphone or using QR codes):
Phyphox on BLE

Is there any description or code example how BLE dialog happens to initiate transfer between smartphone and device and how file transfer is handled (e.g. is data sent by server or read by client ...) ?

Thanks
Uwe