WebSerial

[slondr]

https://developer.mozilla.org/en-US/docs/Web/API/Web_Serial_API

Right now this page claims that only Chrome, Edge & Opera support it.

[elmot]

caniuse reports that WebSerial is not supported on android.
Actually it is supported up to a certain level.
What works for me:

Samsung S21FE, Android 14, Chrome 126, USB CDC devices (ESP32-S3, ESP32-C3, RPi Pico with Micropython firmware)

What does not work:

• Firefox for Android did not work at all
• Any wide-spread adapters like FTDI, SiliconLabs CP2102, CH340 are not supported