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RIOT-OS has pretty good support for all of those btw

Thank you for posting the link. I've seen this, but lost the link.

Would you mind explaining what the advantage is over the ESP-IDF or the Arduino-SDK?

You are using a vendor agnostic API, so your code will also work on a e.g. a STM32 or nRF52.

e.g. the Bluetooth examples will run without modification on an nRF52 or ESP32 board.