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It's also possible via something way cheaper, like an ESP32 (~US$1.5), e.g. using https://github.com/ckcr4lyf/EvilAppleJuice-ESP32 (Disclaimer: I am the author)

Makes sense because the flipper zero basically is an esp32 with a display and a few other radios.

I wonder if it could also be done with a simple android app.