Bluetooth board for adding switches?

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  • ESP32-BLE-Keyboard

    Bluetooth LE Keyboard library for the ESP32 (Arduino IDE compatible)

    You could also use an ESP32 board, they're pretty easy to program to act as a bluetooth/BLE keyboard (or if it suits your application, you could have it act as a joystick or a mouse or some other kind of HID or serial or even network device),

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