bleak>=0.22        # Bluetooth LE (macOS, Windows, Linux)
pyserial>=3.5      # USB serial boards
cryptography>=41   # encryption in the app (AES, CMAC)
sounddevice>=0.4   # microphone and speaker for the Talk app (Linux: apt install libportaudio2)
# and the system Opus library: macOS `brew install opus`, Ubuntu `apt install libopus0`,
# Windows: opus.dll on PATH
