connect method

Implementation

ffi.Pointer<dc_iostream_t> connect(
    ComputerTransport transport, ffi.Pointer<dc_descriptor_t> computer) {
  switch (transport) {
    case ComputerTransport.serial:
      return _connectSerial(computer);
    case ComputerTransport.usb:
      return _connectUsb(computer);
    case ComputerTransport.usbhid:
      return _connectUsbHid(computer);
    default:
      throw UnimplementedError();
  }
}