def oem(self, command, timeout_ms=None, info_cb=DEFAULT_MESSAGE_CALLBACK):
    """Executes an OEM command on the device.

    Args:
      command: The command to execute, such as 'poweroff' or 'bootconfig read'.
      timeout_ms: Optional timeout in milliseconds to wait for a response.
      info_cb: See Download. Messages vary based on command.
    Returns:
      The final response from the device.
    """
    return self._simple_command(
        'oem %s' % command, timeout_ms=timeout_ms, info_cb=info_cb)