async def start_authentication(self):
_, code = await self.http.post_data(<EOL>'<STR_LIT>', headers=_AIRPLAY_HEADERS)<EOL>if code != <NUM_LIT:200>:<EOL><INDENT>raise DeviceAuthenticationError('<STR_LIT>')<EOL><DEDENT>
Start the authentication process.

        This method will show the expected PIN on screen.