<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def start_blocking(self):
 """ Start the advertiser in the background, but wait until it is ready """


        self._cav_started.clear()
        self.start()
        self._cav_started.wait()