<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _set_all_zone_stereo(self, zst_on):
 """ Set All Zone Stereo option on the device. Calls command to activate/deactivate the mode Return "True" when successfully sent. """

        command_url = self._urls.command_set_all_zone_stereo
        if zst_on:
            command_url += "ZST ON"
        else:
            command_url += "ZST OFF"

        try:
            return self.send_get_command(command_url)
        except requests.exceptions.RequestException:
            _LOGGER.error(
                "Connection error: unable to set All Zone Stereo to %s",
                zst_on)
            return False