<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def handle_client_hello(self, client_addr, _: ClientHello):
 """ Handle an ClientHello message. Send available containers to the client """

        self._logger.info("New client connected %s", client_addr)
        self._registered_clients.add(client_addr)
        await self.send_container_update_to_client([client_addr])