def choose_clients(self, obj):
return self.clients<EOL>
Given a message, decides which clients will receive it.

        Override to have custom routing. Default: send to all clients

        :param obj: The object to be forwarded
        :type obj: smsframework.data.IncomingMessage|smsframework.data.MessageStatus
        :return: List of client URLs to forward the message to
        :rtype: list[str]