class MQTTClientBase:
    def __init__(self, host, user, password, client_id):
        self.host = host
        self.user = user
        self.password = password
        self.client_id = client_id

        self._connect()

    def send_data(self, topic, data):
        raise NotImplementedError("Send not implemented")

    def _connect(self):
        raise NotImplementedError("Connect not implemented")

    def is_async(self):
        return False