import msgspec


class MQTTWriter(msgspec.Struct):
    """MQTT writer.

    This class is responsible for writing dataframes to MQTT broker.

    Examples:
        ```python
        writer = MQTTWriter(broker="localhost", port=1883, topic="data")
        writer.write(df)
        ```
    """

    broker: str
    port: int = 1883
    topic: str
    username: str | None = None
    password: str | None = None

    def __post_init__(self):
        pass

    def write(self, data):
        """Write data to MQTT broker."""
        # Implementation would go here
        pass
