"""
MQTT client for messaging and automation.

Provides pub/sub integration for IoT and automation systems.
Requires: pip install cnckit[mqtt]
"""


class MQTTClient:
    """
    MQTT client for cnckit events and commands.

    Publishes machine state and job events to MQTT topics.
    Subscribes to command topics for remote control.

    Raises:
        ImportError: If paho-mqtt is not installed
    """

    def __init__(self, broker: str, port: int = 1883):
        """
        Initialize MQTT client.

        Args:
            broker: MQTT broker hostname
            port: MQTT broker port
        """
        try:
            import paho.mqtt.client  # noqa: F401
        except ImportError:
            raise ImportError(
                "paho-mqtt is required for MQTT integration. "
                "Install with: pip install cnckit[mqtt]"
            )

        raise NotImplementedError("MQTT integration will be implemented in Phase 2")
