"""
心跳 MQTT 端点 — 仅上报，无需响应

通过 MQTT 主题 chongming/example/heartbeat 发送心跳，
Worker 返回 None，MQTT Bridge 不发布响应。
"""
import time

from chongming_worker import rpc_method


@rpc_method(
    subject="example.heartbeat",
    method="MQTT",
    summary="Heartbeat ping via MQTT (no response)",
)
async def heartbeat(worker_id: str = "") -> None:
    """心跳上报 — 无返回值，MQTT Bridge 跳过响应发布"""
    print(f"[Heartbeat] worker={worker_id} time={time.time()}")
    return None  # 显式返回 None，MQTT Bridge 不发布响应