import socket
import struct

def receive_broadcast(port=9999, timeout=10):
    """
    接收UDP广播数据
    
    Args:
        port: 监听的端口号
        timeout: 超时时间（秒）
    """
    # 创建UDP socket
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    
    # 允许接收广播
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    
    # 绑定到所有网络接口
    sock.bind(('', port))
    sock.settimeout(timeout)
    
    print(f"正在监听广播端口 {port}...")
    
    try:
        while True:
            try:
                # 接收数据（最大缓冲区大小）
                data, addr = sock.recvfrom(1024)
                print(f"收到来自 {addr} 的广播消息:")
                print(f"  数据: {data.decode('utf-8', errors='ignore')}")
                # print(f"  原始数据: {data.hex()}")
                
            except socket.timeout:
                print("等待广播超时")
                break
            except KeyboardInterrupt:
                print("\n用户中断")
                break
                
    finally:
        sock.close()
        print("Socket已关闭")

# 运行示例
if __name__ == "__main__":
    receive_broadcast(port=37000, timeout=30)