"""TCP 单次发送客户端：发送 3 条测试消息，验证基本连通性"""

import socket
import time

HOST = "127.0.0.1"
PORT = 8888
MESSAGE_COUNT = 3


def send_once(index: int) -> bool:
    try:
        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        client.settimeout(5)
        client.connect((HOST, PORT))
        msg = f"test_message_{index}_{time.time()}"
        client.send(msg.encode("utf-8"))
        reply = client.recv(1024)
        client.close()
        print(f"消息 {index} 发送成功，回复: {reply.decode('utf-8', errors='replace')}")
        return True
    except Exception as exc:
        print(f"消息 {index} 失败: {exc}")
        return False


if __name__ == "__main__":
    print(f"开始连通性测试: 发送 {MESSAGE_COUNT} 条消息到 {HOST}:{PORT}")
    success = 0
    for i in range(MESSAGE_COUNT):
        if send_once(i):
            success += 1
    print(f"完成: 成功 {success}/{MESSAGE_COUNT}")