{
  "ok": true,
  "steps": [
    "connect({hostname,port},{secureTransport:'starttls'}) → 返回 socket",
    "socket.opened → TCP 建连成功",
    "socket.secureTransport = starttls",
    "startTls(无参) → 返回新 socket",
    "secure.opened → TLS 握手完成",
    "向 TLS socket 写入明文 → 成功（说明已是 TLS 通道）",
    "读到 0 字节："
  ]
}