diff --git a/docs/operations/go-vehicle-gateway-verification-result-2026-07-01.md b/docs/operations/go-vehicle-gateway-verification-result-2026-07-01.md
index 7c1d58aa..1c766bb8 100644
--- a/docs/operations/go-vehicle-gateway-verification-result-2026-07-01.md
+++ b/docs/operations/go-vehicle-gateway-verification-result-2026-07-01.md
@@ -832,3 +832,57 @@ protocols=["JT808"]
 - `deploy/systemd/lingniu-go-history-writer.service`
 - `deploy/systemd/lingniu-go-stat-writer.service`
 - `deploy/systemd/lingniu-go-realtime-api.service`
+
+## 2026-07-02 00:04 宇通 MQTT EOF 诊断
+
+现象：
+
+Go 原生部署后，`lingniu-go-gateway` 日志中出现多次：
+
+```text
+mqtt connection lost error=EOF
+mqtt connection lost error=write: broken pipe
+mqtt subscribed topic=/ytforward/shln/+ qos=1
+```
+
+10 分钟窗口统计：
+
+```text
+mqtt subscribed = 33
+mqtt connection lost = 32
+```
+
+对照旧 Java `yutong-mqtt-app` 历史日志，停止前也存在同类行为：
+
+```text
+mqtt endpoint [yutong] received topic=/ytforward/shln/1 bytes=574
+mqtt endpoint [yutong] connection lost
+Caused by: java.io.EOFException
+mqtt endpoint [yutong] re-subscribed topic=/ytforward/shln/+ qos=1
+mqtt endpoint [yutong] received topic=/ytforward/shln/3 bytes=586
+```
+
+判断：
+
+- EOF/短连接不是 Go TLS 支持或 systemd 原生部署新引入的问题。
+- 旧 Java 和新 Go 都表现为：订阅、收到数据、broker 断开、自动重连。
+- 当前链路可持续收到宇通 MQTT 数据并写入 TDengine RAW。
+
+复验：
+
+```text
+GET /api/history/raw-frames?protocol=YUTONG_MQTT&limit=1
+
+total=1
+protocol=YUTONG_MQTT
+vin=LMRKH9ACXR1004094
+parse_status=OK
+parsed_json_len=1080
+fields_json_len=115
+```
+
+运维建议：
+
+- 单条 EOF 不作为不可用判断。
+- 以 `YUTONG_MQTT` RAW 入库增长、最近成功 `mqtt subscribed` 时间、服务 `systemctl is-active` 作为可用性判断。
+- 如果 EOF 频率继续升高且 RAW 不再增长，再联系宇通侧确认 broker 长连接策略、同一 clientId 并发限制或网络出口策略。