---
title: Checkpoint 2026-09-29 23:24:00 UTC [1c873d5e0b]
type: checkpoint
permalink: main/projects/25464650-ed5d-440e-b362-190f2852d451/checkpoint-2026-09-29-23-24-00-utc-1c873d5e0b
stable_id: c42e5f81-e06a-432b-b9be-64f7f9ec4d5c
scope: project
memory_type: checkpoint
project_id: 25464650-ed5d-440e-b362-190f2852d451
usage_profile_id: 0c9feb46-d06e-43cd-9ef0-c5813c84a998
status: active
revision: 1
request_id: m-delivery-m2m3m4-20260930-ready
created_at: '2026-09-29T23:24:00.669438+00:00'
updated_at: '2026-09-29T23:24:00.669438+00:00'
tags:
- ready-to-merge
- line-M
- M2
- M3
- M4
---

# 消息线 M2–M4 完成

- 分支：`feat/m-delivery`
- 工作树：`e:\code\NixMsg-wt\m2`
- 基于：`origin/main` `d357082`
- 提交：`9b053fd feat: 实现消息分发推送确认撤回与启动恢复`
- 验证：`task check` 通过（含 message 包表驱动测试：宽限、保留到期、确认超时两种、撤回竞态、防重、启动恢复等）
- DEVIATIONS：已写「消息 M」M2/M3/M4 节，保留其他线节
- 未接真实 MQTT：`Downlink`/`ConnRegistry` 可注入；测试用 `RecordingDownlink`+`MemoryConns`；未改 `cmd/nixmsg`/`wire.go`；调度/清理循环需接线方调用 `DispatchDue`/`PushPending`/`CleanupOnce`

## 给下个会话
- 总控按第 7 节审阅后 ff-only 合并；本分支已推送、工作区干净
- 接线：握手/断线调 `OnHandshakeComplete`/`OnDisconnect`；`OnPublishDropped` 转 `App`；启调度与清理循环