Can the existing small module accept a harmless message over UART, with the right voltage, wiring and framing?
串口层：先理解电平、接线、波特率与数据分帧，而非马上接整个云平台。
HSIMC GLOBAL R&D · PRODUCT 004 · DTU
The phone without a screen.
You can, too.
A tiny, mature industrial communication board + one curious person + GPT + observable evidence can become the beginning of a personal production capability.
一块成熟的 4G DTU、一个普通人的真实意图，再加上 GPT 和可核对的实验记录，就可能成为属于你的生产力设施的起点。我们不重新发明 DTU；我们希望与你一起发现它能带来什么新的 Reality。
01 · MOTIVATION / 当时的启蒙
We weren't trying to replace a mature telecom product.
DTUs already solve hard problems: modem integration, SIM communication, serial-to-network transport and constrained machine-to-machine connectivity. We wanted to connect that proven component to human intent and make its capability understandable, addressable and verifiable by the people who need it.
当年关注的是一块邮票大小、没有屏幕和电池的通信板。研究记录提及约人民币 25 元、含 30 MB 流量的参考例子；带金属外壳的 DTU 约 150 元。**这是 2026 年历史观察，不是现价、报价或保证。** 一件已经成熟的工业零件，为何不能成为普通工程师、学生构建 AI Physical 的第一块积木？
Human Intent→DTU + Serial / Sensor→Network Transport→Cloud Receipt→Work + Evidence
DTU is a connectivity component. It is not itself an LLM, a standalone MCP Server, a verified sensor, or authority to control equipment.
02 · ORIGINAL RESEARCH HISTORY / 研发历史
From a tiny board to a received message.
Recovered from dated Mac source files, Azure deployment artifacts, historical design notes and an original server JSONL event ledger. Each milestone is labeled by what the evidence really proves.
- SOFTWARE ARTIFACT
Start at the receiving side
A cloud-side TCP server, echo experiments, a simple viewer and a public /dtu/ static entry survive as dated May 29 files. These show a software preparation phase—not physical cellular acceptance.
云端 TCP、Echo、Viewer 与静态入口开始出现。先解决“数据传到哪里”，但此时不能称 DTU 实物链路已经通过。
- LOCAL SOURCE FILES
Understand serial communication
The Mac preserved Python serial read, ping and send/read probes. Source files alone do not establish whether a serial device successfully replied.
Mac 保存了串口读取、Ping 与收发测试程序。先通过 GPT 理解串口通信和调试方法；程序存在不等于设备回执。
- HARDWARE IDEA
A phone without a screen
The historical design note describes a postage-stamp-size DTU PCB, an indicative ~¥25 board/30 MB data example and a ~¥150 metal-enclosure comparison. These are 2026 context observations, not current prices or a general offer.
启蒙来自小到可以嵌入普通物体的 4G DTU：没有屏幕、没有电池，也不需要重造手机系统。约 ¥25／30 MB 与约 ¥150 只是当时研究记录。
- CLOUD RECEIPT
POST + BODY reached the cloud log
The preserved server ledger contains HTTP POST test bodies, including a harmless 'yes' sample. This illustrates that method and payload format matter.
当时通过配置 HTTP POST 和 BODY，云端实际记录了测试内容。此前的难点不只是“连不连得上”，还包括请求方法与正文是否正确传送。
- CLOUD RECEIPT
An automatic polling pattern emerged
The preserved server ledger includes 21 GET /down events with AUTO_POLL, across June 5–6, including a historical Cloud_Auto_Test reply. This proves recorded requests, not yet independently the full modem-to-device actuation chain.
旧账本留有 21 条自动轮询事件及云端回复的历史记录。它证明服务器收到特定请求；仍不能单凭 HTTP 日志就断言物理设备动作成功。
- LOCAL SOURCE FILES
Serial AT and event probes
Additional Mac files for AT commands, serial monitoring and JSON event tests were saved. They help preserve the debugging method, while full terminal transcripts remain unavailable.
Mac 留下 AT、串口监测与 JSON 事件工具。这些是重新验证原始过程的重要线索，但仍须寻找原始终端运行输出。
- NEXT CASE PROPOSED
One-way EEG uplink
A candidate data route was specified: TGAT TX → DTU RX → cellular/cloud → analysis and intent. This was a bounded design proposal, not proof of a successfully uploaded EEG dataset.
提出下一实例：TGAT EEG 只发送到 DTU，再上传云端；这是一条尚待现场验证的传感数据能力路线。
03 · REAL LEARNING / 关键踩坑
Four layers, four different acceptance tests.
Is the transport running through the intended mobile network, or only local Ethernet/USB and test clients? A cloud log is not a SIM attestation.
网络层：要区分 4G、USB 和局域网；云端 HTTP 成功不等于蜂窝身份已独立证实。
A properly configured POST with a real body was essential. The server's saved test payloads became concrete evidence.
协议层：GET/POST、BODY 与返回值必须分别正确，而不是猜测数据已送达。
GET /down and a cloud response prove a server interaction; the device must separately acknowledge and demonstrate any accepted effect.
执行层：云端下发与真实动作之间，还需要设备反馈、人类授权和安全条件。
The POST/BODY formatting issue is documented in the June 5 historical discussion and matched by archived cloud event bodies. Other failure modes listed here are integration risks, not invented historical crashes or tests we did not see.
04 · VERIFIED HISTORICAL EVIDENCE / 可核对成果
“Yes” arrived. “AUTO_POLL” was logged.
And we know what that does not prove.
PRESERVED SERVER EVIDENCE · 2026-06-05–06
Cloud ingress and automatic polling events
The original JSONL contains 42 parseable HTTP records, including six POST requests and 21 GET /down polls marked AUTO_POLL. Two historical POST requests carry short test bodies. A harmless sample 'yes' and a cloud test reply are preserved.
我们能够证实云端保存过 POST 正文，以及特定自动轮询的请求和回复。原始账本已做 SHA256，公开仅提供去敏证据摘要。
NOT YET independently VERIFIED
Physical modem and continuous operation
- Which individual DTU/SIM sent every logged request
- Carrier packet-session proof and serial data provenance
- Long-term reconnect, roaming, power-loss recovery
- Remote output actuation, acceptance and economic fulfillment
- Actual EEG data transfer for the TGAT proposal
软件代码、HTTP 记录与完整设备验收是不同证据等级。即使未来希望自动运行，也必须保留设备身份、授权与人类监督。
05 · YOU CAN, TOO / 你也可以
Use GPT as a learning and coordination partner—not a substitute for engineering evidence.
No need to defeat a mature industry or create a new modem. Begin with one tiny, bounded and safe capability, then share what really happened.
START SMALL
Choose one commercially available DTU and an existing harmless source (e.g. a test string). No custom PCB or AI model is required.
选择现有 DTU 和一条无害测试数据。第一步不需要重新设计蜂窝模组。
CAPTURE REALITY
Record model, power requirements, UART interface, SIM/carrier conditions and the date of the test. Keep credentials private.
记录型号、供电、UART、运营商条件与现场日期；SIM 信息和个人凭证留在受控环境。
LET GPT HELP
Use GPT to understand a vendor manual, write non-sensitive parsing/test code and interpret an error log. Inspect code before running it.
用 GPT 阅读厂家手册、编写测试程序、解释报错；执行前仍由人检查程序。
VERIFY ONE HOP
Send one small test payload, keep both device-side and server-side readbacks, and hash the evidence.
只验证一个跳点：一条测试信息和两端回执，保留真实时间戳与 SHA。
ADD ONE CAPABILITY
Only after an accepted uplink, bind one scoped sensor, an e-Person/Work role or other physical capability.
上行成功并经接受后，再加入一个真实传感器或有授权的 Work，不扩大成无限制远程控制。
SHARE & REUSE
Publish a safe abstract, limitations, contribution boundary and a reusable pattern. Invite others to improve, not to imitate unverified claims.
公开安全的技术方法、真实证据与未完成项，邀请全球同学和工程师协作，共振而非竞争。
06 · NEXT RESEARCH / 下一步的真实工作
Turn historical learning into reusable physical connectivity.
Recover the original console and modem readbacks
Link dated source hashes to terminal output, UART captures and the exact module used. Confirm how POST and polling originated.
恢复当年设备端串口、运营商会话与云端事件的对应关系，补齐完整证据链。
Build a reusable, non-actuating DTU Capability Adapter
A neutral template for bounded transport: payload format, status, source attribution, retry/reconnect policy, privacy and human acceptance—without giving unapproved machine-control authority.
将成熟通信模组抽象成可复用的 Connectivity Brick，明确数据、错误、重连、安全和责任范围。
Validate one sensor, one site and one accepted work
Revisit the TGAT EEG one-way uplink candidate only with its own electrical, privacy and human-study gates. Other sensor or field cases may be proposed separately.
从单一真实传感器做现场验收，采集来源、可靠性与隐私边界；EEG 仍属候选研究。
Global contributor pathway
Suppliers, students, hobbyists and engineers can contribute hardware specifications, harmless test evidence, documentation, accepted capabilities, research or economic support—with explicit rights and responsibilities.
让不同国家的参与者带来自己的零件和真实场景，形成独立有价值的 Work，而非替所有人免费重造现有产业系统。
07 · SAME INFRASTRUCTURE · DIFFERENT BRICKS / 与其他研究平级
One small capability can connect to many others.
Product 001 · T736Edge compute / local Runtime
Product 002 · AI-to-LaserGoverned physical action
Product 003 · NFC WritingPhysical / digital identity
Product 004 · DTUPhysical connectivity / data uplink
These are reference research lines, not a claim that the devices are mutually compatible, commissioned together or currently online.
08 · PUBLIC EVIDENCE / 资料来源
Evidence is useful when its limits are visible.
Primary artifacts: May 29 server TCP / viewer sources; May 30 and June 6 Mac serial test files; June 5 web service code and Nginx records; a 42-entry June 5–6 JSONL ledger; a separate EX800K 4G Cat1 vendor manual. Historical notes also mention YunDTU_FS800DTU_X0M1. The vendor manual and named device are **not automatically the same hardware**.
公开页不包含设备 SIM、IP、认证资料、完整原始事件日志、可用远程控制地址或供应商专有程序。公开版本保存来源种类、日期、哈希、验证范围和未完成项，供全球研究团队合规复用。
GLOBAL CO-BUILD · 你也可以
Don't build another telecom industry.
Build the capability your reality is missing.
Every mature module is an opportunity for another person to contribute knowledge, engineering, a safe experiment or accepted local execution. HSIMC helps connect these efforts across sites, people and organizations while retaining provenance, Authority and economic responsibility.
不必代替成熟企业。我们希望与全球的工程师、学生、制造商与研究者形成共振：从一个小零件开始，借助 GPT 理解技术，把真实的成果留成别人也能接续的能力。
Joining a research discussion does not automatically authorize hardware control, data collection, employment, sponsorship acceptance or ownership changes.
GENAI NATIVE DOCUMENT · URL → COPY → PRINT → SHARE
This URL is ready to move.
本链接可以分享、复制与打印；链接不会增加访问和执行权限。
https://hsimc.tech/rd/dtu/PUBLIC HISTORICAL RESEARCH · NOT A LIVE DTU COMMAND CONSOLE
Historical software and transport evidence does not grant current device Authority, prove a live SIM session, license telecommunication services or authorize field actuation. No operational DTU backend is linked from this page.
不自动启用云端下发、设备操作、个人信息采集或订阅收费。真实设备的授权和安全验收需要独立完成。