Last time we have successfully connected to devices. Now we can try to send some commands.

ADB commands are a lot like HTTP requests.

• Each request has a url called “service string” to specify it’s type.
• Simpler requests embed parameters in “service string”, like GET requests.
• More complex requests send extra data to the stream before daemon responses, just like POST requests.

But actually ADB streams are fully duplex, client and daemon can send data to each other at any time.

Let me explain it in more detail.

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Originally, ADB transfers through USB and TCP, which are both “stream”s that doesn’t have a packet boundary. So ADB defined its own packet format.

In this post I will explain:

1. ADB packet format;
2. CNXN and AUTH, the two packet types used to establish a connection to a device;
3. How did I implement this.

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Following the overview, in this post I want to talk about:

1. Tools I used
2. Some research I did before starting coding

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With the appearance of WebUSB API, which allows JavaScript running in browsers to communicate with devices over USB, an interesting idea came into my mind: Can I implement the Android Debug Bridge (ADB) protocol in JavaScript?

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Previous: VPS, Koa and Let's Encrypt

Although ACME v2 is not final yet, Let’s Encrypt has announced a production endpoint back to March, and Greenlock 2.2.0 has added support for ACME draft 11, so maybe it’s time to give it a try.

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因为最近梯子还是不稳，于是入了个 Linode 的 VPS，Tokyo 的节点，顺便也把 blog 迁到 VPS 上，再上个 Let’s Encrypt 的 HTTPS。

作为 Web Developer，我完全不想折腾 ngnix，所以直接用 node 启个静态文件服务器。

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最近开始研究 Android 开发，装了 Visual Studio 2017 的 Xamarin 组件和 Android Studio，暂时只试用了 Xamarin。但是因为用的虚拟机，而且我司 Wi-Fi 奇慢，所以不得不寻找其它的方法进行调试。虽然让本子做热点也是可行的方案，但是还有更优雅、高效的方法，就是端口映射。

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因为完全找不到歌词，所以试着空耳了一下。以我的日语水平，肯定是错误百出。并且有一处不确定。

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Unicode補完計畫（Unicode-at-on，簡稱UAO，官方網站使用的識別系統用字是Unicode補完計画）是台灣電腦使用者針對大五碼（Big-5）延伸的紊亂、以及微軟Code Page 950（Microsoft Windows內建的Big-5轉碼表）未收錄某些常用字（又稱缺字問題）以及缺乏對於倚天中文系統、中國海字集延伸中的簡體中文、日文假名與日文漢字支援等問題所採取的其中一種解決方案（參看大五碼#影響）。透過對Code Page 950的修改，使得原始採用簡體中文或日語的內容，在複製至ANSI架構的程式時能轉換為Unicode補完計畫字集下的對應字元，而不會造成缺字的問題（詳細字元請參看字元的來源）。它是一個自由軟體。

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春节期间因为要回老家非常的无聊，所以提前买了几本书。基本上看完了所以记录一下。

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