niimbot-proto: черновик

content/categories/reverse-engineering/_index.md

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+---
+title: "Реверс-инжиниринг"
+description: "Изобретаем заново"
+---

content/posts/niimbot-proto/index.md

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+---
+title: Изучаем протокол принтеров Niimbot
+description: Изучаем протокол принтеров Niimbot и печатаем этикетки, отправляя пакеты
+date: 2024-06-29T21:10:28+03:00
+draft: false
+tags:
+- bluetooth
+- niimbot
+- термопечать
+- Niimbot B1
+- Niimbot B110
+- реверс-инжиниринг
+- javascript
+- typescript
+- web
+categories:
+- reverse-engineering
+featured_image: miniature.jpg
+lastmod: 2024-07-25T21:04:37+03:00
+telegram_entry_id: ""
+type: default
+---
+
+После того, как поигрались с [niimprint](/niimbot-d110-pc), захотелось чего-то большего. У меня появилась идея написать полноценный веб-интерфейс для печати, в котором можно будет и рисовать этикетки, и печатать. Для этого я решил изучить протокол принтеров.
+
+<!--more-->
+
+Вооружившись Wireshark и android телефоном, снял дампы обмена данными с принтером по bluetooth. Для этого нужно было включить опцию "Bluetooth HCI Snoop Log" в настройках разработчика, а потом на компьютере после печати запустить `adb bugreport <filename>`.
+
+Изучив пакеты и сверившись с другими открытыми данными, получилась такая структура пакета:
+
+![niimbot packet](packet.png)
+
+* **Prefix** – префикс `0x03`, присутствующий только при одной команде - **Connect**.
+* **Head** – всегда 2 байта `0x55` `0x55`.
+* **Command** – ID команды (пакета).
+* **Data length** – количество байтов данных, идущих далее.
+* **Data** – непосредственно данные в количестве **Data length**.
+* **Checksum** – вычисляется с помощью XOR всех байтов от **Command** до последнего байта **Data**.
+* **Tail** – всегда 2 байта `0xAA` `0xAA`.

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