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niimbot-proto: черновик
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---
title: "Реверс-инжиниринг"
description: "Изобретаем заново"
---

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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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