This Gist is superseded by https://github.com/Ircama/PT-P300BT
The Brother P-touch Cube PT-P300BT labelling machine is intended to be controlled from the official Brother P-touch Design&Print 2 app for Android and iOS devices, instead of from a computer.
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The Brother PTP300BT label maker is intended to be controlled using the official Brother P-Touch Design & Print iOS/Android app. The app has arbitrary limits on what you can print (1 text object and up to 3 preset icons), so I thought it would be a fun challenge to reverse engineer the protocol to print whatever I wanted.
Python code at the bottom if you want to skip the fine details.
Intitially I had a quick peek at the Android APK to see if there was any useful information inside. The code that handles the communication with the printer in Print&Design turned out to be a native library, but the app clearly prepares a bitmap image and passes it to this native library for printing. Bitmaps are definitely something we can work with.
