Kyle Gerard Felker felker

Controlling the Brother P-Touch Cube label maker from a computer

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.

Process

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.

If you are getting this in gdb on macOS while trying to run a program:

Unable to find Mach task port for process-id 57573: (os/kern) failure (0x5).
 (please check gdb is codesigned - see taskgated(8))

Open Keychain Access
In menu, open Keychain Access > Certificate Assistant > Create a certificate
Give it a name (e.g. gdbc)

Technical details for https://stackoverflow.com/a/44169445/6730571

Details of investigation:

On a base system, /usr/bin/java is a symlink that points to /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java, which is an Apple wrapper tool that locates and executes the actual java.

(Do not touch anything in those 2 system directories. It should actually be impossible due to "System Integrity Protection" anyway.)

If you don't have Java installed, attempting to execute java will open a dialog that invites you to install it.

In general, check the crt/host_config.h file to find out which versions are supported. Sometimes it is possible to hack the requirements there to get some newer versions working, too :)

Thrust version can be found in $CUDA_ROOT/include/thrust/version.h.

Download Archives: https://developer.nvidia.com/cuda-toolkit-archive

Release notes for CUDA Toolkit (CTK):

latest: https://docs.nvidia.com/cuda/cuda-toolkit-release-notes/index.html
archive: https://docs.nvidia.com/cuda/archive/

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Powerlevel10k

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

	#!/usr/bin/env python
	from mpi4py import MPI
	import numpy as np
	import time

	import pycuda.autoinit
	from pycuda import gpuarray

	comm = MPI.COMM_WORLD
	comm_rank = comm.Get_rank()

	"""
	Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
	BSD License
	"""
	import numpy as np

	# data I/O
	data = open('input.txt', 'r').read() # should be simple plain text file
	chars = list(set(data))
	data_size, vocab_size = len(data), len(chars)

	// Sample file using the Google C++ coding standard.
	//
	// http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml
	//
	// General rules:
	// - Indents are two spaces. No tabs should be used anywhere.
	// - Each line must be at most 80 characters long.
	// - Comments can be // or /* but // is most commonly used.
	// - File names should be lower_case.c or lower-case.c
	//