zflat

• Create a directory for your new workspace

  mkdir dev_ros2
  cd dev_ros2

• Download the zip and extract inside your workspace directory as .devcontainer

  wget -qO- https://gist.github.com/zflat/445b2ef3427dd947e2a3d46b61420b9b/archive/main.tar.gz | tar -xz --transform "s/^445b2e.*main/.devcontainer/"

• Create the workspace volume. Run from the root of your workspace:

zflat

#!/usr/bin/env python3
#
# This is a test script that can be used to test latency of sending ROS messages between containers
#
# First get a baseline by running everything in the same container
# Terminal 1:
#   ```
#   python3 talker_ros2_latency.py
#   ```
# Terinal 2:

zflat

Emacs Init File

This is a configuration file used to customize Emacs. To use this file, ensure the prerequisites are met and then follow the steps in the initial setup instructions section below to download this file from the upstream gist to a file named config.org in your emacs config directory.

Once the config.org file is in your emacs config directory and the setup is complete, you will be able to run Emacs with the customizations defined in the emacs configuration details section of the config.org file. Further customizatons and tweaks can be made by editing the appropriate sections of ~/.emacs.d/config.org.

Table of Contents

• Emacs Init File
  • Prerequisites
    • Install Emacs if it is not already installed

zflat

Minimal example of embedding ign-gui into a QML application.

Host:

git clone https://gist.github.com/138385fb3934fd75ddfcfe42f802e2cf.git downstream
git clone https://github.com/zflat/ign-gui.git -b ign5-application_base
git clone https://github.com/ignitionrobotics/ign-rviz.git
docker build -t my_ign:latest ./downstream
xhost + local:root

zflat

#!/usr/bin/env bash
# Script to print CPU temperature in a while loop to STDOUT
if [ -z $1 ]; then
    echo "Required THERMAL_ZONE arg not given." 1>&2
    echo "List thermal zones and types with:" 1>&2
    echo "  grep . /sys/class/thermal/thermal_zone*/type" 1>&2
    echo "" 1>&2
    echo "Usage:" 1>&2
    echo "  $0 THERMAL_ZONE [SECONDS_BETWEEN_READINGS]" 1>&2
    exit 1;

zflat

#!/bin/bash

# Synology DLNA server does not recognize mp4 audio files 
# but does recognize them if ther are .M4A. 
# https://www.synology.com/en-global/dsm/software_spec/audio_station

find "${HOME}/Music/tmp" -name "*.mp4" | while read filename
do
    name=$(echo "${filename}" | sed -e "s/.mp4$//g")
    echo "${name}"

zflat

Bridge a docker container to a physical network adapter NIC

Set up a network bridge to the physical interface (NIC) on your host connected to a specific LAN

docker network create -d macvlan \
 --subnet=192.168.111.0/24 \
 -o parent=enx000ec6be0a54 br_net

zflat

git clone https://gist.github.com/5678a1d78d80e758301d9da3bc4fb4f1.git /opt/source

zflat

#! /usr/bin/ruby
# coding: utf-8
#
# Split a CSV into vcard files
infile = File.new(File.join(File.expand_path(File.dirname(__FILE__)), ARGV), "r")
while (line = infile.gets)
  vals = line.split( ",")
  continue if vals.empty?
  fname = File.join(File.expand_path(File.dirname(__FILE__)), "vcard","#{vals[0]}.vcf".gsub( " ", "").strip)
  File.open(fname, "w:UTF-8") do |f|

zflat

#include <stdio.h>
#include <stdlib.h>

unsigned long bit_sum(unsigned long n) {
  return n ? (1 + bit_sum(n & (n - 1))) : 0;
}

void main(int argc, char ** argv) {
  char * p;
  long n;