sandikodev

Building U-Boot and Linux 3.11 from scratch for the BeagleBone, and booting

• Author: Philippe Proulx
• Date: Fri Sep 13 18:05:26 EDT 2013

Introduction

sandikodev

Install and Create Emulators using AVDMANAGER and SDKMANAGER

TL;DR

For generic skin emulator with default apis (without google apis):

1. List All System Images Available for Download: sdkmanager --list | grep system-images

2. Download Image: sdkmanager --install "system-images;android-29;default;x86"

sandikodev

SIM Card Management Over GSM Modem

A small guide on how to send and receive USSD codes on Linux

I am using the built in GSM (UMTS) modem of my Thinkpad X1 extensively because I am often in places with flaky internet connections. I connect through the standard Network Manager on Ubuntu and everything works fine. There was one major annoyance though. Every time I wanted to top up the SIM balance or book a new package, I needed a phone to send and receive USSD codes. So I took some time to figure out how to do it from the shell. I wrote this down as a help for others and a reminder for myself. Without further ado...

First intsall gammu and picocom.

➜  ~  sudo apt-get install -y gammu picocom

sandikodev

Building an ultrasonic sensor backpack

Note: This is a bit of a scratch to see what's involved in getting the ping sensor to work as an I2C backpack.

Dependencies.

I did this on a Trinket as that's what I had to hand to make programming a bit faster. If you use a trinket you will need the custom arduino. Check out the Adafruit Trinket info https://learn.adafruit.com/introducing-trinket/introduction

You also need a custom form of the TinyWireS library that manages sending multiple registers on one read request (the

sandikodev

# Stream a video
ffmpeg -re -i video.avi -vf "scale=40:ih*40/iw, crop=40:16" -f rawvideo -vcodec rawvideo -sws_flags bilinear -pix_fmt rgb24 - > /dev/udp/matelight.cbrp3.c-base.org/1337

# Loop a gif
ffmpeg -re -ignore_loop 0 -i image.gif -vf "scale=40:ih*40/iw, crop=40:16" -f rawvideo -vcodec rawvideo -sws_flags bilinear -pix_fmt rgb24 - > /dev/udp/matelight.cbrp3.c-base.org/1337

# Stream webcam
# Mac
ffmpeg -re -f avfoundation -r 30 -s 1280x720 -i "0" -vf "scale=40:ih*40/iw, crop=40:16, pp=autolevels:f, eq=1.5" -f rawvideo -vcodec rawvideo -sws_flags bilinear -pix_fmt rgb24 - > /dev/udp/matelight.cbrp3.c-base.org/1337

sandikodev

OpenVPN Server and certificate management on MikroTik

Contents

• Setup OpenVPN server and generate certificates
• Add a new user
• Setup OpenVPN client
• Decrypt private key to avoid password asking
• Delete a user and revoke his certificate
• Revert OpenVPN server configuration on MikroTik

sandikodev

PlatformIO with Vim (neomake, clang, coc-vim, ale)

Requirements

PlatformIO

• URL
• Arch Linux AUR

clangd

sandikodev

Prerequirements

Config Options

export FQDN="mail.example.org"
export DOMAIN="example.org"
export MAILBOX="user"
export DEBIAN_FRONTEND="noninteractive"
export A_RECORD=$(curl -sSL https://icanhazip.com)

sandikodev

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

.container {
    width: 100%;
    padding: 0 15px;
    margin: 0 auto;

sandikodev

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Poppins';
}
.row {
    margin: 0 -15px;