Skip to main content

Raymii.org Logo (IEC resistor symbol) logo

Quis custodiet ipsos custodes?
Home | About | All pages | RSS Feed | Gopher

Hi there!

I'm Remy, a developer with a focus on C, C++, linux and embedded systems.

I currently work for De Jong DUKE were I develop software for an embedded platform that powers coffee machines. This is a C++, C and Qt stack running on Yocto linux and Nucleus RTOS. It controls hardware, runs the UI and has a few utilities for IoT connectivity and configuration. Technology is mostly C++ but includes Microsoft Visual C++, Flash, Qt and ARM kernel drivers.

I've been a Linux and UNIX sysadmin for over 10 years.

To read more or get in touch, click here.

This is my personal website, these articles do not reflect or are based on work, opinions or policies of any of my (previous) employers. Any resemblance to reality is pure coincidence.

Latest Items

Personal Wireguard VPN on a Freedombox with Debian

03-02-2020 | Remy van Elst

This guide will show you how to set up a personal Wireguard VPN server on Debian or Ubuntu with Freedombox. Freedombox will be used to manage the VPN software, firewall and users. Wireguard is a relatively new VPN built in to the linux kernel. Freedombox is a long running project under the Debian umbrella providing a private server for non experts with focus on user freedom, ease of use and privacy. Combined, those two make a great pair. In the past I've written many articles on how to setup your own personal VPN server, but those all required manual setup and maintenance. With freedombox, the updates are automatic and the management is hidden away behind a convenient web interface.

Read more...

Installing Freedombox on Armbian on the Olimex Pioneer

29-01-2020 | Remy van Elst

FreedomBox is a private server for non-experts: it lets you install and configure server applications with only a few clicks. It runs on cheap hardware of your choice, uses your internet connection and power, and is under your control. Last year the Pioneer became available, officially supported and sanctioned by the Freedombox Foundation. This is a home server you can buy from Olimex, comes in a nice metal case with a proper power supply, network cable, battery and SD card preloaded with Freedombox. Plug in and go. Perfect for users that don't want to tinker but do want their freedom and control. With the Pioneer, both the hardware and software are fully open source. In the default provided distribution for the Pioneer there are a few things I dislike. This guide covers the installation of Freedombox and Debian for the Olimex A20 Lime2 Pioneer with Armbian including reinstalling, Apache SSL certificate and LDAP issues.

Read more...

Cancellation notice: cipherli.st, txtn.ws, ssldecoder.org and certificatemonitor.org

22-01-2020 | Remy van Elst

This is a short notice that the public services I was providing, cipherli.st, txtn.ws, ssldecoder.org and certificatemonitor.org are suspended and cancelled as of now. The source code is still available via my github, but the domains and hosting are stopped. If you want to use these services, you now must host them yourself.

Read more...

nginx 1.15.2, ssl_preread_protocol, multiplex HTTPS and SSH on the same port

Published: 06-08-2018 | Last update: 12-01-2020 | Author: Remy van Elst

The NGINX blog recently had a nice article on a new feature of NGINX 1.15.2, $ssl_preread_protocol. This allows you to multiplex HTTPS and other SSL protocols on the same port, or as their blog states, 'to distinguish between SSL/TLS and other protocols when forwarding traffic using a TCP (stream) proxy'. This can be used to run SSH and HTTPS on the same port (or any other SSL protocol next to HTTPS). By running SSH and HTTPS on the same port, one can circumvent certain firewall restrictions. If the session looks like HTTPS, nginx will handle it, if it looks like something else, it will forward it to the configured other program. I used to use SSHL to get this functionality, but now it's built into the nginx webserver. This small guide will cover the installation of the latest version of nginx on Ubuntu (16.04) and configuring this multiplex feature.

Read more...

Windows 10 updates with PowerShell

06-01-2020 | Remy van Elst

Recently I had issues updating one of my machines that runs Windows 10. Turns out the firewall was to restrictive. However, the information provided by the update dialog was just, 'Oh, updating failed, maybe try again'. Nothing useful, so I tried to figure out if it's possible to use Powershell for updating. Since Windows 10 build 1709 Microsoft provides a built in module, but that is not that user friendly. In this article I'll talk about using PSWindowsUpdate and the built in Microsoft WindowsUpdateProvider to update a Windows 10 machine via the commandline

Read more...

Run CLion native on Android, ditch your desktop!

27-12-2019 | Remy van Elst

How often do you read articles that state that people have replaced their main computer with an iPad and are fully content? Now, how many of those articles just use a linux server (vps) somewhere with some native apps, but mostly SSH to that server? Well, what if I told you that you can run a full blown IDE, the best IDE for C++ there is, CLion by JetBrains, on Android? Including compiling, just native GCC, CMake, GDB and all the stuff you are used to? Just for fun I've installed CLion on an old Samsung Tab S2 I had lying around, using Ubuntu in a chroot. It works way better than I'd expected, with a Bluetooth keyboard and mouse it's almost as if your on a desktop. I wonder if you could run Android Studio and use the tablet to compile app's for itself. This article shows some photo's, including a mechanical keyboard, different window managers and had instructions to replicate this setup.

Read more...

Tiny Tiny RSS + Readability == The best way to read RSS feeds

22-12-2019 | Remy van Elst

Back in 2012, I already wrote about Tiny Tiny RSS. We're now almost eight years later and I still use TT-RSS as my main RSS reader. I'm following almost a thousand feeds (944) and it is my main way of reading and discovering stuff online. All those personal blogs that post once half a year, mainline tech news sites and a bunch more sites. Back in 2012 I had 300 feeds, used the Android app. Nowdays, more feeds, still use the android app, used an iPhone app for a while and the server that it runs on has been migrated and upgraded a few times. I want to share my Tiny Tiny RSS setup with you, which uses the af_readability plugin. Combined with the Android app, I've got an ideal setup to read just content without distractions.

Read more...

ScreensaverStopper, stop activating the screensaver by sending F24 often

21-12-2019 | Remy van Elst

ScreensaverStopper sends the F24 keystroke every 40 seconds. This way, Windows should not activate the screensaver. Useful if you do not have rights to disable the screensaver, but can run executables. Wwritten in C++, compiled with GCC 8.1 via MinGW/cMake. Filesize is around 14 KB, memory usage after a day of running around 600KB. License is GNU GPLv3.

Read more...

and & or are valid in C++ (alternative tokens)

16-12-2019 | Remy van Elst

A post on lobste.rs on the C feature trigraphs triggered me to write this piece on the C++ feature, alternative tokens. I've recently suprised a co- worker by using an if statement with 'or' instead of '||', which works fine, but he never saw it before. It's in C++ since C++ 11, but MSVC requires a specific compiler flag ('/Za') or the 'iso646.h' header. This post has a few samples on the usage inclusing other alternative tokens like bitor, xor and or_eq.

Read more...

Broken Corrupted Raspberry Pi SD Card

Published: 09-01-2015 | Last update: 13-11-2019 | Author: Remy van Elst

One of my Raspberry Pi's would not boot up after a reboot. The SD card was corrupted, sadly beyond repair. This article walks you through the steps I took to try to fix the SD card, including fsck, badblocks and other filesystem utilities. It also has tips to reduce the writing on the Raspberry Pi, this to save SD cards from some amount of wear and thus possible corruption.

Read more...

Weight for Weight, a coding exercise that kept me busy

12-11-2019 | Remy van Elst

I'm using codewars to practice my development skills. The exercise I was working on the past couple of days was a level higher than the 'rank' codewars gives me, so a more difficult exercise. Using the sparse free time I have, this kata took a bit longer to complete, and had me thinking about the problem when I was not doing the exercise. If a problem fascinates me that way, I can't stop thinking about it until I've solved it. In this article I'll walk you through my work on this kata.

Read more...

View all Items