The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for January, 2026

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Bundling DuPont connectors: 3D Printing Everyday for 365 Days 282/365 #stem #3dprinting #3dprint #ideas – YouTube

Posted by jpluimers on 2026/01/15

Nice idea: [Wayback/Archive] 3D Printing Everyday for 365 Days 282/365 #stem #3dprinting #3dprint #ideas – YouTube

It mentions DuPont wire connectors which is colloquial for a common form of jump wires: the ones that can connect to breadboards, or male or female pin headers. Basically a so called “DuPont wire” is an electric wire with a pin header (either male or female) on each end leading to 3 kinds (not counting ones having multiple connectors on each wire) as male – female is the same as male – female:

  • female – female
  • female – male
  • male – male

Being able to group the connector end of multiple jump wires in one enclosing connector for quick opening and closing is a great idea.

Hopefully the 3D printing files will be released somewhere.

One of the comments is also inspiration for a future 3D printing project:

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Posted in Development, Electronics Development, Hardware Development | Tagged: , , , | Leave a Comment »

WireGuard on OpenWRT based GL.iNET: some notes on the `wireguard_watchdog` script

Posted by jpluimers on 2026/01/15

On OpenWRT GL.iNET based devices, the WireGuard client does not restart upon reboot, even if it was started before rebooting.

Hopefully the /usr/bin/wireguard_watchdog script will help with this as others indicates it should.

My first try was no succes, but since it is supposed to run from cron it does no output. The script on GL-SFT1200 firmware version 3.215, script /usr/bin/wireguard_watchdog is different from the one in the OpenWRT repository, so it needs some investigation.

Some links for checking this out:

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Posted in *nix, *nix-tools, ash/dash, ash/dash development, Development, GL-AR300M, GL.iNet, GL.iNET GL-SFT1200, OpenWRT, Power User, Scripting, Software Development | Leave a Comment »

Do not implement numeric input with like this Post NL user interface

Posted by jpluimers on 2026/01/14

I had to pick up a package keying in a 6 digit code using the below PostNL UI.

It was horrible. Don’t implement your numeric input UI like this: use a telephone keypad like or calculator numpad like keypad UI.

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Posted in Development, Software Development, UI Design, User Experience (ux) | Leave a Comment »

Some WireGuard console tricks that helped me figure out a GL.iNET “status yellow” connection problem

Posted by jpluimers on 2026/01/14

TL;DR: the connection problem was because of a public key mismatch between the pfSense central location and GL.iNET peer.

Since the pfSense cannot export configuration in either text or QR format (see rcmcdonald91/pfSense-pkg-WireGuard: This is a port of the original WireGuard UI bits as implemented by Netgate in pfSense 2.5.0 to a package suitable for rapid iteration and more frequent updating on future releases of pfSense.), I made a copy paste mistake.

This resulted in the WireGuard client connection indicator on the GL.iNET to turn yellow instead of green. This means that the handshake is only partially completed (there is a WireGuard connection but there is no returning traffic on it).

GL.iNET VPN status explanation:

  • no color: no VPN
  • yellow: VPN not fully established
  • green: VPN established

How I found out

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Posted in GL.iNet, GL.iNET GL-SFT1200, Hardware, Network-and-equipment, pfSense, Power User, routers | Leave a Comment »

Is Fortran better than Python for teaching the basics of numerical linear algebra? – Dr. Jean-Christophe Loiseau

Posted by jpluimers on 2026/01/13

The summary of [Wayback/Archive] Is Fortran better than Python for teaching the basics of numerical linear algebra? – Dr. Jean-Christophe Loiseau is:

  1. 1-based indexing prevents off-by-1 errors
  2. structure is key, especially these foundations:
    • clear begin/end constructs instead of visual clues
    • strong typing
  3. verbose programming languages are easier to learn than non-verbose ones

Modern Fortran helps a lot here and shows that after the initial 13 year gaps between FORTRAN 77 and Fortran 90, and between Fortran 90 and Fortran 2003 (the ANSI Standard Fortran and Fortran 95 in between versions were just minor updates), Modern Fortran has come a very long way and now as a thriving community and an extensive list of Fortran software and tools.

Other typed languages and tool sets like C# and Delphi come to mind here as well though you need libraries with 1-based data structures to solve the first point.

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Posted in Development, Fortran, Learning/Teaching, LifeHacker, Power User, Python, Scripting, Software Development | Leave a Comment »

Does Odido (the old T-Mobile Netherlands) which took over Tweak Internet (they supported IPv6) already support IPv6?

Posted by jpluimers on 2026/01/12

I am writing this early 2025, shortly after Odido introduced “Klik & Klaar” for EUR 25/month: yet another of their internet products, this time over 5G, and yet again: no IPv6 support, just like their DSL and fiber products.

This post is a reminder to check if by now Odido has started supporting IPv6.

I know that at the time of writing, of the large Dutch mobile providers, only KPN supported IPv6, but both Vodafone and Odido didn’t. However, for Vodafone it is not a technical limitation: their bean counters need an upgrade to their billing system. The Odido back-haul technically isn’t ready for IPv6 at all.

Regrettably, The Netherlands has been behind on IPv6 adoption, which is a shame for a knowledge worker country. UK, Belgium, Germany, France, Greece, Hungary and even Russia are doing far better on IPv6 adoption:

Hopefully that has changed by now.

Edit 20261214: no, that has not changed, see a reaction at [WaybackFailed/ArchiveFailed] Odido verhoogt prijs van Klik&Klaar met 1 euro naar 26 euro per maand – Tweakers (which regrettably can neither be archived in the Wayback Machine nor Archive.is):

En Odido heeft ook nog eens geen IPv6. Anno 2026 loop je dan echt enorm achter.

Translated:

And Odido still does not support IPv6. Anno 2026, they are far behind.

Related / background information:

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Posted in FreedomInternet, Internet, ISP, KPN, Odido (ex Dutch T-Mobile), Power User, Tele2, xs4all, Ziggo/UPC/A2000 | 1 Comment »

WireGuard site-to-site VPN between GL.iNET and pfSense

Posted by jpluimers on 2026/01/12

Some links and notes that might help me getting WireGuard site-to-site VPN working between GL.iNET and pfSense.

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Posted in GL.iNet, GL.iNET GL-SFT1200, Hardware, Network-and-equipment, Power User, VPN, Wireguard | Leave a Comment »

Shrishailya Chavan on X: “@jatinkrmalik Speculation is fine until the entire supply chain starts optimizing for a world that only exists on pitch decks. At some point, physics, cash flow, and grid capacity pull everything back to reality.”

Posted by jpluimers on 2026/01/12

The reason why RAM has become four times more expensive is that a huge amount of RAM that has not yet been produced was purchased with non-existent money to be installed in GPUs that also have not yet been produced, in order to place them in data centers that have not yet been built, powered by infrastructure that may never appear, to satisfy demand that does not actually exist and to obtain profit that is mathematically impossible.

https://x.com/jatinkrmalik/status/2009689523513618887

https://x.com/Shrishailya_5/status/2009879354315288862

https://x.com/Shrishailya_5/status/2009908756830957891

Posted in Uncategorized | Leave a Comment »

Empirical units, π, 𝑒 and 𝜙 (pi, e, and phi)

Posted by jpluimers on 2026/01/09

Being a non-native English speaker and having monaural hearing¹, the first time visiting the USA I thought they mentioned Empirical Units² when they tried to explain miles, feet and other measurement units they use on their island.

Then I learned they are in fact United States customary units but in the USA, they actually name those Imperial Units, implying that the UK still has a very strong influence on the USA. In reality, there are differences³ between Imperial Units and United States customary units to keep things in the USA practical (or lazy if you want), so I will keep calling their system Empirical Units as it is more fit for purpose (can’t name them Freedom Units any more given their Project 2025 regime).

Anyway, quite a while ago there was this cool XKCD “The Maritime Approximation” (image on the right) including only Imperial Units holding for Empirical Units as well: π mph ≈ 𝑒 kn (let’s use ISO unit symbols here, shall we) which is correct to < 0.5%.

Recently, I learned that with the same accuracy, there is a golden ratio between metric and Imperial/Empirical Units: 𝜙 km = 1 mi, also correct to < 0.5%.

Kevlin Henney wrote two great blog posts on these explaining way more background information:

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Posted in LifeHacker, Power User | Leave a Comment »

Fontendo (@Fontendou) / Twitter: Identifying & documenting fonts, obscure and otherwise from video games and other media.

Posted by jpluimers on 2026/01/09

Interesting as I know very little about fonts in Japan and the evolution:

[Wayback/Archive] Fontendo (@Fontendou) / Twitter

Identifying & documenting fonts, obscure and otherwise from video games and other media.

It is by [Wayback/Archive] Kaihatsu (@KaihatsuYT) / Twitter

Creativity through culture, & cultural literacy through games. Type designer in Japan.

Via: [Wayback/Archive] What’s the deal with this font? – YouTube

–jeroen

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Posted in Font, Power User | Leave a Comment »

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