Posts

Short, practical notes across telecom platforms, infrastructure work, homelab experiments, cycling and everyday fixes.

98 posts in Posts.

Codex in the Jail

I wanted to run codex-cli in a real sandbox on macOS. The goal was simple: keep the tool useful, but stop it from touching anything outside …

Site moved to Hugo

Moving from WordPress to Hugo This site used to run on WordPress for years. It did the job, but it came with the usual baggage: upgrades, …

Hosting and home page

Books 100 Go Mistakes and How to Avoid Them - Teiva Harsanyi I keep this one near my desk. It’s a compact checklist of the mistakes I …

Intro I built this little Snake clone as a hands-on way to learn the Ebitengine (Ebiten) game loop in Go. It runs on a fixed grid with …

IT & Development

“Learn ALL about pixel art in an always growing course!”

As an exploration of something different from my daily work, I took a course about pixel art. What you’ll learn Learn how to create both …

New hardware My lab before 2024 refreshment consisted of three nodes: AMD Ryzen 9 3900XT 12-Core @ 3.8GHz, 128 GB RAM i7-7700 4-Core @ …

Pi-diet as a quorum device for Proxmox

There is a lot of good descriptions how to set it up, however – as Pi-diet does not use classic sshd but `dropbear` `pvecm qdevice setup` …

Proxmox monitoring

A toolset to gather temperature and power consumption metrics then collect in Prometheus. Can be found on GitHub …

Proxmox Cloud-Init

Custom Cloud-Init configuration As stated in Proxmox Doc, you can create a custom Cloud-Init config where you’re free to set all parameters …

TrainerRoad workouts in your Garmin Watch

BackgroundTrainingRegime is a small ConnectIQ Widget for Garmin Smart Watches allows you to check your TrainerRoad workout. NavigationAfter …

Convert Diameter msg hex string to Wireshark pcap

A “raw” hex string can be converted into Wireshark pcap: query="<hex string here>" export …

Live Wireshark diameter capturing from K8s container (in Google Kubernetes Engine)

Handy command to remotely capture tcpdump from a K8s container located in Google Kubernetes Engine and then display it (live!) in Wireshark …

How to fix Permission “artifactregistry.repositories.downloadArtifacts” denied on resource on Ubuntu when pulling from Google Artifact repository

Easiest way to install Docker in Ubuntu is to use snap. But then when you try to pull/push any images from Google Cloud Platform (GCP) …

Proxmox 7 can’t boot to UEFI (Home Assistant and other UEFI images)

Found this at opportunity of installing Home Assistant – from HA OS qemu2 image – boot process just stops into UEFI Shell prompt: BLK0: …

FTP Track of my Cycling FTP changes (I’d love to say “progression” but it is not always like that…) Intervals.icu Strava Garmin Connect …

Page moved to a new hosting!

I hope this will not cause any disturbances 😀

Hosting and home page

Wireshark MATE for Diameter Charging-Control

That’s surprising that for all these years I didn’t know about Wireshark MATE: MATE: Meta Analysis and Tracing Engine What is MATE? Well, to …

How to enable R environment in Golden Cheetah on Mac?

Somehow I couldn’t find a complete guide how to install R and configure it properly in Golden Cheetah (I’m using v3.5). There is a good …

Wireshark LUA plugin

This is an example of a LUA plugin for Wireshark which goes through the packets and generates a statistic. In my case, I was looking for …

Withings to Garmin tool going beyond! TrainerRoad syncing

As I’m user of cycling training platform TrainerRoad, the tool has been expanded to support weight synchronisation to TrainerRoad profile. …

Withings to Garmin

OUI issue NGINST-64002: Error occurred in validation of: “Host Name”

When installing an Oracle application using OUI (Oracle Universal Installer) sometimes it verifies if a given host is reachable. …

Prometheus Node Exporter /lib/init/init-d-script: /usr/bin/daemon: not found

After Ubuntu upgrade 18.04 -> 18.10, Prometheus Node Exporter started to complain: root@grafana:~# /etc/init.d/prometheus-node-exporter …

Param2Clipboard

A MacOS application to grab an argument and set system Clipboard as per argument text. How it works? Under the hood it’s invoking pbcopy as …

Withings to Garmin Connect – resurrection

After dropping “legacy” APIs on Withings page, the script stopped to work… It took quite a while to adjust it to OAuth2 but finally – it’s …

Withings to Garmin

Oracle Coherence – description of federation member states

States of Oracle Coherence federation are not very well described in the documentation. So I thought it would be good to ask at the source. …

Shrinking VirtualBox VMs

This article is note to self, as I just gather information from other sites: …

Proxmox: enp0s31f6: Detected Hardware Unit Hang

Since a few weeks, my Proxmox lab has started having issues with on-board network. The adapter enters in “hang” state, the logs are full of …

How to prepare bootable USB stick for Lenovo PC BIOS flashing

This post is actually a note to self how I’ve done it… Steps taken from: …

PlantronicsHub – major memory leak?

I’ve noticed that process SpokesUpdateService is promoted to the top of my Memory list. Here an example which I captured today (just 24hrs …

New home virtualisation lab

Intro It’s been a while since I’ve built my current home lab. It’s based on Lenovo M910t. In general, I’m quite happy but it’s lacking …

My current Home Virtualisation Lab “Wieloryb”

Wieloryb as a home lab My current home server which I use many for virtualisation, serving also some net services is reaching memory and …

How to workaround MacBook Pro 2017 scroll lag

Another embarrassing problem with my MBP: when scrolling in e.g. Chrome, Safari or actually – any other window, there is annoying lag. When …

MacOS QuckLook Plugin for Java class

Quick Look at Java classes! This Quick Look plugin allows you to decompile Java class and look at the content.

Chef resources failing with wrong constant name

When trying to add a custom resource, no matter what, I always got a wrong constant name error, for example: resolving cookbooks for run …

Prevent Mac hidden files being written to a shared storage

MacOS tends to trash mounted disks with number of useless hidden files (e.g. ._* or .DS_Store ). There were number of recipes in the …

Oracle 12c 32-bit client and direct GOT relocation R_386_GOT32 against `lxecerr’

Edit 12/09/2018 As Ivan commented below: with binutils release 27.28 it seems to be solved. But see the workaround below in case it’s not… …

Deleting unwanted time zones from Apple Calendar

When you add some timezones to your Apple Calendar, it’s somehow difficult to remove them and you end up with a list which you perhaps don’t …

Open Cisco Webex through Alfred workflow

A MacOS Alfred workflow to open a predefined Webex session. Pre-requisites: Alfred – free Alfred Power Pack – commericial, but I strongly …

Time Zones mentioned as a favourite Alfred Workflow!

I’m glad to mention that Alfred Timezone workflow has been mentioned as a “Favourite” on Alfred’s workflows page …

Alfred Timezones

Site migrated to a new server

Due to issues with my current hosting, I decided to move the site to a new server. This might be a temporary location but will decide after …

Hosting and home page

Kindle Vocabulary Builder into Memrise

Introduction A script to pull Kindle Vocabulary Builder DB and convert into Memrise course. The latest Kindle Paperwhite (second generation) …

Installation of pygraphviz in MacOS 10.12 (Sierra)

First attempt to the installation failed because of missing graphviz: (django_python_env) MBP:mysite jhartman$ pip3 install pygraphviz …

Fix for “Withings to Garmin Connect” authorisation problems

It has been reported that the script does not work anymore: jhartman@wieloryb:~/scripts/withings-garmin-v2$ ./sync.py Traceback (most recent …

Withings to Garmin

Belkin KVM: Falied to validate certificate

After one of JVM updates, my Belkin KVM (Remote IP Manager) has started refusing to start with “Falied to validate certificate” error …

How to check if all Calibre books are already in the Amazon cloud?

Preface My primary software for managing Kindle books is Calibre. I’m using Amazon cloud for books synchronisation and sometimes I’d like to …

Time Zones for Alfred

IntroThe workflow has been created by Mr Carlos from New Zealand and published on the Alfred Forum. I’ve enhanced the workflow by adding a …

Alfred Timezones

How to connect a SCTP single-homed node with SCTP multi-homed one?

Typical and most robust way of configuring connectivity over SCTP (e.g. Diameter or Camel links) is to use two independent IP links (VLANs), …

NoSQL: Exiting inner Replica loop with exception com.sleepycat.je.rep.RollbackProhibitedException

$ cd /opt/ece/data/nosql/storage2/kvroot/ECEStore/log $ (for i in $(ls rg*-rn*_0.log); do tail -200 $i | grep "Originally thrown by HA …

Tweak in WordPress Ample theme – longer summary text

The Ample theme seems really great, however, from my point of view, it has small disadvantage: it shows very short post summary on the list: …

Hosting and home page

From Drupal 6 to Drupal 8 and… finally at WordPress

Website update & engine refreshment (announced in [Changes, changes][1] post) took me really a lot of time (it might be 12-18 months or …

Hosting and home page

Warehouse demolition nearby Hrubieszowska Street in Warsaw

As prices for the ground nearby my office are skyrocketing (mainly because of Underground station built in the neighborhood), the landlord …

Surströmming in Sundsvall

Truly unique Swedish experience in Sundsvall… Surströmming can Surströmming can Surströmming on the plate

Changes, changes…

After years, significants changes on the site: New domain! Finally, I managed to get my personal domain <> hence I’m not tied to …

Curriculum Vitae

Name: Jarek (Jarosław) Hartman Country Location: Poland, Warsaw LinkedIn: https://www.linkedin.com/in/jaroslaw-hartman-65a1081/ Last update: …

ASN.1 encoding tutorial

Introduction Recently I in my work I had to encode an Inap (to be more precise – Sinap) content “by hand”. It’s not a rocket science however …

My fight with OpenSS7

Introduction One day I decided it would be fun to play with a real SS7 stack. The only one I could find was OpenSS7.

USB‑Serial adapter on Mac OS X

Even though the serial port is considered a “dead” interface, people still need it from time to time. On a Mac it’s possible — just not …

Q.850 Release Cause tool

I love Wireshark, but sometimes it doesn’t decode all the parameters I need. One example: Q.850 cause codes inside INAP/CAMEL Release Call …

BlackBerry upgrade via MacBook Pro + VMware/Parallels

My advice if you ever plan to upgrade a BlackBerry using Windows in a VM on a MacBook Pro (Mac OS X 10.6): Don’t do it.

Withings → Garmin Connect

For a while I’ve been using a great Withings Scale, which stores measurements in the cloud. Since I also use Garmin GPS devices (and Garmin …

Withings to Garmin

Disable and remove the usbecm2 device on Solaris 11

After a fresh Solaris 11 install on a T4‑1 server, I noticed an unexpected network interface: usbecm2. root@slc:/# ifconfig -a lo0: …

Half‑Life (1998) on Wine

Nearly 20 years after release, I wanted to replay it and see if it still felt the same. Since I’m on macOS, the obvious choice was to use …

Kindle Library List

Extracts documents list from Amazon Kindle webpage and save into a txt, xml and html file. Project stored in GitHub. How to use: Download …

PHP Startup: unable to load /usr/lib/php5/20100525/snmp.so

If you see this error on Ubuntu: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20100525/snmp.so' - …

Wireshark 1.6.1 fails to start on Solaris 10

On a fresh Solaris 10 install, Wireshark (from sunfreeware.com) just wouldn’t start: root@am1slc01 # wireshark No fonts found; this probably …

Projects jTimeTable i Program TV are discontinued

Sadly, but I have to inform all of you that my both iPhone projects are discontinued. Main reasons for that was total lack of time and – to …

Projekty jTimeTable i Program TV – zawieszone

Z żalem zawiadamiam, że oba projekty zostają zakończone. Głównym powodem jest brak czasu i chęci na rozwój. Do tego dołożył się ZTM …

Originally – that was my review wrote on Amazon.com. It’s stil unpublished – maybe because of “sensitive” content. However, I wanted to …

Are you a coffee fan? Are you an engineer? Then you’ll appreciate this kind of coffee machine: Not sure about you, but I was impressed 🙂

Application Context Name (ACN)

The application context (AC) is the mechanism for identifying the protocol and the protocol version of an application part (AP). The object …

Jakarta W Jakarcie spędziłem kilka miesięcy pod koniec 2006 i na początku 2007 roku. Niestety, nie udało mi się zwiedzić całej Jawy, ale …

Jakarta – piersza wycieczka

Pierwszy dzień w Jakarcie… Zapoznałem się z taksówkarzami i dziwnym systemem komunikacji – żeby skręcić w prawo trzeba jechać prosto do …

Program TV (Polish TV guide)

Discontinued… and does not work on new iPhones 🙁 IntroductionThis is a small iPhone app that displays the Polish TV guide. The app uses …

N560 – first impressions

I’ve been using the Fujitsu‑Siemens N560 for about a week. It’s my fourth PDA, so I can’t resist comparing it (mostly to the FS 720). …

Alcatel PBX services

Another student project — this time a description of Alcatel PBX services (Update 2023: the page seems to be offline). Originally hosted on …

Wśród konarów i komarów – wyjazd na północny-zachód Wrocławia (Las opatowicki, Rędzin)

Głównie off-road 🙂 Wycieczka przez: dom Klecińska Na Ostatnim Groszu most Milenijny las osobowicki pola irygacyjne na Rędzinie (uwaga na …

Pierwszy wyjazd w 2006.

Trasa nie była zbyt ciekawa…. Kilka kilometrów po mieście… ….ale głównie testowałem nowe mocowanie GPSa. Ale poza tym niestety okazało się, …

Petersbur – lądowanie (2)

Powrót z Petersburga… Całkiem ciekawe lądowanie – ale nie do końca jestem pewien czy pilot trochę się nie zagapił. Jak dla mnie facet trochę …

Al.Pracy – Siemens/Strzegomska

Trasa z domu do pracy – Al.Pracy-Klecińska-Strzegomska Track Al.Pracy-Siemens.plt

Rower – Wrocław (2)

Wyprawa rowerowa: Partynice Track Rower02.plt

Rower – Wrocław (1)

Wyprawa rowerowa: Aleja Pracy – Aleja Piastów – Avicenny – Żwirki i Wigury – Krzeptów – Kęblowice – Samotwór – Kosnego – Równa – …

Ostatnio moim ulubionym gadgetem stał się GPS VistaC firmy Garmin. – Pogorzelica 2005 Więcej o wizualizacji tracków przy użyciu modułu GMap. …

Moje jedyne wakacje w 2005r… Spędziłem je w lipcu w hotelu Sandra. I gdyby tylko pogoda dopisała…. Udało mi się chociaz zebrać kilka fajnych …

Wrocław – Cmentarz Grabiszyński

Wycieczka zaduszkowa: cmentarz grabiszyński, cmentarz żołnierzy włoskich, cmentarz żołnierzy polskich. EveryTrail Track CmGrabiszynski.plt

Web-to-UUS gateway

During my time at TP S.A. I worked in the Network Division, in a team focused on ISDN services. One of the projects I helped build was a …

Ezenia videoconferencing system

Near the end of my studies I ran into videoconferencing systems. It inspired my thesis topic — IP telephony — and I dug into the H.323 and …

Na spacer po Górach Stołowych wybrałem się w maju 2005. – wyjazd z Wrocławia, trasa przez Dzierżoniów i Bielawę – po drodze warto zahaczyć o …

Kopenhaga / Dania

Na razie tylko track GPS i krótki opis. Wkrótce więcej Moją podróż zacząłem w Berlinie, jednak w pociągach IC szyby nie pozwalają na …

Jeśli z jakiegokolwiek powodu masz ochotę się ze mna skontaktować, najprościej: Napisz na adres <jhartman@interia.pl> Jeśli chcesz …

This blog does not share personal information with third parties nor do we store any information about your visit to this blog other than to …

PointCode Converter

Check interactive WWW Point Code Converter Quick summary This is a small calculator for converting SS7 point codes between different …

SS7 Point Codes

Filmoteka for iSilo

Quick summary A movie database with ratings and short descriptions on your Palm/PocketPC, this time packaged for iSilo. Why I built this …

Filmoteka – a movie database for your handheld

If you have ever tried to pick a movie in a rental store, you know the feeling: too much choice and a blank mind. I wanted a small, portable …

2004.10 – moje wakacje na Rodos

Wstęp Greckie Rodos odwiedziłem na początku października 2004.

Dictionary of Foreign Words

Quick summary{#Krotko} This project brings Słownik Wyrazów Obcych (Dictionary of Foreign Words) to a palmtop. 20,651 entries in a 1.5 MB …

Since 2002 I’ve been happily “addicted” to the electronic gadget known as the palmtop (PDA). I started with the Palm m505 — small, sturdy, …

My pre‑professional background is described in this note. TP SA (2001–2004) Work tends to consume more of me than I’d like — but there are …

A few things about me

About me: I was born on March 14, 1977 in Jastrzębie‑Zdrój (and no — it’s not the seaside town near Jastrzębia Góra; it’s the opposite). I …

Last updated on February 2, 2026