Recent content in Home on bobek.cz

2026-07-27: first version 
2026-08-14: wireless control
 
 Many years ago (back in 2021) I bought a decommissioned flip-dot panel BUSE BS 210.C from the Prague public transport company. The original plan was to use it in a robotics club, but in the end that never happened. 
 There is no public documentation for the panel, and BUSE Blansko (the manufacturer) did not respond to…
Some books teach you something new. The best ones hand you the words for something you already believed. 
 This is the second kind. 
 
			 Incorruptible: Why Good Companies Go Bad by Eric Ries 
		 
 

 For years I’ve built and advised companies around a single conviction. The only durable way to prosper is to create value – never to…
I just had this weird need to self-host OSM for just internal use, not accessible from the Internet. These are notes on how to do it. 
 Source data 
 The easiest is to download an appropriate .osm.pbf 1 file from https://download.geofabrik.de/   external link 
 . Unfortunately they are not directly usable for (at least those I’ve found) web renderers. 
 Downloading…
Vánoční skřítek a Paní Zima 
 Vánoční skřítek vyšel ze své chaloupky, ve které prospal jaro, léto a podzim. Už se těšil na Vánoce, i když to znamenalo hodně práce. Byly to jeho páté Vánoce. Byl ještě moc mladý. Vánoční skřítek se překvapeně koukal kolem sebe. Nikde žádný sníh - že by ještě trval podzim a on se předčasně vzbudil? 
 Podíval se na kalendář, ale opravdu byl už zimní měsíc -…
It was a murky autumn morning. Čeněk, lost in his thoughts, looked out the window at the slopes rising steeply from the river. He put down the book he was just reading. On the cover, in large red letters, it said - “Why We Choose Psychopaths 1 ”. 
 It had been exactly half a year since he left a high managerial position at one multinational company. The departure wasn’t…
Chrliče (gargouille) 
 Chrliče nás fascinují i dnes, protože člověk se v podstatě nemění. Mění jen své okolí, prostředí ve kterém žije. Jeho emoce, noční můry, potřeby atd. jsou v podstatě stejné po celé věky trvání lidstva. 
 Slovo gargouille pochází z latinského gargula a to znamená hrdlo a tím i zvuk vody, která jím stéká. 
 
Podle francouzské legendy byl Gargouille drak, který…
Aristotle   external link 
 doesn’t need an introduction, as well as his views on political systems   external link 
 . He sees three true constitutions (royalty, aristocracy, and polity) and corresponding perverted constitutions (tyranny, oligarchy, and democracy). Wikipedia has a very helpful figure: 
 
			 Aristotle’s constitutions; source:…
One of the key roles of the leadership team in the company is to make clear decisions 1 and unlock decision making   internal link 
 on other organizational levels. Topics are frequently complex and need data and intricate relationships among them to describe the problem-space. Yet, many leadership teams are using presentations 2 to synchronize teams and describe the problem.
Josh Baker announced   external link 
 a new project github/tidwall/pogocache   external link 
 . 
 
 Pogocache is fast caching software built from scratch with a focus on low latency and cpu efficency. 
 Faster: Pogocache is faster than Memcache, Valkey, Redis, Dragonfly, and Garnet. It has the lowest latency per request, providing the quickest response times.…
I don’t know how, but have completely missed the John D. Rockefeller Jr credo. It very well written and does resonate a lot. 
 
 I believe in the supreme worth of the individual and in his right to life, liberty, and the pursuit of happiness. 
 I believe that every right implies a responsibility; every opportunity, an obligation; every possession, a duty. 
 I believe that the…
V dnešní uspěchané a stresující době každý potřebuje koncentrovat svou energii několikrát denně. Využití dýchání je efektivní a rychlé. 
 Každé ráno 
 Každé ráno udělat pro sebe následující minimum: 
 
 
 Mírný stoj rozkročný (nohy jsou rozkročeny do šíři ramen),
ruce podél těla, mírně od těla (nedotýkají se nohou), prsty roztažené , 
 
 
 Soustředíme se na…
Procrastination is often misunderstood as merely poor time management or laziness, but research increasingly shows it’s primarily an issue of emotional regulation, not time management 1 . Procrastination occurs when our drive to delay becomes irrationally stronger than our drive to act. This happens when self-control and motivation are weakened by issues like exhaustion and are opposed by…
When the organization grew 1 beyond about 60 people, it felt different. We have agreed that a new management layer (between myself and tech-leads) is needed. But, I’ve started to lose a grip on what is happening in details. Suddenly, there were projects I was not aware of. There have been technical decisions being made, which I was never consulted about. On one side it felt good – the…
I’ve come to like the saying “don’t ask for permission, ask for forgiveness” 1 . It reflects the reality that most decisions don’t need approval, and waiting for blessing only causes delays, overburdens approvers (usually managers or senior colleagues), and most importantly, doesn’t support the freedom and independence of team members. 
 What does this…
Origins 
 We don’t know when the symbol as such appeared. Probably very long ago. The triangle is a popular symbol in itself, and three points naturally present themselves as its symbol / representation. If we look at other triangular symbols, such as the triquetra 1 
(from Latin tri – three, and quetrus – equipped with a horn, thus three-horned, originally meaning…
I’ve got a strong urge 1 to create a toolchain for producing nice two-column PDFs from Markdown sources. Also it was a good excuse to play with Typst   external link 
 , which is a modern typesetting system 2 . 
 It turned out that multi-column typesetting is no easy task. But completely new flow layout engine   external link 
 was recently merged into Typst, which…
Top trending repository on GitHub today is Docling   external link 
 version 2. Docling is a MIT licensed document parser, OCR and converter from IBM Deep Search Team. Their technical report   external link 
 details use of two specialized models – DocLayNet for layout analysis and TableFormer for table structure recognition. They provide simple CLI tool as well as…
Our chicken coop door is controlled by an ESP8266 board running Tasmota. Tasmota allows for simple configuration of timers based on sunrise and sunset using timezone information. The door movement is achieved by a DC motor with a string, which pulls the door up. We utilize Tasmota’s Shutters and Blinds   external link 
 feature. The motor is controlled by a simple H-bridge (the…
A brilliant, down to Earth, cookbook for the initial product-discovery and development by Rob Fitzpatrick. 
 
			 The Mom Test: how to talk to customers and learn if your business is a good idea when everybody is lying to you 
		 
 

 Tribal wisdom is not to ask you mother whether your product or business idea is a good one. She will not give you honest…
Sociální opora 
 
 Žil kdysi bohatý Maur. Měl vše, co si mohl přát. Jen jedno mu chybělo. Byl slepý. Nikdo mu nedokázal pomoci. Žil ve svém paláci sám jen s jedním mladým otrokem. Chlapce si oblíbil tak, že s ním jednal, jako s vlastním synem. Jednou mu chlapec řekl: „Pane, rád bych se vrátil na nějaký čas domů. Jsou tam vysoké hory a na nich rostou vzácné a kouzelné rostliny. Možná by vám…
Vizitka a navštívenka jsou ve slovnících uváděny jako synonyma (mají stejný nebo podobný význam). Vizitky a navštívenky zprostředkovávají kontakt, představují někoho. 
 Navštívenka také slouží k předání krátkého vzkazu (např. poděkování, přání k narozeninám či různým výročím, výraz úcty…). 
 Vizitka/navštívenka představuje důležitou formu komunikace v pracovním i společenském styku.…
Written standup is a simple tool that can significantly improve how distributed teams work. It’s just what it sounds like: instead of meeting to talk, team members write down what they’re doing. This has several benefits. It creates a searchable record of what everyone’s working on. It helps people catch up if they miss a day. And it gives you a sense of accomplishment, which can…
Soubory ke stažení a návštěvě 
 
 HTML pro on-line čtení   internal link 
 
 PDF   internal link 
 
 eBook - ePub   internal link 
 
 eBook - mobi   internal link 
 

Summary of “Accelerate: The Science of Lean Software and DevOps” by Nicole Forsgren, Jez Humble, and Gene Kim. The book is about finding (software) engineering practices, that work. Basically confirming all the good biasses about importance of DevOps and lean software development for SaaS products. 
 
			 Accelerate: The Science of Lean Software and DevOps…
Napsala: PhDr. Jaroslava Králová, Doc. PhDr. Helena Kisvetrová, Ph.D. 
 Soubory ke stažení a návštěvě 
 
 HTML pro on-line čtení   internal link 
 
 PDF   internal link 
 
 eBook - ePub   internal link 
 
 eBook - mobi   internal link 
 

I have started using restic   external link 
 backup about 2 years ago. I have learned recently, that some of my colleagues are not aware of its existence or not aware of tight integration with rclone   external link 
 . These two are a powerful combo, allowing for encrypted local and cloud backups with easy.
I need to be committing intro different repositories under different user identities. To Open Source ones with my private email, while using work email for work-related commits/repos. 
 Typically, you would use repo-specific identities. For example (my work repo): 
 git config user.name 'Antonin Kral' 
 git config user.email antonin.kral@workdomain.com
 Now, that is error-prone and…
Kids wanted a working traffic light for one of their games. I took it as a good reason to hide in the workshop and produced one showed on the video below. 
 
 This is super-simple project, why to write a post about it, you may ask? Initial temptation was to grab some small MCU (or even Arduino as that is basically ready to use for such project). But I have opted for old-fashion way without…
Květiny jsou pro člověka velmi důležité. Provázejí ho celý život. Pomocí květin lidé vyjadřují své city, myšlenky, estetiku. Darování květiny či kytice vyjadřuje náklonnost, radost ze setkání, vděk, společenské uznání. Žádná oslava i loučení, náboženské obřady a rituály se bez nich neobejdou.
Od pradávna slouží k obřadům a léčení. 
 Jsou pro nás zdrojem krásy, relaxace, inspirace, věštění,…
Život každé živého tvora je ohraničen narozením a smrtí. Strach ze smrti doprovází lidstvo od té chvíle, co si člověk uvědomil, že je smrtelný. Lidé hledali a stále hledají odpovědi na otázky Je duše nesmrtelná? Co se děje po smrti? Co je to vlastně smrt? 
 Naše představy o smrti nám odhalují náš postoj k životu a k sobě samým. Smrt se nám jeví takovou, jakou si ji sami představujeme. Máme jen…
Pavlínka narazila při stěhování babičky Jany na deník. Tento deník si začal psát 17. prosince roku 1936 mladík jménem Jan Münz. Jan s Janou nějaký čas chodili. Deník pokrývá období od 17.12.1936 do 29.05.1937 (Jan se narodil 17.03.1919). 
 Jan na řádcích svého deníku popisuje každodenní starosti gymnazisty, který stojí před volbou dalšího povolání a oboru studia. Dozvídáme se o běžkařském…
mutt is my preferred client for reading and writing mails. And I do have multiple accounts, some on my private server some on GMail (private as well as business). 
 Initial setup was using my private mail server as single smart host for relaying all outgoing emails. That is sub-optimal as things like DKIM and SPF are basically not working and your GMail emails looks like not legitimate. 
…
Podlehl jsem impulznímu nákupnímu rozhodnutí a pořídil smarwi   external link 
 . Celou akci spustil Petr Stehlík   external link 
 , který postnul link na recenzi produktu serverem Geniální dům   external link 
 . Recenze na serveru genialnidum.cz je pěkně napsaná z uživatelského pohledu. Proto se na produkt zaměřím spíš optikou bastlíře a stůjce několika  …
We have opted for a micro-service paradigm on our back-end. This means that different parts of the API accessible by end-user applications are handled by different services running on our application clusters. This type of distributed system is great for scaling, but it also brings challenges when one needs to troubleshoot a problem or understand dependencies between various services. Two main…
Deník Jana Münze 
 Deník 
 Jan Münz 
 Deník I. 
 Tento sešit byl započat dne 17.XII.1936 a končí dne 
 Jan Münz 
 ''Audax omnia perpeti'' 
 ''Gens humana ruit per vetitum nefas.'' 
 ''Virtus est vitium fugere et sapientia prima stultitia caruisse.'' 
 (Horatius) 
 17.XII.1936. Čtvrtek 
 Vždy jsem myslel, že jest již příliš pozdě na to, abych začal psáti…
This page used to be called “Work Values” in the past, but started to grow beyond values, and actually listing more “how” 1 . Also, unfortunately, word “value” became a bit overloaded and misused 2 by corpo-hr-marketing 3 . 
 I like to build and work at remote-first organizations. That doesn’t necessarily mean being fully remote, on the contrary. The…