Jekyll2026-01-28T22:33:22+01:00https://wejn.org/feed/by_tag/quickie.xmlWejn.orgWejn's corner on the interwebs, containing articles about computers (Linux), programming, system administration, and whatever else takes my fancy.Michal JirkůSwisscom 2025 security.txt challenge: full writeup2026-01-28T22:25:00+01:002026-01-28T22:33:09+01:00https://wejn.org/2026/01/swisscom-2025-securitytxt-challenge-full-writeupMichal JirkůIn Accidentally solving the Swisscom 2025 security.txt challenge I briefly hinted at the steps that I took to solve the challenge.Visualize those pesky rainbows (interactively)2026-01-14T18:25:00+01:002026-01-14T19:00:34+01:00https://wejn.org/2026/01/visualize-those-pesky-rainbows-interactivelyMichal JirkůIn the previous post (On the unreasonable difficulty of plotting pretty rainbow, fast) I spent many words coming up1 with the Ultimate Rainbow™ for visible light spectra. Well, stealing from Dr. Young, really. ↩Overengineering float serialization for no good reason2025-12-25T17:09:00+01:002025-12-25T19:24:21+01:00https://wejn.org/2025/12/overengineering-float-serialization-for-no-good-reasonMichal JirkůProblem statementDesigning a 3d-printed clasp for a sports gear bag2025-10-31T15:10:00+01:002025-10-31T15:17:34+01:00https://wejn.org/2025/10/3dprinting-a-clasp-for-a-sportsbagMichal JirkůLLM: Write production-ready code!2025-10-25T17:40:00+02:002025-10-25T18:23:58+02:00https://wejn.org/2025/10/llm-write-production-ready-codeMichal JirkůProblem statementAccidentally solving the Swisscom 2025 security.txt challenge2025-09-27T17:27:00+02:002025-09-27T18:59:55+02:00https://wejn.org/2025/09/accidentally-solving-the-swisscom-2025-securitytxt-challengeMichal JirkůFailing to calibrate flame-s-vis-nir-es spectrometer2025-07-31T19:09:00+02:002025-12-25T19:24:21+01:00https://wejn.org/2025/07/failing-to-calibrate-flame-s-vis-nir-esMichal JirkůProblem statementTorch Bearer Spectrometer UI2025-07-05T11:20:00+02:002025-12-25T19:24:21+01:00https://wejn.org/2025/07/torchbearer-spectroscope-uiMichal JirkůProblem statementTesting ESP32’s LEDC “non-blocking” fading2025-03-15T14:09:00+01:002025-03-15T15:08:59+01:00https://wejn.org/2025/03/testing-esp32-ledc-nonblocking-fadingMichal JirkůProblem statementHow-To: timestamp and git-hash version esp32 firmware builds2025-03-02T09:00:00+01:002025-03-02T10:03:26+01:00https://wejn.org/2025/03/howto-timestamp-and-githash-esp32-firmware-buildsMichal JirkůProblem statement