Jekyll2026-04-01T19:00:10+02:00https://wejn.org/feed/by_tag/reversing.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.Accidentally 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 statementPhilips Hue White Ambiance is actually terrible…2025-07-17T15:53:00+02:002025-12-25T19:24:21+01:00https://wejn.org/2025/07/philips-hue-white-ambiance-is-actually-terribleMichal JirkůIntroductionTorch Bearer Spectrometer UI2025-07-05T11:20:00+02:002025-12-25T19:24:21+01:00https://wejn.org/2025/07/torchbearer-spectroscope-uiMichal JirkůProblem statementFinal stretch for e32wamb: PCB, cables, antenna holder2025-05-11T17:35:00+02:002025-05-11T20:03:18+02:00https://wejn.org/2025/05/finishing-stretch-for-e32wamb-pcb-cables-antenna-holderMichal JirkůSpoiler: one of the e32wamb alive.Introducing e32wamb: firmware for esp32-c6 based White Ambiance light2025-03-24T14:48:00+01:002025-03-25T18:56:40+01:00https://wejn.org/2025/03/introducing-e32wamb-firmware-for-esp32-c6-based-white-ambianceMichal Jirkůstar of today’s show: proto-light running e32wambZigbee: Hue-llo world!2025-01-05T14:35:00+01:002025-01-05T17:25:11+01:00https://wejn.org/2025/01/zigbee-hue-llo-worldMichal Jirkůstars of today’s show: Zigbee enabled modulesHue Engine: Reversing the PWM functions2024-12-17T16:15:00+01:002024-12-17T21:19:12+01:00https://wejn.org/2024/12/hue-engine-reversing-the-functionsMichal JirkůIntroductionHue Engine: Dumping the PWM data2024-12-15T21:30:00+01:002024-12-17T21:19:12+01:00https://wejn.org/2024/12/hue-engine-dumping-the-dataMichal JirkůIntroduction