Debugging notes on video pipelines, embedded devices, database failures, and the tools that got me out of them.https://xzan.my.id/en-ushttps://xzan.my.id/writing/realtek-8822ce-stuck-wifi-4-rtk-killer/https://xzan.my.id/writing/realtek-8822ce-stuck-wifi-4-rtk-killer/A WiFi 5 chip was quietly running at WiFi 4 speeds on a 20 MHz channel, capping a whole mini PC at 10 Mbps. The stock drivers could not fix it. A community-built driver could.Mon, 13 Jul 2026 00:00:00 GMThttps://xzan.my.id/writing/esp32-auth-expired-cold-boot-wifi/https://xzan.my.id/writing/esp32-auth-expired-cold-boot-wifi/A tiny Bluetooth proxy that worked fine for weeks kept hanging after every power cut. The fix was physical, the root cause was a reconnect race, and I was wrong twice before I listened to the one clue I kept ignoring.Sun, 14 Jun 2026 00:00:00 GMThttps://xzan.my.id/writing/use-opencode-from-anywhere-via-telegram/https://xzan.my.id/writing/use-opencode-from-anywhere-via-telegram/Bridge your local OpenCode instance to Telegram so you can code from anywhere, no tunnels, no open ports, and nothing on the internet.Sun, 31 May 2026 00:00:00 GMThttps://xzan.my.id/writing/mysql-replication-disaster-recovery/https://xzan.my.id/writing/mysql-replication-disaster-recovery/Turning a single-server Node.js app into a resilient setup with master-slave replication, Docker, and a one-command failback script, without touching the existing production stack.Wed, 20 May 2026 00:00:00 GMThttps://xzan.my.id/writing/stop-shipping-api-keys-ios-proxy/https://xzan.my.id/writing/stop-shipping-api-keys-ios-proxy/Why compiling OpenAI or Gemini keys inside your mobile app binary is a security trap, and how to build an elegant serverless proxy using Cloudflare Workers for free.Fri, 20 Mar 2026 00:00:00 GMThttps://xzan.my.id/writing/debugging-nswindow-crash/https://xzan.my.id/writing/debugging-nswindow-crash/A deep dive into debugging a mysterious crash in a macOS menu bar app built with Swift 6 and AppKit.Fri, 23 Jan 2026 00:00:00 GMThttps://xzan.my.id/writing/telegram-bot-problem/https://xzan.my.id/writing/telegram-bot-problem/When your Telegram bot works flawlessly in DMs but ignores every message in a group, including @mentions, the fix is rarely where you expect it.Tue, 13 Jan 2026 00:00:00 GMThttps://xzan.my.id/writing/programmers-vs-vibe-coders/https://xzan.my.id/writing/programmers-vs-vibe-coders/Exploring the democratization of coding tools, the rise of vibe coding, and why the debate between engineering depth and business speed is a familiar historical pattern.Thu, 25 Dec 2025 00:00:00 GMThttps://xzan.my.id/writing/cursor-centered-zoom-math/https://xzan.my.id/writing/cursor-centered-zoom-math/Why my first zoom implementation was wrong, and the formula that finally made cursor-centered zoom work correctly at any zoom level.Tue, 07 Oct 2025 00:00:00 GMThttps://xzan.my.id/writing/building-cctv-rtsp-live-macos/https://xzan.my.id/writing/building-cctv-rtsp-live-macos/The story of building a macOS app for RTSP camera monitoring from scratch - what started as a personal itch turned into a full-featured indie app.Tue, 19 Aug 2025 00:00:00 GMThttps://xzan.my.id/writing/building-recording-engine-ffmpeg-macos/https://xzan.my.id/writing/building-recording-engine-ffmpeg-macos/Why VLCKit's built-in recording failed for RTSP live streams, and how I replaced it with an FFmpeg subprocess that actually works.Mon, 02 Jun 2025 00:00:00 GMThttps://xzan.my.id/writing/fixing-h265-freeze-tuya-cameras/https://xzan.my.id/writing/fixing-h265-freeze-tuya-cameras/How I tracked down a VideoToolbox -12906 error causing RTSP stream freezes and reconnect loops in my macOS CCTV app.Fri, 14 Mar 2025 00:00:00 GMThttps://xzan.my.id/writing/engineering-stability/https://xzan.my.id/writing/engineering-stability/A reflection on 17 years of building software - from Friendster layouts to production systems - and what I've learned about writing code that actually holds up.Mon, 30 Dec 2024 00:00:00 GMThttps://xzan.my.id/writing/finding-tuya-dp-ids/https://xzan.my.id/writing/finding-tuya-dp-ids/Step-by-step guide to finding Tuya DP IDs using the IoT Cloud API Explorer. Includes DP ID reference tables for smart plugs, bulbs, IP cameras, and IR blasters - useful for LocalTuya and Home Assistant integrations.Tue, 03 Sep 2024 00:00:00 GMThttps://xzan.my.id/writing/indihome-loyalty-tax/https://xzan.my.id/writing/indihome-loyalty-tax/A seven-year price history of my Indihome fiber plan, from 10 Mbps to 200 Mbps, and why staying loyal to an ISP silently costs you more than pushing back.Tue, 22 Aug 2023 00:00:00 GMT