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2 articles

• SoftwareHow I turned an old Android phone into a home server (no root, no open ports)A Samsung Galaxy S20+ with a broken screen now hosts this website: Termux, udocker, Next.js, PostgreSQL and a Cloudflare Tunnel, step by step, with the Android pitfalls that cost me the most time.29 October 2026 · 9 min read
• Home energyHeating with surplus solar: an ESP32 between a Huawei inverter and a Vaillant heat pumpHow an ESP32 reads a Huawei SUN2000 over Modbus TCP and steers a Vaillant aroTHERM with a VRC 700 to use surplus solar, safely: registers, wiring, firmware, control rules and the pitfalls.29 October 2026 · 9 min read