XIAO ESP32S3 camera web apps — STA (router) mode

The board joins the user's WiFi router. The PC/phone stays on its normal network (internet keeps working) and reaches the board at http://<mdns-name>.local or its DHCP IP.

Read the xiao-esp32s3 skill (same repo) first for base workflow and pitfalls (especially: PSRAM flag mandatory, DTR reset-stuck recovery, no serial reads while a demo must keep running).