0874292172
The Pixel 8a is attached to .27 at the same time as the headless emulator, so bare adb calls failed with "error: more than one device/emulator". Every device-specific adb call now gets an explicit serial. - Add serial selection: ANDROID_SERIAL when set, else the first emulator-* entry from "adb devices". - Pass -s "$SERIAL" to the adb calls in install, screenshot, status and stop. - wait polls for the emulator serial instead of bare "adb wait-for-device", which fails at once when the Pixel 8a is attached, then waits with -s and accepts an optional timeout. - Fail with a clear message, and not a raw adb error, when no emulator runs; screenshot also fails on an empty capture. - Interface unchanged: start|wait|install <apk>|screenshot [out]|stop|status. Proven on .27 with the Pixel 8a attached (USB and wireless): install -> Success, screenshot -> 1392860 bytes from emulator-5554. The deployed copy at ~/android/emu.sh is byte-identical to this file. Co-Authored-By: Paperclip <noreply@paperclip.ing>