There are two separate things here:
1) ADB → BlueStacks is only for installing/debugging the Android app.
In BlueStacks: Settings → Advanced → enable “Android Debug Bridge” → Save changes. Then on your PC:
adb kill-server
adb start-server
adb connect 127.0.0.1:5555
adb devices
BlueStacks documents the ADB toggle under Settings → Advanced, and Android’s adb docs use 5555 as the first emulator adb port. (support.bluestacks.com)
2) OpenClaw Android node → OpenClaw Gateway does not use adb connect.
Once the Android app is running, connect it from the app’s Connect tab using a setup code: