Rainng Android Captive Portal Service

For Android 5.x-6.x
Run adb command

adb shell "settings put global captive_portal_server captive.rainng.com"

For Android 7.x-11.x
Run adb command

adb shell "settings put global captive_portal_http_url http://captive.rainng.com/generate_204"
adb shell "settings put global captive_portal_https_url https://captive.rainng.com/generate_204"