Here is the snippet for sending intent to open deeplink:
adb shell am start -a android.intent.action.VIEW -c android.intent.category.BROWSABLE -d '{your_protocol}://{your_path_pattern}'
Sample:
adb shell am start -a android.intent.action.VIEW -c android.intent.category.BROWSABLE -d 'demo://demoapp?unlock=PREMIUM&state=1'
