DroidMote Server is the receiver of DroidMote Client and require Root permissions to work. The Client instead does not require root permissions.
With these Free Servers, you can control Android, Windows, Linux and Chrome OS for free by watching a rewarded video ADS in DroidMote Client. You can remove the video ADS with a single in-app purchase in DroidMote Client.
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The orientation is the rotation from the default position to put the device in landscape. Generally, the orientation for Android TV boxes and large tablets is 0 for phones +90 or -90