LAN mode is an alternate method of connecting the robot controller and the driver station. It connects through a router over WiFi instead of over Wifi Direct, which lets you connect to the robot simply by joining the phones to the same wifi network and typing in the IP address of the controller on the DS. In my experience, it connects far more quickly and robustly then the wifi direct version, and hardly ever requires anything to be rebooted or restarted (yay!). Since it uses a regular wifi network, you can use Android's network debugging with ease, and even (double yay!) download and run a robot controller program without you ever having to touch the robot controller phone.
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