Nintendo Switch Controller delayed response on Android TV 9

Question

I'm owning a Xiaomi Mi TV 4A that runs Android TV 9. I would like to play games on it with the SNES -aka Super Famicom- Nintendo Switch Bluetooth controller.


Connecting the controller works but there is a big delay after pressing a button and there are random other issues like multiple steps instead of one after pressing the D-Pad in a direction.


Is this an issue with the controller or are there settings I'm missing?


I updated the OS, tried reconnecting the Gamepad and rebooting the TV without success.


— Tom | Sources

Answer

Sadly this is an issue with Nintendo Switch Controllers


While Nintendo Switch Controllers use Bluetooth HID, they aren't completely conforming to the specification which means that you'll need a modified driver (and that is hard on Android).


Bluetooth HID (Human Interface Device) is the spec that allows for bluetooth keyboards, mice, and gamepads to communicate with supporting devices.


So I found this project trying to document the interface to the Nintendo Switch. As can be seen at the end of Issue #7 HID protocol for Bluetooth/USB there has been some success on Linux, but Issue #92 for Android has remained unanswered.


Changing the bluetooth driver is a Custom ROM level change. A compatible Android bluetooth driver would have to be made and support your bluetooth chipset and your platform hardware. As you are running TV hardware, I have doubts that any Custom ROMs exist, and then writing a driver supporting the Bluetooth chipset would be a further obstacle.


Based on:


Nintendo Switch Reverse Engineering HID Notes


Issue #7 - HID Protocol for Bluetooth / USB


Issue #92 - How to communicate with joycon in Android platform?


— Morrison Chang | Sources

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