Custom input controller about neuroglancer HOT 3 OPEN

I'm not aware of any way to send/receive UDP packets from web client javascript, except for WebRTC which is a particular UDP protocol. I see several options for getting events from the chair into neuroglancer:

1. Create a server (e.g. in Python) that proxies between the chair and neuroglancer by talking to the chair over UDP and to neuroglancer over websockets (which works over TCP).
2. If you are on Linux, create a program that talks to the chair over UDP and creates a regular linux input device via uinput into which it injects key/mouse events that are translated from whatever is sent from the chair. That way neuroglancer will get the events through the browser as regular input events and they can be handled normally. The translation might prove annoying, but maybe it could be made to work, and it might be more efficient than the websockets approach.

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Does Neuroglancer support joystick input? Because I would like to have the chair in parallel with the mouse and keyboard, as a "third hand" so to speak. So I'd need up to 4 additional (unused) axes. If I could somehow access mouse axes beyond x,y, and scrollwheel would be ideal, but I have not encountered any instance of this anywhere yet. However, e.g. the 2 analog sticks of a gamepad would work instead.
I am running Windows now (thanks for the bug fix!). But the chair is actually connected through an mbed LPC 1768 and I have an HID connector through which I can simulate joystick/gamepad output (or standard mouse, or keyboard outputs).
I think using a TCP connection over WebSockets is cleaner from an implementation point of view. But it may not be ideal for compatibility and performance, especially when used over a remote server?

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Neuroglancer doesn't itself have any joystick support, but it looks like the Web Gamepad API already supported by most browsers will do exactly what you need:
https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API/Using_the_Gamepad_API

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