JSON data has less information in websocket communication in v4 SDK than v3

[blackmikan]

Hi, I have a question about JSON data by leap controller in websocket communication.

In v3 SDK, I can get much information about tracking data by the controller in websocket communication:
https://developer-archive.leapmotion.com/documentation/javascript/supplements/Leap_JSON.html

In v4 SDK, I can get tracking data too, but the form of JSON data has changed and has less information.
I want to get gesture data, and is there another way to get information about it? Or if I can't get gesture information directly, I need to write codes to recognize gestures from tracking data provided in v4 SDK websocket communication, and is there any similar code to do it?

Thank you.

[AlexColgan]

Gestures were formally removed in the V4 SDK; technically they were deprecated with version 3, but remained in the code base. There are a number of different libraries available that make it possible to either hard-code a gesture or train a neural network, but they're rather old.