WebTorrent Configure Custom STUN / TURN Server

webtorrent_demo.js

var client = window.client = new WebTorrent({
  tracker: {
    rtcConfig: rtcConfig
  }
})
client.on('warning', onWarning)
client.on('error', onError)

torrent = client.add(TORRENT, onTorrent)

rtcConfig =

{
    "iceServers": [{
        "urls": "stun:23.21.150.121"
    }, {
        "username": "xxx",
        "credential": "xxx",
        "urls": "turn:global.turn.twilio.com:3478?transport=udp"
    }, {
        "username": "xxx",
        "credential": "xxx",
        "urls": "turn:global.turn.twilio.com:3478?transport=tcp"
    }, {
        "username": "xxxx",
        "credential": "xxx",
        "urls": "turn:global.turn.twilio.com:443?transport=tcp"
    }]
}