====== adv.additionalWaitBeforeNextWsOpen ======
socket.adv.additionalWaitBeforeNextWsOpen is a number property containing number of seconds to delay before next attempt to open a failed websocket connection.

It needs to be used only for very large installations with tens and hundreds of thousands of users connecting to the same IXNX unit.

===== Value =====
Number of extra seconds to wait before reconnection attempt.

===== Default value =====
0

===== Usage =====
socket.adv.additionalWaitBeforeNextWsOpen can be set by code handling event [[ixnx:wrtc:js:api:wrtc:onevent|wrtc.onEvent(socket, wrtc.event.ws_open_failed, "FAST")]]. Value is reset to zero for each new event.

In extremely large installations you may set this property to a random value to allow reconnects be spread out in time, to avoid overloading the IXNX server.

===== Example =====
  wrtc.onEvent(obj, type, arg) {
    switch(type) {
    ...
    case wrtc.event.ws_open_failed :
        if ((arg === "FAST") && (navigator.onLine))
          obj.adv.additionalWaitBeforeNextWsOpen = Math.floor(10.0 + 30.0 * Math.random());
      break;
    ...
    }
  }