Method schedulePing

packages/engine.io/lib/socket.ts:212–221

* Pings client every `this.pingInterval` and expects response * within `this.pingTimeout` or closes connection. * * @private

()

   * @private
   */
  private schedulePing() {
    this.pingIntervalTimer = setTimeout(() => {
      debug(
        "writing ping packet - expecting pong within %sms",
        this.server.opts.pingTimeout,
      );
      this.sendPacket("ping");
      this.resetPingTimeout();
    }, this.server.opts.pingInterval);
  }

  /**
   * Resets ping timeout.