Method _schedulePing

javascript/src/peerfetch.ts:339–356

* Schedule periodic pings to keep the datachannel alive. * Some routers and firewalls close open ports within seconds * without data packets flowing through.

()

   * without data packets flowing through.
   */
  _schedulePing () {
    this._keepAlive = setInterval(
      async () => {
        // check if there are any pending requests
        // no ping needed as long as there is traffic on the channel
        if (!this._pendingRequests()) {
          try {
            // request pong to keep the webrtc datachannel connection alive
            await this.get('ping')
          } catch (err) {
            console.warn('ping request timed out while waiting for pong from remote peer.')
          }
        }
      },
      1000 // every second
    )
    console.debug('Pings scheduled.')
  }

  /**
  * Stop keepalive pings.