ping.js

  sendPings() {
    this.pingInterval = setInterval(() => {
      this.pings[this.pingNumber] = Date.now();
      this.pingRecord.set(`player-${this.isHost ? 1 : 2}-ping-${this.pingNumber}`, {
        index: this.pingNumber,
        ping: true,
      });
      this.pingNumber += 1;
      if (this.pingNumber >= 20) {
        clearInterval(this.pingInterval);
      }
    }, 1000);
  }

  receivedPong(data) {
    const rtt = Date.now() - this.pings[data.index];
    this.roundTripTimes.push(rtt);
    this.roundTripTimes.sort((a, b) => a - b);
    // get median of all received roundtrips, divide by 2 to get the one-way-latency
    this.latency = this.roundTripTimes[Math.floor(this.roundTripTimes.length / 2)] / 2;
  }