duncan3dc\Sonos\Network::getSpeakers PHP Method

    public function getSpeakers()
    {
        if (is_array($this->speakers)) {
            return $this->speakers;
        }
        $this->logger->info("creating speaker instances");
        $cacheKey = $this->getCacheKey();
        if ($this->cache->contains($cacheKey)) {
            $this->logger->info("getting device info from cache");
            $devices = $this->cache->fetch($cacheKey);
        } else {
            $devices = $this->getDevices();
            # Only cache the devices if we actually found some
            if (count($devices) > 0) {
                $this->cache->save($cacheKey, $devices);
            }
        }
        if (count($devices) < 1) {
            throw new \RuntimeException("No devices found on the current network");
        }
        # Get the topology information from 1 speaker
        $topology = [];
        $ip = reset($devices);
        $uri = "http://{$ip}:1400/status/topology";
        $this->logger->notice("Getting topology info from: {$uri}");
        $xml = (string) (new Client())->get($uri)->getBody();
        $players = (new XmlParser($xml))->getTag("ZonePlayers")->getTags("ZonePlayer");
        foreach ($players as $player) {
            $attributes = $player->getAttributes();
            $ip = parse_url($attributes["location"])["host"];
            $topology[$ip] = $attributes;
        }
        $this->speakers = [];
        foreach ($devices as $ip) {
            $device = new Device($ip, $this->cache, $this->logger);
            if (!$device->isSpeaker()) {
                continue;
            }
            $speaker = new Speaker($device);
            if (!isset($topology[$ip])) {
                throw new \RuntimeException("Failed to lookup the topology info for this speaker");
            }
            $speaker->setTopology($topology[$ip]);
            $this->speakers[$ip] = $speaker;
        }
        return $this->speakers;
    }

 /**
  * Get the speaker of the alarm.
  *
  * @return Speaker
  */
 public function getSpeaker()
 {
     foreach ($this->network->getSpeakers() as $speaker) {
         if ($speaker->getUuid() === $this->getRoom()) {
             return $speaker;
         }
     }
     throw new \RuntimeException("Unable to find a speaker for this alarm");
 }