public function onHeartbeat()
{
if (isset($this->heartbeat_timer)) {
$this->heartbeat_timer->cancel();
}
$this->client->getLoop()->addTimer($this->client->getHeartbeatInterval(), function () {
//Set a new timeout (2 sec seems reasonable)
$this->heartbeat_timer = $this->client->getLoop()->addTimer(2, function () {
$this->stream->close();
throw new ConnectionLostException();
});
$this->sendHeartbeat();
});
}
