Автозагрузка.

\var\log\phpdarmon.log

[Thu, 19 Nov 2015 07:12:06.980016 +0300] M#43582 \PHPDaemon\Core\Pool:Servers\WebSocket up.
[Thu, 19 Nov 2015 07:12:06.994425 +0300] M#43582 \PHPDaemon\Core\Pool:\PHPDaemon\Servers\WebSocket\Pool up.
[Thu, 19 Nov 2015 07:12:07.015732 +0300] W#43584 \MyWebSocket up.
[Thu, 19 Nov 2015 07:12:08.216939 +0300] Spawning 1 worker(s)
[Thu, 19 Nov 2015 07:12:08.533961 +0300] W#43586 \MyWebSocket up.
[Thu, 19 Nov 2015 07:12:12.417157 +0300] W#43584 crashed by error 'Class 'Test' not found' at /var/www/rijen/1a/server/MyWebSocket.php:78
[Thu, 19 Nov 2015 07:12:12.437178 +0300] Spawning 1 worker(s)
[Thu, 19 Nov 2015 07:12:12.753582 +0300] W#43589 \MyWebSocket up.

\var\www\rijen\1a\server\composer.json

{
	"name": "rijen",
	"autoload": {
		"psr-4": {
			"App\\": "src/"
		}
	}
}

\var\www\rijen\1a\server\MyWebSocket.php

<?php

require_once './vendor/autoload.php';

use \App;

class MyWebSocket extends \PHPDaemon\Core\AppInstance
{

	public function onReady()
	{
		$appInstance = $this;
		// Метод timerTask() будет вызываться каждые 5 секунд
		//	$this->timerTask($appInstance);
		// Наше приложение будет доступно по адресу ws://site.com:8047/myws
		\PHPDaemon\Servers\WebSocket\Pool::getInstance()->addRoute('myws', function ($client) use ($appInstance)
		{
			$session						 = new MyWebSocketRoute($client, $appInstance); // Создаем сессию
			$session->id					 = uniqid(); // Назначаем ей уникальный ID
			$this->sessions[$session->id]	 = $session; //Сохраняем в массив

			return $session;
		});
	}

	//some code
}

class MyWebSocketRoute extends \PHPDaemon\WebSocket\Route
{

	//some code
	public function onFrame($data, $type)
	{
		$this->client->sendFrame(Test::test(), 'STRING');
	}

}

\var\www\rijen\1a\server\src\Test.php

<?php

namespace App;

Class Test
{

	static function test()
	{
		return 123;
	}

}

You need use \App\Test; not use \App;