diff --git a/.gitignore b/.gitignore
index 13cd459..1f1701e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,5 @@
 out
 gen
 
-composer.lock
 vendor
 
diff --git a/app/Socket/TcpSocket.php b/app/Socket/TcpSocket.php
index cf2f229..e989879 100644
--- a/app/Socket/TcpSocket.php
+++ b/app/Socket/TcpSocket.php
@@ -84,6 +84,12 @@ class TcpSocket {
      */
     const DEFAULT_DEBUG             = false;
 
+    /**
+     * max length for JSON data string
+     * -> throw OverflowException on exceed
+     */
+    const JSON_DECODE_MAX_LENGTH    = 65536 * 4;
+
     /**
      * global server loop
      * @var EventLoop\LoopInterface
@@ -218,7 +224,7 @@ class TcpSocket {
             if('json' == $this->acceptType){
                 // new empty stream for processing JSON
                 $stream = new Stream\ThroughStream();
-                $streamDecoded = new NDJson\Decoder($stream, true);
+                $streamDecoded = new NDJson\Decoder($stream, true, 512, 0, self::JSON_DECODE_MAX_LENGTH);
 
                 // promise get resolved on first emit('data')
                 $promise = Promise\Stream\first($streamDecoded);
@@ -388,7 +394,7 @@ class TcpSocket {
             $this->hasConnection($connection) &&
             ($data = (array)$this->connections->offsetGet($connection)) &&
             isset($data['timers']) && isset($data['timers'][$timerName]) &&
-            ($data['timers'][$timerName] instanceof EventLoop\Timer\TimerInterface)
+            ($data['timers'][$timerName] instanceof EventLoop\TimerInterface)
         ){
             $this->loop->cancelTimer($data['timers'][$timerName]);
 
@@ -535,11 +541,16 @@ class TcpSocket {
      */
     protected function debug(Socket\ConnectionInterface $connection, string $method, string $message = ''){
         if(self::DEFAULT_DEBUG){
+            $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
+            $caller = array_shift($backtrace);
+            $callerOrig = array_shift($backtrace);
+
             $data = [
                 date('Y-m-d H:i:s'),
-                __CLASS__ . '()',
+                'DEBUG',
                 $connection->getRemoteAddress(),
-                $method . '()',
+                $caller['file'] . ' line ' . $caller['line'],
+                $callerOrig['function'] . '()' . (($callerOrig['function'] !== $method) ? ' [' . $method . '()]' : ''),
                 $message
             ];
 
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..5816412
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,938 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "4644a460504bed39266426d4f32f8b79",
+    "packages": [
+        {
+            "name": "cboden/ratchet",
+            "version": "v0.4.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ratchetphp/Ratchet.git",
+                "reference": "0d31f3a8ad4795fd48397712709e55cd07f51360"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ratchetphp/Ratchet/zipball/0d31f3a8ad4795fd48397712709e55cd07f51360",
+                "reference": "0d31f3a8ad4795fd48397712709e55cd07f51360",
+                "shasum": ""
+            },
+            "require": {
+                "guzzlehttp/psr7": "^1.0",
+                "php": ">=5.4.2",
+                "ratchet/rfc6455": "^0.2",
+                "react/socket": "^1.0 || ^0.8 || ^0.7 || ^0.6 || ^0.5",
+                "symfony/http-foundation": "^2.6|^3.0|^4.0",
+                "symfony/routing": "^2.6|^3.0|^4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.8"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Ratchet\\": "src/Ratchet"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Chris Boden",
+                    "email": "cboden@gmail.com",
+                    "role": "Developer"
+                }
+            ],
+            "description": "PHP WebSocket library",
+            "homepage": "http://socketo.me",
+            "keywords": [
+                "Ratchet",
+                "WebSockets",
+                "server",
+                "sockets",
+                "websocket"
+            ],
+            "time": "2017-12-12T00:49:31+00:00"
+        },
+        {
+            "name": "clue/ndjson-react",
+            "version": "v1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/clue/reactphp-ndjson.git",
+                "reference": "c41a30e7f888dc0e4af18881b2c9ab260ba8d6ce"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/clue/reactphp-ndjson/zipball/c41a30e7f888dc0e4af18881b2c9ab260ba8d6ce",
+                "reference": "c41a30e7f888dc0e4af18881b2c9ab260ba8d6ce",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3",
+                "react/stream": "^1.0 || ^0.7 || ^0.6"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0 || ^5.7 || ^4.8.35",
+                "react/event-loop": "^1.0 || ^0.5 || ^0.4 || ^0.3"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Clue\\React\\NDJson\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Christian Lück",
+                    "email": "christian@lueck.tv"
+                }
+            ],
+            "description": "Streaming newline-delimited JSON (NDJSON) parser and encoder for ReactPHP.",
+            "homepage": "https://github.com/clue/reactphp-ndjson",
+            "keywords": [
+                "NDJSON",
+                "json",
+                "jsonlines",
+                "newline",
+                "reactphp",
+                "streaming"
+            ],
+            "time": "2018-05-17T15:31:04+00:00"
+        },
+        {
+            "name": "evenement/evenement",
+            "version": "v3.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/igorw/evenement.git",
+                "reference": "531bfb9d15f8aa57454f5f0285b18bec903b8fb7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/igorw/evenement/zipball/531bfb9d15f8aa57454f5f0285b18bec903b8fb7",
+                "reference": "531bfb9d15f8aa57454f5f0285b18bec903b8fb7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "Evenement": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Igor Wiedler",
+                    "email": "igor@wiedler.ch"
+                }
+            ],
+            "description": "Événement is a very simple event dispatching library for PHP",
+            "keywords": [
+                "event-dispatcher",
+                "event-emitter"
+            ],
+            "time": "2017-07-23T21:35:13+00:00"
+        },
+        {
+            "name": "guzzlehttp/psr7",
+            "version": "1.5.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/guzzle/psr7.git",
+                "reference": "9f83dded91781a01c63574e387eaa769be769115"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/9f83dded91781a01c63574e387eaa769be769115",
+                "reference": "9f83dded91781a01c63574e387eaa769be769115",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0",
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5"
+            },
+            "provide": {
+                "psr/http-message-implementation": "1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.5-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "GuzzleHttp\\Psr7\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Michael Dowling",
+                    "email": "mtdowling@gmail.com",
+                    "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
+                }
+            ],
+            "description": "PSR-7 message implementation that also provides common utility methods",
+            "keywords": [
+                "http",
+                "message",
+                "psr-7",
+                "request",
+                "response",
+                "stream",
+                "uri",
+                "url"
+            ],
+            "time": "2018-12-04T20:46:45+00:00"
+        },
+        {
+            "name": "psr/http-message",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/http-message.git",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Http\\Message\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "http://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for HTTP messages",
+            "homepage": "https://github.com/php-fig/http-message",
+            "keywords": [
+                "http",
+                "http-message",
+                "psr",
+                "psr-7",
+                "request",
+                "response"
+            ],
+            "time": "2016-08-06T14:39:51+00:00"
+        },
+        {
+            "name": "ralouphie/getallheaders",
+            "version": "2.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ralouphie/getallheaders.git",
+                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
+                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~3.7.0",
+                "satooshi/php-coveralls": ">=1.0"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/getallheaders.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Ralph Khattar",
+                    "email": "ralph.khattar@gmail.com"
+                }
+            ],
+            "description": "A polyfill for getallheaders.",
+            "time": "2016-02-11T07:05:27+00:00"
+        },
+        {
+            "name": "ratchet/rfc6455",
+            "version": "0.2.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ratchetphp/RFC6455.git",
+                "reference": "1612f528c3496ad06e910d0f8b6f16ab97696706"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ratchetphp/RFC6455/zipball/1612f528c3496ad06e910d0f8b6f16ab97696706",
+                "reference": "1612f528c3496ad06e910d0f8b6f16ab97696706",
+                "shasum": ""
+            },
+            "require": {
+                "guzzlehttp/psr7": "^1.0",
+                "php": ">=5.4.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "4.8.*",
+                "react/http": "^0.4.1",
+                "react/socket-client": "^0.4.3"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Ratchet\\RFC6455\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Chris Boden",
+                    "email": "cboden@gmail.com",
+                    "role": "Developer"
+                }
+            ],
+            "description": "RFC6455 WebSocket protocol handler",
+            "homepage": "http://socketo.me",
+            "keywords": [
+                "WebSockets",
+                "rfc6455",
+                "websocket"
+            ],
+            "time": "2018-05-02T14:52:00+00:00"
+        },
+        {
+            "name": "react/cache",
+            "version": "v0.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/reactphp/cache.git",
+                "reference": "7d7da7fb7574d471904ba357b39bbf110ccdbf66"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/reactphp/cache/zipball/7d7da7fb7574d471904ba357b39bbf110ccdbf66",
+                "reference": "7d7da7fb7574d471904ba357b39bbf110ccdbf66",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0",
+                "react/promise": "~2.0|~1.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.4 || ^5.7 || ^4.8.35"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "React\\Cache\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Async, Promise-based cache interface for ReactPHP",
+            "keywords": [
+                "cache",
+                "caching",
+                "promise",
+                "reactphp"
+            ],
+            "time": "2018-06-25T12:52:40+00:00"
+        },
+        {
+            "name": "react/dns",
+            "version": "v0.4.16",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/reactphp/dns.git",
+                "reference": "0a0bedfec72b38406413c6ea01e1c015bd0bf72b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/reactphp/dns/zipball/0a0bedfec72b38406413c6ea01e1c015bd0bf72b",
+                "reference": "0a0bedfec72b38406413c6ea01e1c015bd0bf72b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0",
+                "react/cache": "^0.5 || ^0.4 || ^0.3",
+                "react/event-loop": "^1.0 || ^0.5 || ^0.4 || ^0.3.5",
+                "react/promise": "^2.1 || ^1.2.1",
+                "react/promise-timer": "^1.2",
+                "react/stream": "^1.0 || ^0.7 || ^0.6 || ^0.5 || ^0.4.5"
+            },
+            "require-dev": {
+                "clue/block-react": "^1.2",
+                "phpunit/phpunit": "^6.4 || ^5.7 || ^4.8.35"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "React\\Dns\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Async DNS resolver for ReactPHP",
+            "keywords": [
+                "async",
+                "dns",
+                "dns-resolver",
+                "reactphp"
+            ],
+            "time": "2018-11-11T11:21:13+00:00"
+        },
+        {
+            "name": "react/event-loop",
+            "version": "v1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/reactphp/event-loop.git",
+                "reference": "a0ecac955c67b57c40fe4a1b88a7cca1b58c982d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/reactphp/event-loop/zipball/a0ecac955c67b57c40fe4a1b88a7cca1b58c982d",
+                "reference": "a0ecac955c67b57c40fe4a1b88a7cca1b58c982d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^7.0 || ^6.4 || ^5.7 || ^4.8.35"
+            },
+            "suggest": {
+                "ext-event": "~1.0 for ExtEventLoop",
+                "ext-pcntl": "For signal handling support when using the StreamSelectLoop",
+                "ext-uv": "* for ExtUvLoop"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "React\\EventLoop\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "ReactPHP's core reactor event loop that libraries can use for evented I/O.",
+            "keywords": [
+                "asynchronous",
+                "event-loop"
+            ],
+            "time": "2019-02-07T16:19:49+00:00"
+        },
+        {
+            "name": "react/promise",
+            "version": "v2.7.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/reactphp/promise.git",
+                "reference": "31ffa96f8d2ed0341a57848cbb84d88b89dd664d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/reactphp/promise/zipball/31ffa96f8d2ed0341a57848cbb84d88b89dd664d",
+                "reference": "31ffa96f8d2ed0341a57848cbb84d88b89dd664d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.8"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "React\\Promise\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
+            "authors": [
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+                    "name": "Jan Sorgalla",
+                    "email": "jsorgalla@gmail.com"
+                }
+            ],
+            "description": "A lightweight implementation of CommonJS Promises/A for PHP",
+            "keywords": [
+                "promise",
+                "promises"
+            ],
+            "time": "2019-01-07T21:25:54+00:00"
+        },
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+            "name": "react/promise-stream",
+            "version": "v1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/reactphp/promise-stream.git",
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+            "dist": {
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+                "url": "https://api.github.com/repos/reactphp/promise-stream/zipball/00e269d611e9c9a29356aef64c07f7e513e73dc9",
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3",
+                "react/promise": "^2.1 || ^1.2",
+                "react/stream": "^1.0 || ^0.7 || ^0.6 || ^0.5 || ^0.4 || ^0.3"
+            },
+            "require-dev": {
+                "clue/block-react": "^1.0",
+                "phpunit/phpunit": "^6.4 || ^5.7 || ^4.8.35",
+                "react/event-loop": "^1.0 || ^0.5 || ^0.4 || ^0.3",
+                "react/promise-timer": "^1.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "React\\Promise\\Stream\\": "src/"
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Christian Lück",
+                    "email": "christian@lueck.tv"
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