n4u
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game_svg_erl_demo


			
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<h1><a name="chapter2">N2O Protocol</a></h1>

<h2><a name="p1.1">JSON container</a></h2>


<p>Each message from Web Socket channel to Client encoded as JSON object.
<a href="https://github.com/synrc/n2o_scripts/blob/master/n2o/n2o.js">N2O.js</a>
is used to decode WebSocket binary messages from JSON container.</p>

<code>{ "eval": "ws.send("Send Back This String");",
  "data": [131,104,2,100,0,7,109,101,115,115,
           97,103,101,107,0,5,72,101,108,108,111] }
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<p>EVAL values evaluated immediately and DATA values passed
to handle_web_socket(data) function if exists.</p>

<code>function handle_web_socket(body) { console.log(body); } </code>

<h2><a name="p1.1">BERT messages</a></h2>

<p>Usually in DATA come <a href="http://bert-rpc.org">BERT</a> messages (Binary Erlang Term Format).
<a href="https://github.com/synrc/n2o_scripts/blob/master/n2o/bert.js">BERT.js</a>
is used to decode Game Protocol message.</p>

<code>function handle_web_socket(body) {
    console.log(String(bert.decodebuf(body))); } </code>

<code style="background-color:white;">E> Received: {message,"Hello"} </code>

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