<html>
<head>
<title>Blinker - Po.W.E.R. Synchronization Protocol</title>
</head>
<body>
<h1>Blinker - Po.W.E.R. Synchronization Protocol</h1>
<p>
The Po.W.E.R. synchronization protocol has been defined for a stage
play of BBM (Beobachter der Bediener von Maschinen).
Its purpose is to synchronize multiple media players over a local
network.
</p>
<p>
The master sends/broadcasts the current media file name and the
position within the media file every 0.1s in a single UDP packet.
Both source and destination ports have to be 5740, but Blinker
allows to use other values, too.
</p>
<h2>UDP packet format</h2>
<p>
The payload data in each UDP packet is defined as follows:
<table>
<tr><td><b>start</b></td>
<td width="2em"></td>
<td><b>length</b></td>
<td width="2em"></td>
<td><b>type</b></td>
<td width="2em"></td>
<td><b>description</b></td></tr>
<tr><td>0</td>
<td></td>
<td>4</td>
<td></td>
<td>ASCII</td>
<td></td>
<td>fixed magic, always "PoSy"</td></tr>
<tr><td>4</td>
<td></td>
<td>4</td>
<td></td>
<td>uint32, big endian</td>
<td></td>
<td>bit field for flags</td></tr>
<tr><td>4</td>
<td></td>
<td>64</td>
<td></td>
<td>UTF-8 string, zero-padded</td>
<td></td>
<td>name of the current media piece/file</td></tr>
<tr><td>72</td>
