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<TITLE>The Ivy C library guide: Conventions for writing applications</TITLE>
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<H2><A NAME="s6">6. Conventions for writing applications</A></H2>
<H3>6.1 Default bus</H3>
By default, the bus used is <em><strong>127.255.255.255:2010 </em></strong> ie the application will be connected on the port 2010 of the local machine it runs on.</p>
<P>You can set the bus to be used by setting the environment variable <CODE>IVYBUS</CODE> or by implementing the option <CODE>-b</CODE> in the application.</P>
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<H3>6.2 Syntax of messages</h3>
The syntax of the messages exchanged is totally free. However, the following convention is recommended:
<menu>
<li>The message syntax is <CODE>Subject Attributes</CODE></li>
<li>A Subject is an object, named in a hierarchical form: <CODE>ObjectClass1:object1.ObjectClass2:object2...</CODE></li>
<li>Attributes are pairs <CODE>(attribute-name, value)</CODE></li>
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Example:
<p><CODE>AIRCRAFT:LIB720 Moved lat=46.1697 lon=2.0844 vx=-36 vy=-463 afl=330 rate=0 heading=184 ground_speed=465
mach_speed=0 tendance=0 time=24600 cfl=330</CODE>
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