2004-02-10 15:35:48 +00:00
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<title>FlightGear: Remote control</title>
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<meta name="Author" content="Melchior FRANZ">
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<meta name="KeyWords" content="flightgear,fgfs,flightsimulator,simulator,remote,control,perl,c,c++">
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<link rel="StyleSheet" type="text/css" href="fgfs.css">
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<link rel="SHORTCUT ICON" href="mf.ico">
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</head>
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<body>
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<h1>FlightGear: Remote control</h1>
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<p>FlightGear has several interfaces that provide access to internal
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parameters. The HTTP interface is best suited for human interaction
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via a web browser. The telnet interface is the ideal choice for
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remotely controlling FlightGear by means of external programs.
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</p>
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<p>To activate FlightGear's telnet server capabilities, call it with
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2007-02-19 16:18:57 +00:00
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a <em>--telnet</em> specifiaction:
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2004-02-10 15:35:48 +00:00
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<blockquote>
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<pre>
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2007-02-19 16:18:57 +00:00
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$ fgfs --telnet=socket,bi,5,localhost,5501,tcp
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2004-02-10 15:35:48 +00:00
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</pre>
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<br>
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<br>
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<table>
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<tr><td><strong>socket:</strong></td><td>FlightGear protocol</td></tr>
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<tr><td><strong>bi:</strong></td><td>bidirectional</td></tr>
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<tr><td><strong>5:</strong></td><td>polling frequency in Hertz</td></tr>
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<tr><td><strong>localhost: </strong></td><td>server name or IP-address</td></tr>
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<tr><td><strong>5501: </strong></td><td>server port</td></tr>
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<tr><td><strong>tcp:</strong></td><td>internet protocol type</td></tr>
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</table>
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</blockquote>
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<br>
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<br>
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In newer versions of FlightGear just type:
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<blockquote>
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<pre>
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$ fgfs --telnet=5501
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</pre>
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</blockquote>
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</p>
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<p>To learn more about the supported commands, connect to FlightGear
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with a telnet program and type in "help<RETURN>". This is what you'll get:<p>
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<blockquote>
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<pre>
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$ telnet localhost 5501
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Trying ::1...
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Trying 127.0.0.1...
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Connected to localhost.
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Escape character is '^]'.
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help
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Valid commands are:
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help show help message
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ls [<dir>] list directory
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dump dump current state (in xml)
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cd <dir> cd to a directory, '..' to move back
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pwd display your current path
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get <var> show the value of a parameter
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show <var> synonym for get
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set <var> <val> set <var> to a new <val>
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data switch to raw data mode
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prompt switch to interactive mode (default)
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quit terminate connection
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/>
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</pre>
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</blockquote>
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<p>Now you can browse in the property system like in a Linux file
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system with <em>cd, ls, pwd</em>.</p>
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<p>Here you can <a href="fgfsscript">download a sample script</a>
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written in Perl, that shows how to access and manipulate FlightGear's
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internal parameters. It can be started before FlightGear (in which
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case it tries up to 2 minutes to connect) or afterwards. Then
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it picks a random AGL altitude and checks every 5 seconds
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if the aircraft has already climbed at this height. Now it starts
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to empty all four tanks, one after the other, until the engines
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stop working. Try to find a place where you can land safely. :-)</p>
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<blockquote>
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<pre>
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$ fgfsscript&
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2007-02-19 16:18:57 +00:00
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$ fgfs --telnet=socket,bi,5,localhost,5501,tcp
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2004-02-10 15:35:48 +00:00
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</pre>
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</blockquote>
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<p>The script defaults to <em>localhost</em> and <em>port 5501</em>,
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but you can let the script control FlightGear on another host and
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under another port.</p>
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<blockquote>
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<pre>
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$ fgfsscript some.host.org 1234&
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</pre>
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</blockquote>
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<p>Demo programs are available in:<br>
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<ul>
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<li><a href="fgfsclient.c">C</a></li>
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<li><a href="fgfsclient.cxx">C++</a></li>
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<li><a href="fgfsscript">Perl (same as mentioned above)</a></li>
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</ul>
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</p>
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</body>
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</html>
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