Thank you very much everyone! I've been reading all your advice, I made this
program that sends data to FlightGear and my protocol.
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
/// CLIENT
int main(int argc, char *argv[])
{
printf("This is the client program\n");
int sockfd;
char data[1000];
int len, heading;
struct sockaddr_in address;
int result;
int rc = 1;
//Create socket for client.
sockfd = socket(PF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
perror("Socket create failed.\n") ;
return -1 ;
}
//Name the socket as agreed with server.
address.sin_family = AF_INET;
address.sin_addr.s_addr = inet_addr("127.0.0.1");
address.sin_port = htons(7734);
len = sizeof(address);
result = connect(sockfd, (struct sockaddr *)&address, len);
if(result == -1){
perror("Error has occurred");
exit(-1);
}
heading=0;
printf("%d ",heading);
while (heading < 360 && rc !=-1) {
heading += 20;
sprintf(data,"%d\n",heading);
usleep(100000);
//Read and write via sockfd
rc = write(sockfd,data, strlen(data));
printf("%s",data);
}
close(sockfd);
exit(0);
}
<?xml version="1.0"?>
<PropertyList>
<generic>
<input>
<line_separator>tab</line_separator>
<chunk>
<name>heading bug</name>
<type>int</type>
<node>/autopilot/settings/heading-bug-deg</node>
<relative>false</relative>
<min>1</min>
<max>360</max>
<wrap>true</wrap>
</chunk>
</input>
</generic>
</PropertyList>
:)
2012/6/25 Geoff McLane <ubu...@geoffair.info>
> Hi Sanny,
>
> If you want to communicate via sockets,
> and 'get' or 'set' properties then this is the
> page -
>
> http://wiki.flightgear.org/Telnet_usage
>
> But to expand that a little
>
> 1. server - Need to run fgfs with a command -
>
> --telnet=<port>
>
> This connects fgfs to localhost:port, but the read/write
> is only POLLED a few times a second, forget the exact
> default hertz, but it is very SLOW in relative terms...
>
> The full generic 'telnet' command is -
>
> --telnet=foo,bar,<POLLRATE>,foo,<PORT>,bar
>
> The 'foo' and 'bar' can be anything, and are ignored.
>
> If you want the interface polled at your current frame
> rate, then the POLLRATE used should be greater than
> your frame rate...
>
> I usually use 100, but that does NOT mean it is polled
> faster than your frame rate ;=)) but at least AT your
> frame rate...
>
> 2. client - a tcp client to connect to the PORT
>
> Below I give a working examples in perl, but it should be
> easy to translate that to C/C++, or any other language
> of your choice...
>
> You have to get to 'know' the hundreds of properties
> that can be read, and set. Use fgfs MENU Debug ->
> Browse Internal Properties to see all what is
> available...
>
> Of course setting some property will have
> no effect if over-written by some other control,
> input, like setting the elevators, and then moving
> the joystick, or up-arrow key...
>
> And some properties are 'tied' to others, which can
> effect what happens, and you need to have some awareness
> of what is returned - a string, double, bool, etc...
>
> Lots of fun in learning ;=))
>
> And if thought suitable, maybe the below perl
> tested example could be added to the wiki...
>
> HTH.
>
> Regards,
> Geoff.
>
> <fg-telnet.pl>
> #!/usr/bin/perl
> use strict;
> use warnings;
>
> use IO::Socket;
> use Term::ReadKey; # for ReadMode
>
> # run fgfs with TELNET enabled
> # --telnet=foo,bar,100,foo,5555,bar
>
> # otions
> my $send_run_exit = 0; # if you want fgfs to shut down
>
> my ($FGFS_IO); # Telnet IO handle
>
> my $PORT = 5555;
> my $HOST = 'localhost'; # or IP address
> my $TIMEOUT = 3;
>
> # some properties
> my $get_Altitude = "/position/altitude-ft";
> my $get_Altitude_AGL = "/position/altitude-agl-ft";
> my $get_Latitude_deg = "/position/latitude-deg";
> my $get_Longitude_deg = "/position/longitude-deg";
> my $get_Track = "/orientation/track-magnetic-deg";
> my $nav_stg = "/instrumentation/nav/frequencies/selected-mhz";
> # Did not show - maybe the wrong property...
> #my $hdg_bug_stg = "/autopilot/settings/heading-bug-deg";
> my $hdg_bug_stg = "/instrumentation/heading-indicator/heading-bug-deg";
>
> my @warnings = ();
>
> sub prt($) { print shift; }
> sub prtw($) {
> my $msg = shift;
> push(@warnings,$msg);
> prt($msg);
> }
>
> # ### FG TELNET CREATION and IO ###
> # ==================================
>
> sub fgfs_connect($$$) {
> my ($host,$port,$timeout) = @_;
> my $socket;
> STDOUT->autoflush(1);
> prt("Connect $host, $port, timeout $timeout secs ");
> while ($timeout--) {
> if ($socket = IO::Socket::INET->new(
> Proto => 'tcp',
> PeerAddr => $host,
> PeerPort => $port)) {
> prt(" done.\n");
> $socket->autoflush(1);
> sleep 1;
> return $socket;
> }
> prt(".");
> sleep(1);
> }
> prt(" FAILED!\n");
> return 0;
> }
>
> sub fgfs_send($) {
> print $FGFS_IO shift, "\015\012";
> }
>
> sub fgfs_set($$) {
> my ($node,$val) = @_;
> fgfs_send("set $node $val");
> return 1;
> }
>
> sub pgm_exit($$) {
> my ($val,$msg) = @_;
> # ...
> if ($send_run_exit) {
> fgfs_send("run exit"); # YAHOO! THAT WORKED!!! PHEW!!!
> sleep(5);
> }
> prt("Closing telnet IO ...\n");
> if (defined $FGFS_IO) {
> close $FGFS_IO;
> undef $FGFS_IO;
> }
> ReadMode('normal'); # not sure this is required, or what it does
> exactly
> if (@warnings) {
> prt(join("\n",@warnings)."\n");
> }
> prt($msg) if (length($msg));
> exit($val);
> }
>
> sub get_exit($) {
> my ($val) = shift;
> pgm_exit($val,"fgfs get FAILED!\n");
> }
>
> sub fgfs_get($$) {
> my ($txt,$rval) = @_;
> fgfs_send("get $txt");
> eof $FGFS_IO and return 0;
> ${$rval} = <$FGFS_IO>;
> ${$rval} =~ s/\015?\012$//;
> ${$rval} =~ /^-ERR (.*)/ and (prtw("WARNING: $1\n") and return 0);
> return 1;
> }
>
> sub fgfs_get_aero($) {
> my $ref = shift; # \$aero
> fgfs_get("/sim/aero", $ref) or get_exit(-2); # string
> return 1;
> }
>
> ### main ###
> # get the TELENET connection
> $FGFS_IO = fgfs_connect($HOST, $PORT, $TIMEOUT) ||
> pgm_exit(1,"ERROR: can't open socket! Is FG running, with TELNET
> enabled?\n");
>
> ReadMode('cbreak'); # not sure this is required, or what it does exactly
>
> fgfs_send("data"); # switch fgfs exchange to data mode
>
> # now you can read/write properties
> # =================================
>
> # read a few...
> my ($aero,$alt,$agl,$lat,$lon,$track,$bug,$nav);
> fgfs_get_aero(\$aero); # I like to setup little subs
> fgfs_get($get_Altitude,\$alt) or get_exit(-2); # but direct is ok
> fgfs_get($get_Altitude_AGL,\$agl) or get_exit(-2);
> fgfs_get($get_Latitude_deg,\$lat) or get_exit(-2);
> fgfs_get($get_Longitude_deg,\$lon) or get_exit(-2);
> fgfs_get($get_Track,\$track) or get_exit(-2);
> prt("Presently flying [$aero], at $lat,$lon, $alt feet, $agl AGL, on
> $track\n");
>
> # and say you have set the autopilot to follow the
> # heading bug, or navaid...
> $bug = int($track + 0.5);
> $bug += 20; # swing 20 degrees
> $bug -= 360 if ($bug > 360);
> $nav = '118.5';
> prt("Setting heading bug to $bug, nav to $nav\n");
> fgfs_set($hdg_bug_stg,$bug); # hmmm, no show - maybe wrong property!
> fgfs_set($nav_stg,$nav); # this works...
>
> # etc etc etc until exit
>
> pgm_exit(0,"The End\n");
>
> # eof
> </fg-telnet.pl>
>
> On Sun, 2012-06-24 at 12:04 -0500, Sanny wrote:
> >
> > Hello!
> >
> > My name is Sanny, i'm ecuadorian, i speak spanish and i'm trying to
> > improve my english apologize me for this :)
> >
> > I'm trying to make a flight simulator, but there are certain things
> > that i don't know. I want to have on my computer a client-server
> > communication via socket, I want to send data and modify the
> > properties of the simulator from my socket server, I would like to
> > know what the operation and what should I do.
> >
> > Can you help me? :)
> >
> > Thanks!
> >
> > Sanny :)
>
>
>
>
> ------------------------------------------------------------------------------
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/flightgear-devel
>
--
Sanny :)
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