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Net::GPSD.3pm

NAME

Net::GPSD - Provides an object client interface to the gpsd server daemon.

SYNOPSIS

  use Net::GPSD;
  $obj=Net::GPSD->new;
  my $point=$obj->get;
  print $point->latlon. "\n";
 
 

or

  use Net::GPSD;
  $obj=Net::GPSD->new;
  $obj->subscribe();
 
 

DESCRIPTION

Net::GPSD provides an object client interface to the gpsd server daemon. gpsd is an open source GPS deamon from http://gpsd.berlios.de/.

For example the get method returns a blessed hash reference like

  {S=>[?|0|1|2],
   P=>[lat,lon]}
 
 

Fortunately, there are various methods that hide this hash from the user.

CONSTRUCTOR

new

Returns a new Net::GPSD object.

  my $obj=Net::GPSD->new(host=>"localhost", port=>"2947");
 
 

METHODS

get

Returns a current point object regardless if there is a fix or not. Applications should test if $point->fix is true.

  my $point=$obj->get();
 
 

subscribe

The subscribe method listens to gpsd server in watcher (W command) mode and calls the handler for each point received. The return for the handler will be sent back as the first argument to the handler on the next call.

  $obj->subscribe();
  $obj->subscribe(handler=>\&gpsd_handler, config=>$config);
 
 

getsatellitelist

Returns a list of Net::GPSD::Satellite objects. (maps to gpsd Y command)

  my @list=$obj->getsatellitelist;
  my $list=$obj->getsatellitelist;
 
 

host

Sets or returns the current gpsd host.

  my $host=$obj->host;
 
 

port

Sets or returns the current gpsd TCP port.

  my $port=$obj->port;
 
 

baud

Returns the baud rate of the connect GPS receiver. (maps to gpsd B command first data element)

  my $baud=$obj->baud;
 
 

rate

Returns the sampling rate of the GPS receiver. (maps to gpsd C command first data element)

  my $rate=$obj->rate;
 
 

device

Returns the GPS device name. (maps to gpsd F command first data element)

  my $device=$obj->device;
 
 

identification (aka id)

Returns a text string identifying the GPS. (maps to gpsd I command first data element)

  my $identification=$obj->identification;
  my $identification=$obj->id;
 
 

protocol

Returns the GPSD protocol revision number. (maps to gpsd L command first data element)

  my $protocol=$obj->protocol;
 
 

daemon

Returns the gpsd daemon version. (maps to gpsd L command second data element)

  my $daemon=$obj->daemon;
 
 

commands

Returns a string of accepted command letters. (maps to gpsd L command third data element)

  my $commands=$obj->commands;
 
 

FUNCTIONS

time

Returns the time difference between two point objects in seconds.

  my $seconds=$obj->time($p1, $p2);
 
 

distance

Returns the distance difference between two point objects in meters. (simple calculation)

  my $meters=$obj->distance($p1, $p2);
 
 

track

Returns a point object at the predicted location in time seconds assuming constant velocity. (Geo::Forward calculation)

  my $point=$obj->track($p1, $seconds);
 
 

GETTING STARTED

Try the examples in the bin folder. Most every method has a default which is most likely what you will want.

KNOWN LIMITATIONS

The distance function is Geo::Inverse.

The track function is Geo::Forward.

All units are degrees, meters, seconds.

BUGS

No known bugs.

EXAMPLES

AUTHOR

Michael R. Davis, qw/gpsd michaelrdavis com/

LICENSE

Copyright (c) 2006 Michael R. Davis (mrdvt92)

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

Geo::Inverse Geo::Forward