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Send Route (gpx).md

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Send Route (gpx).md

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HowTo: Parse a gpx-File and Store the Locations in Orion Context Broker/FROST-Server

This short "how to" will show how to parse a gpx-file with xmlstarlet and send the positions timed with oscsim.

Prerequisites

  • You need a gpx-file with a route.
  • xmlstarlet need to be installed.

Install xmlstarlet

Find out, how to install xmlstarlet here.
If you want to dive into this great tool, please refer to its documentation.

Prepare a Route-File

There are lots of Tools out there letting you define a route and export it in gpx format.
As an example, I will show how to achieve this with GPX Generator.

  • Open the website.
  • Start creating the route by clicking waypoints.
    Note: The timespan between two waypoints is calculated by the distance and the chosen speed. You can even simulate velocity by increasing the speed from point to point.
  • When ready, export the route in gpx-format into a file (e.g. sample.gpx).

The exported file will look like:

<?xml version="1.0"?>
<gpx version="1.1" creator="gpxgenerator.com">
<wpt lat="51.726578514305174" lon="8.759472002022175">
    <ele>112.62</ele>
    <time>2021-03-30T09:53:58Z</time>
</wpt>
<wpt lat="51.72652534946479" lon="8.759300340645222">
    <ele>112.75</ele>
    <time>2021-03-30T09:53:59Z</time>
</wpt>
<wpt
    ...    
</wpt>
</gpx>

Find a short gpx-file (sample.gpx) in the files-folder for a first try.

Prepare the Script

Take the script from the files-folder and change

  • the filename of the gpx-file to your needs (line #4)
  • the call to oscsim to your needs (line #60)

Run the Script

Let the script run and voilá - we are simulating a bus driving through your city continuously sending its location!