EMANE GPSD Integration

Overview

Introduction to integrating gpsd in CORE with EMANE.

EMANE Demo 0 may provide more helpful details.

!!! warning

Requires installation of [gpsd](https://gpsd.gitlab.io/gpsd/index.html)

Run Demo

Select Open... within the GUI
Load emane-demo-gpsd.xml
Click
After startup completes, double click n1 to bring up the nodes terminal

Example Demo

This section will cover how to run a gpsd location agent within EMANE, that will write out locations to a pseudo terminal file. That file can be read in by the gpsd server and make EMANE location events available to gpsd clients.

EMANE GPSD Event Daemon

First create an eventdaemon.xml file on n1 with the following contents.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE eventdaemon SYSTEM "file:///usr/share/emane/dtd/eventdaemon.dtd">
<eventdaemon nemid="1">
    <param name="eventservicegroup" value="224.1.2.8:45703"/>
    <param name="eventservicedevice" value="ctrl0"/>
    <agent definition="gpsdlocationagent.xml"/>
</eventdaemon>

Then create the gpsdlocationagent.xml file on n1 with the following contents.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE eventagent SYSTEM "file:///usr/share/emane/dtd/eventagent.dtd">
<eventagent library="gpsdlocationagent">
    <param name="pseudoterminalfile" value="gps.pty"/>
</eventagent>

Start the EMANE event agent. This will facilitate feeding location events out to a pseudo terminal file defined above.

emaneeventd eventdaemon.xml -r -d -l 3 -f emaneeventd.log

Start gpsd, reading in the pseudo terminal file.

gpsd -G -n -b $(cat gps.pty)

EMANE EEL Event Daemon

EEL Events will be played out from the actual host machine over the designated control network interface. Create the following files in the same directory somewhere on your host.

!!! note

Make sure the below eventservicedevice matches the control network
device being used on the host for EMANE

Create eventservice.xml on the host machine with the following contents.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE eventservice SYSTEM "file:///usr/share/emane/dtd/eventservice.dtd">
<eventservice>
    <param name="eventservicegroup" value="224.1.2.8:45703"/>
    <param name="eventservicedevice" value="b.9001.1"/>
    <generator definition="eelgenerator.xml"/>
</eventservice>

Create eelgenerator.xml on the host machine with the following contents.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE eventgenerator SYSTEM "file:///usr/share/emane/dtd/eventgenerator.dtd">
<eventgenerator library="eelgenerator">
    <param name="inputfile" value="scenario.eel"/>
    <paramlist name="loader">
        <item value="commeffect:eelloadercommeffect:delta"/>
        <item value="location,velocity,orientation:eelloaderlocation:delta"/>
        <item value="pathloss:eelloaderpathloss:delta"/>
        <item value="antennaprofile:eelloaderantennaprofile:delta"/>
    </paramlist>
</eventgenerator>

Create scenario.eel file with the following contents.

0.0  nem:1 location gps 40.031075,-74.523518,3.000000
0.0  nem:2 location gps 40.031165,-74.523412,3.000000

Start the EEL event service, which will send the events defined in the file above over the control network to all EMANE nodes. These location events will be received and provided to gpsd. This allows gpsd client to connect to and get gps locations.

emaneeventservice eventservice.xml -l 3

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