Here are the instructions to run the Dragonfly App positioning at computer’s start-up in a “forever” manner (meaning that in the rare eventuality that Dragonfly crashes, it is automatically restarted and only a clean termination can avoid the automatic re-start) on Ubuntu.

Step 1 – Auto start the positioning and auto re-start Dragonfly in case of crashes

These are the steps to create a script that automatically starts the positioning when the Dragonfly App is launched and automatically re-start the Dragonfly App in case of crashes.

• Install cURL with this command!
  sudo apt install curl
• Go to Dragonfly’s root directory, where dfja-2.4.0.21-dist.jar resides.
• Create a file called
  start-forever-navigation.sh:
touch start-forever-navigation.sh

• Fill it with the following content:
  #!/bin/bash
function start_dragonfly() {
dragonfly_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
cd $dragonfly_dir
java -jar dfja-2.4.0.21-dist.jar &
dragonfly_pid=$!
while [[ -z `curl -s localhost:5000/api/v1/utils/status -X GET | grep "\"state\": 1"` ]]; do
sleep 1
done
curl -s -o /dev/null localhost:5000/api/v1/maps/MAP_NAME -X GET
sleep 7
curl -s -o /dev/null localhost:5000/api/v1/positioning/start -X PUT
wait $dragonfly_pid
return $?
}
until start_dragonfly; do
echo "Server 'Dragonfly' crashed with exit code $?. Respawning.." >&2
sleep 1
done


• Make the script executable:
  chmod +x start-forever-navigation.sh

Step 2 – Launch Dragonfly automatically at start-up

These are the steps to automatically launch the Dragonfly App at computer’s start-up.

• Run the following command to open the crontab editor. NOTE: at first start, you may be asked for a text editor, please select
  nano as it is the easiest to use:
  crontab -e

• Add the following line:
  @reboot /home/path_to_the_directory_where_the_start_forever_navigation_resides/start-forever-navigation.sh

• Save with Ctrl+O and quit with Ctrl+X.