The Location-to-Service Translation (LoST) protocol [RFC 5222] has been designed to map a longitude and latitude pair to a public safety answering point (PSAP) that provides emergency (911) services at the location. The protocol was standardized by the IETF as part of the next-generation IP-based emergency calling architecture.

LoST 2.0 is an evolved version of the LoST protocol framework that solves a more general problem: discovering services pertaining to an area of interest represented with a geographic object. LoST 2.0 is intended as a building block of geographically dispersed networked systems, e.g., large or heterogeneous cyber-physical systems.

This repository contains the software used to prototype various LoST 2.0 protocol entities.

Please make sure you have a recent version of Python 3, preferably Python 3.9 or newer. Clone the repository into a local folder and enter the folder:

git clone https://github.com/irtlab/lost
cd lost

Create a Python virtual environment in the folder .venv and activate it:

python -m venv .venv
. .venv/bin/activate

Install the lost package in editable mode:

pip install -e .

Set the connection string for your PostgreSQL database in an environment variable DB_URL:

export DB_URL="host=<host> user=lostsrv password=<password> sslmode=require dbname=lost"

Run the LoST server. The server will listen on the loopback interface (127.0.0.1) and port 5000 by default:

lost-server

Use the lost-seeker program to send a LoST request to the server. To send a point use:

lost-seeker find-service -- lost -73.96094 40.80965

To send a polygon from a GeoJSON file use:

lost-seeker find-service -- lost data/cepsr-intersect.geojson