sebastianknopf

Realtime Vehicle Positions on Open-Data

Session notes about realtime vehicle position sharing at Open Transport Community Conference 2026

Problem and Motivation

• People enjoy using map-based applications, especially for navigation and in public transport
• Predicted ("realtime") timetable information are not precise in several cases
• Displaying the realtime vehicle positions offers an option for passengers to verify the prediction data
• Psychological effect of approvability for passengers with low barriers
• Already known from transport services like Uber

sebastianknopf

mthk-setup

This utility script generates X509 certificates out of the PKCS12 certificate issued by Mobilithek for client and server authentification. Optinally, the certificates can be installed at the correct location depending on your Linux distribution used. The setup is also able to generate a virtual host with Apache or Nginx.

Prerequisites

• Linux distributed OS
• OpenSSL for certificate and key extraction
• Apache/Nginx for generating a VHost

Usage

Extract certificate, chain and unprotected key:

sebastianknopf

using System.Globalization;
using System.Text;
using System.Text.RegularExpressions;

namespace Vdv
{
    public class X10File
    {
        #region Static Helper Methods
        public static X10File ReadX10File(string filename, string nullValue = "NULL", string encoding = "utf-8", Dictionary<string, object?>? filter = null)

sebastianknopf

using System.Text;

namespace CSV
{
    public class CsvReader : IDisposable
    {
        public List<string> Headers { get; protected set; }

        private StreamReader streamReader;
        private char delimiter;

sebastianknopf

This configuraiton utility has three main purposes...

1. Validate the given configuration for having all required keys
2. Setting defined default values for optional keys
3. Putting everything into the Configuration class

After running Configuration.apply_config(...), you simply can access your configs with Configuration.this.is.a.required.key or Configuration.this.is.an.optional.key.

v1.1: Now works also with repeated keys representing a list.

sebastianknopf

import csv
import re

from typing import Iterable

########################################################################################################################
# Helper class for reading and modifying *.x10 files.
########################################################################################################################

def read_x10_file(filename, null_value: str = 'NULL', encoding: str = 'utf-8', filter: dict|None = None) -> "X10File":

sebastianknopf

from threading import Timer

class RepeatedTimer(object):
    def __init__(self, interval, function, *args, **kwargs):
        self._timer     = None

        self.interval   = interval
        self.function   = function
        self.args       = args
        self.kwargs     = kwargs

sebastianknopf

import re

def exists(obj, path):
    path = path.split('.')
    
    level0 = path[0]
    level1 = '.'.join(path[1:])
    
    return obj is not None and hasattr(obj, level0) if len(path) == 1 else exists(getattr(obj, level0), level1) if hasattr(obj, level0) else False

sebastianknopf

import json
import os

from datetime import datetime
from lxml.etree import fromstring
from lxml.etree import tostring

class Datalog:

    @classmethod

sebastianknopf

import click
import csv
import duckdb
import polars

@click.command
@click.option('--file', '-f', help='Input CSV file')
@click.option('--db', '-d', help='DuckDB filename')
@click.option('--table', '-t', help='Destination table name to import the CSV file')
@click.option('--create-statement', '-c', default=None, help='Create statement filename for destination table')