MQTT-NDOV

This repo contains scripts that bridge Dutch Public Transit messages from ZMQ to MQTT and offers some nice additional features. Stichting OpenGeo provides NDOV-Loket and provides feeds over ZMQ that these scripts listen to and forward over MQTT.

User Manual

A staging server is offered on mqtt.joelhaasnoot.nl. Use the following notes to understand how the data is structured.

Raw Topics

The following topics forward the raw stream of messages

• Train data from NS is fed as ns/<original zmq topic>, as a stream. In practice this means:
  • ns/RIG/InfoPlusDVSInterface4 -> Stream of DVS messages ("dynamic departure message" - per service, per stops)
  • ns/RIG/InfoPlusDASInterface4 -> Stream of DAS messages ("dynamic arrival message" - per service, per stop)
  • ns/RIG/InfoPlusDASInterface4 -> Stream of RIT messages (complete trip details, per service, all stops)
  • ns/RIG/NStreinpositiesInterface5 -> Stream of train GPS positions
  • and some others (mainly messages related to disruptions)
• Other transit operators use BISON standards. In practice:
  • bison/ARR/KV6posinfo - Arriva KV6 (position) messages
  • bison/ARR/KV17cvlinfo - Arriva KV17 (service change) messages
  • bison/ARR/KV17cvlinfo - Arriva KV17 (service change) messages
  • And these three topics repeated for the operators QBUZZ, CXX, KEOLIS, IVU (supplier for Qbuzz), RIG (supplier for HTM, RET), GVB, EBS, OPENOV (supplies TEC)
• SIRI feeds from transit operators are fed as siri/<original zmq topic>. Again, in practice:
  • siri/GVB/EstimatedTimetableDelivery - SIRI EstimatedTimetable for GVB (Amsterdam)
  • siri/GVB/VehicleMonitoringDelivery - SIRI VehicleMonitoring for GVB (Amsterdam)

Structured Topics

Details to follow

Other notes

• It is possible to use Quality of Service (QoS) level 1 to make sure you don't miss messages. If this leads to performance issues, this will be disabled or restricted to registered users
• For the non stream topics, the latest message is retained. This is so that you can (re)connect and find a message, as long as you know the topic you're looking for.
• The messages expire however after about a day
• Currently, there is no implementation over SSL on the staging server

Admin Manual

To run on your own server - change config.py or create local_config.py and specify the options. scripts/ contains systemctl unit files.