Contributing

If you have a question, found wrong/outdated data or want to propose a new data structure, create an Issue.

Scope

This project intends to include…

…S-Bahn stations, but so far WIFI@DB/FREE_WIFI@BAHNHOF WiFis have been rare.
…public WiFis at public transportation infrastructure outside of Berlin.

Travel to the station.
Look for access points.
- BVG Wifi APs are white, either hanging from the ceiling or mounted on the roof of conductor sheds.
- I helps to have a phone showing the current WiFi signal strength accurately, walking around to find it.
Make sure you are connected to that specific access point.
- I usually wait for the WiFi to hand my device over to the access point I've just walked to. With BVG WiFi, this takes ~5 seconds.
Determine the BSSID of the access point.
- Keep in mind that access points might have 2 different BSSIDs for 2.4GHz/5Ghz. I haven't seen this with BVG WiFi though.
- On iOS, you can only read the BSSID of the Wifi you're connected to. Use e.g. Net Analyzer.
- On MacOS, you can read BSSIDs of all nearby access points and their signal strengths:
  1. Open Wireless Diagnostics.app.
  2. Select Window > Scan.
Determine the MAC address(es) of the access point.
- Keep in mind that access points usually have 2 MAC addresses for 2.4GHz/5Ghz.
- On iOS, you cannot read the MAC address.
- On most Unix/Linux operating systems, you can get the MAC address of the connected access point using arp -a.

Depending on the size of the station, for BVG WiFi this took me about 3-10 minutes per station.

Keep in mind that this project is unlicensed and therefore in the public domain. You will have to waive your copyright claims when contributing.