I wanted to be able to show public transport information on my microcontroller of choice. The code I wrote is written for the ESP32 but also works on the ESP8266. It simply makes an HTTP-request at the 9292 API. The server then returns a JSON string with the information you requested. Then this information can be parsed so that you are left with the information you want, for instance the departure time of a specific train, or the destination of a bus of choice.
The information then can be displayed on a display of your choice.