How to Establish a WebSocket Client Connection to a Server Using an OCPP-Compatible ws:// URL

[goaldaika]

I have cloned the repository and aim to establish a WebSocket server to facilitate communication and control with a standby client station using the OCPP protocol. The WebSocket connection should follow the format ws://[server_ip]:[port]/ocpp/[chargepoint_identity].
Upon reviewing the codebase, I noticed that only HTTP URL configurations are implemented. Could you provide guidance or code modifications to establish a WebSocket server compatible with the OCPP protocol for the specified URL format?
Specifically, I need assistance in setting up the WebSocket server to handle connections and manage communication with the client using the provided WebSocket URL structure.

[dallmann-consulting]

https://sookocheff.com/post/networking/how-do-websockets-work/

WebSockets begin life as a standard HTTP request and response. Within that request response chain, the client asks to open a WebSocket connection, and the server responds (if its able to). If this initial handshake is successful, the client and server have agreed to use the existing TCP/IP connection that was established for the HTTP request as a WebSocket connection. Data can now flow over this connection using a basic framed message protocol. Once both parties acknowledge that the WebSocket connection should be closed, the TCP connection is torn down.

[goaldaika]

Open one of the simulators in the browser and enter "ws://localhost:8081/OCPP/station42" as the central station URL. "station42" is the ID of the chargepoint you created in the previous step.
In case I want to connect from another computer or charging station, how should I change the address in the browser ? From what I understand in your readme, I assume that I should change the url in AppSetting.Json from localhost to "0.0.0.0", but for the websocket url,should be the server address or the client address or also "0.0.0.0" ?

[andreasringdal]

0.0.0.0 in the configuration tells the ocpp server that it should listen to all ipadresses. If you use 127.0.0.1 in the config it will only be reachable form other applications/services on the same computer.

In order to connect to the running server from another computer you need to find you local ip address. Google how to find you local ip address on either Windows, Macos or Linux