You should configure it the same way you usually configure it. Something like this:
http://your.server.ip.address:5055
@Anton
should the server ip address be my default gateway on traccar client, since my traccar web and client connected in same network?
If it's the same network you can use local IP obviously.
well, to be specific I cloned traccar repo. Now traccar web app(modern) is running on the development server, which is "localhost:3000" . I want to add device from the web app and want to see on/offline status real-time. So how I should configure Server URL on traccar client.