How to let web-socket server and client communicate until server stops sending the data?

I am working on a group project where we have a rover which has Raspberry Pi (Python) sending the location in coordinates to a javascript webpage. I can successfully create a simple echo python server and javascript client but want to learn how We can keep the client and server running where the Server is giving out coordinates of the rover continuously to the javascript client till Rover reaches its destination and the connection closes.