The Django backend will have a websocket port listening for connections. As soon as the user logs in to the dashboard regardless if it's an esi-ui panel or not, the frontend will establish a websocket connection in esi.service.js. On connection establish, django will poll node, lease, and offer data and send it to the client at a configurable rate. esi.service.js will implement a handler function that updates the variables for lists of nodes, leases, and offers. The controllers will call a service function that returns a promise that indicates that new data has arrived, retrieve that data from the service, format the data to display with a timestamp, and then repeat.