This example demonstrates a minimal event-listener setup that subscribes to a live message stream and logs each incoming event to the browser console. It shows how a single JavaScript file can establish a real-time connection to a remote hub using the native EventSource API, which handles the server-sent events protocol. The code defines a fixed channel list—alfa, bravo, and charlie—via the URL string, then attaches an `onmessage` handler to print every message object as it arrives. No visualization or data transformation occurs; the focus is purely on the listening and logging mechanism.