The problem is implementing HTTP Live Streaming (also known as HLS) in HbbTV I can't find the solution
For example I tried this
<!DOCTYPE html>
<html>
<head>
<title>HbbTV Stream</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript">
function initApp() {
var videoElement = document.createElement("video");
videoElement.setAttribute("type", "application/vnd.apple.mpegurl");
videoElement.setAttribute("src", "http.//example.com/test.m3u8");
videoElement.setAttribute("data-fullscreen", "true");
videoElement.setAttribute("data-pauseonexit", "true");
videoElement.setAttribute("autoplay", "");
videoElement.addEventListener("error", function(e) {
console.log("Video error:", e);
});
document.body.appendChild(videoElement);
}
</script>
</head>
<body onload="initApp()">
</body>
</html> 
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This won't help with older devices, but if you're targeting HBBTV 2.0.3 or higher, the device should support Media Source Extensions, so you can try using javascript player, such as hls.js or similar.