DVB broadcast is linear, HTTP is not. HbbTV is a standard binding world of linear broadcast and stateless HTTP together.
There are many challenges to correctly handle web content in TVs, especially with a completely different approach from broadcasters.
I will show you, how to serve advertisements and measure traffic to hundreds of thousands always connected devices on the single server. With just 40% of devices capable of WebSocket, you have to find ways to get performance elsewhere. Ad targeting and caping in shared memory for linear subscribers on 10+ years old devices with Python and uWSGI.