Question: Is there a way to manually test/debug hbbtv app on a real TV. 

I already tried plugins for opera/ff plugins and successfully run through static validators like <http://hbbtv-live.irt.de/validator/>.

Answer: 
We are using the following approach:

Take a Modulator like the Dektec DTU 315 (<http://www.dektec.com/products/USB/DTU-315/>) and the Brahms Software of the IRT (<https://www.irt.de/en/products/media-services-and-applications/brahms/>)

then you can also create you "own TV Station" 

With the Brahms Software you can simply create your signal, take any video and add you hbbTV content to the signal.

Then the only thing you need to do is to find the TV station on your TV and start using the hbbTV application there
Kai comment is right. I will just add some other ways for HbbTV testing on real devices, which I tried.

1. [Suitest](https://suite.st/pricing.html), complete solution, which is great for debugging and automated testing
2. [Mautilus HbbTV Playout kit](https://www.mautilus.com/products/hbbtv-playout-kit/) for quick testing on many devices - it's a small box broadcasting a local DVB-T multiplex.