DTH for Chromecast / Google Home

I have created a free Horuku app and downloaded the git files from https://github.com/germasch/smartthings-cast

Managed to add devices via the smart app. However, neither the test or any other TTS seems to be working. Here is some logs from Heroku -

2017-08-23T09:39:06.211569+00:00 heroku[router]: at=info method=POST path="//volume" host=my-super-duper-test.herokuapp.com request_id=9679db53-7799-4be7-a306-6233cb5a002a fwd=“52.213.26.200” dyno=web.1 connect=0ms service=4ms status=404 bytes=391 protocol=https
2017-08-23T09:39:10.371399+00:00 heroku[router]: at=info method=POST path="//playMedia" host=my-super-duper-test.herokuapp.com request_id=d248e3b9-1a20-4882-93f7-2d5d0d89db56 fwd=“52.213.77.134” dyno=web.1 connect=0ms service=7ms status=404 bytes=394 protocol=https
2017-08-23T09:39:20.059291+00:00 heroku[router]: at=info method=POST path="//playMedia" host=my-super-duper-test.herokuapp.com request_id=7880b93d-f1fe-443f-9c68-22f6f124b8d4 fwd=“52.213.26.200” dyno=web.1 connect=1ms service=12ms status=404 bytes=394 protocol=https

Here is the snapshot of my router and despite trying to do the port forwarding nothing seems to work. And as you can see from the snapshot, i’m not able to enter the same port number (8009) as the external port. Ami doing this right?

Can anybody help?