ST and Chromecast


I am new to this automation stuff. But I have bought a Raspberry PI for integration with Chromecast.

I have installed the Rasbian and the node.js. But it is not working for me, I have created then smartapp and device handlers in ST, but I have no connection from ST app on my phone.

I think I am missing something, but I am not able to find the answer by searching in here.

Can someone please help me?