Chromecast icon not shown with local ip - chromecast

I'm createing a chromecast app for android. I registered my application on Google Cast SDK Developer Console and used the id from there.
As a test I first entered https://google.com as url for my application. that worked perfectly fine. i then changed this url to a local one http://192.168.0.18:8100. Problem is, it allways opens google on chromecast. so i created a new application, but since i did that, the cast button is not shown anymore.
Is my local url valid for chromecast and maybe does it take some time to accept my changed in cast sdk console?
thanks

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If you want to be able to provide media just like someone like Spotify or a local streaming radio station does, you need to parter with Google. You'll then have access to a range of partner solution feed options.
If you have other cast apps that you want, or other things that you may want to cast to a tv (for example) - these aren't currently available. However, Smart Displays using the Assistant are coming shortly, and these may start to introduce capabilities that will also be available for cast devices.
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You need to have your own application id (by registering your app in Cast Developer Console). Follow the instructions for registration and in that same page, scroll down to Devices and follow those steps as well. After all of that, give it a bit of time, reboot your chromecast and it should work when your app is running on the chromecast.

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EDIT:
I found this source to be a good example to demonstrate how to use it. The HTML in the receiver is what you would have the white listed URL pointing to.
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