chromecasts | local network for Chromecasts and have them play media | Media library

I'm trying to test an iOS app on the Xcode simulator and all networking is fine except for the Google Cast SDK can't find any Chromecasts on my network using wifi. The iMac that Xcode is running on can find the Chromecasts just fine using wifi. The same app on another computer can find them just fine on the simulator also using wifi.

I also tried the Google sample from Github and it can't find any Chromecasts either.

I already added the Simulator app to the firewall exceptions. I also tried it with the firewall off.

What else do I need to do?

Xcode 9.4.1

Thanks.

So a couple of month back I wrote a test sender to get some experience with Cast senders. It worked fine and I could send images and videos to my Chromecasts.

I now need to create a custom receiver and I wanted to use my old sender to test my receiver code. However, my sender doesn't work anymore eventhough I didn't change anything since then.

The errors i'm now getting in Chrome's console are the following:

• GET file://www.gstatic.com/cast/sdk/libs/sender/1.0/cast_framework.js net::ERR_FILE_NOT_FOUND

• Uncaught ReferenceError: cast is not defined
  at window.__onGCastApiAvailable (script.js:84)
  at chrome.cast.cb (cast_sender.js:99)

When I look at the "Network" tab I can see that the cast_framework.js file failed to load after 22s.

I then tried to use the sample on Google's Github to see if it was my sender that was at fault but I get the same error.

I also can reach the devices with the Cast button in Chrome's menu.

What is going on with that file? Is it my browser that has a problem? Is it my devices?

Background: My company is moving into new offices and we would like to control all of the LCD TVs on our walls (around 50 screens) using Chromecast Ultra devices, such that each will display a different webpage. So that's 50 Chromecasts that will be connected via Ethernet to our local network.

I reviewed the Cast SDK documentation on how to build a custom receiver application, but to my understanding this is for sending a message to a single device every time. I wish to build a simple control panel (can be either a web app or an Android app), where I can select a number of Chromecast devices and send all of them a message (with a URL to load).

Can a message be sent to multiple Chromecast devices at once, without having to send the message to each device manually?

I'm building an app that can cast to both Chromecast and AppleTV devices. Discovery of these devices is working: ChromeCasts are discovered using the MediaRouter and AppleTVs are discovered using SSDP. At the moment, I have a regular button that displays an combined list of discovered devices, but I'd like to have it use the fancy cast button.

Is there an elegant way to extend the MediaRouteButton to display my own list of discovered devices or should I just be creating my own button from scratch with the cast drawables?

I know that the MediaRouteButton class can be extended, but I'm not sure how to apply my extended button to the button declared via xml. I feel like I'm missing something painfully obvious, but I haven't found it yet.