GoogleCast

bash

This component allows you to communicate with Chrome Cast dongles or smart TVs that support the Google Cast Protocol.

Using

1. Add these lines to your application componenent.mk file:

   COMPONENT_DEPENDS += GoogleCast
   ENABLE_SSL := Bearssl

2. Add these lines to your application:

   #include <Network/GoogleCast/Client.h>

3. Basic example:

   #include <Network/GoogleCast/Client.h>
   
   GoogleCast::Client castClient;
   
   void gotIp(IpAddress ip, IpAddress mask, IpAddress gateway)
   {
      // connect directly to the IP of the devise
      castClient.connect(IpAddress("192.168.10.15"));
   
      castClient.onConnect([](bool success) {
         Serial.print(F("Client connect: "));
         Serial.println(success ? "OK" : "FAIL");
         if(success) {
           // Starting YouTube on the device
           castClient.receiver.launch(APPID_YOUTUBE);
         }
      });
   }

Re-Generating C files from proto file

You can re-generate the C files from the proto file. This can be useful if you want to use a newer version of the Google Cast proto file. Make sure to compile it using nanopb. The re-generation can be done with the commands below:

cd $SMING_HOME/Libraries/GoogleCast/samples/basic
make python-requirements # should be executed once to download and install the required python packages
make rebuild-cast-proto

Protocol

There are multiple documents in internet that describe the Google Cast protocol and its inner workings. As a start one can take a look at the presentation and documents below.

• Presentation with insights.
• Protocol description.
• Reference python implementation (for Home Assistant).
• Application in C++/Qt.

App-Ids

List of current APP-IDS https://clients3.google.com/cast/chromecast/device/baseconfig

Individual app configurations are obtained from this url: https://clients3.google.com/cast/chromecast/device/app?a={appid}

Where {appid} is the id of the app, and the output of this is JSON in the format of a receiver app definition.