Exploring the intricacies of Implementing Chromecast Networks, with a curious nod towards potentially mirroring it with

In my current project, I am aiming to replicate the functionality of a Chromecast on a Roku device. To achieve this, I need to first discover the Roku using UDP and then send an HTTP POST request to control it.

During a recent developer fest where I learned about the Chromecast, I was intrigued by how it uses SSDP for discovery. This inspired me to create an extension (heavily modified) that successfully locates my Roku device.

However, controlling the Roku has posed a challenge. I have encountered issues with sending requests to a different port (such as :8060) due to what I believe is a same origin policy. I am curious if anyone can shed light on how the Chromecast operates and if its methods could be adapted for my project. Alternatively, if you have a solution for enabling my extension to send an HTTP POST request to :8060 with a path like /keypress/Select, I would greatly appreciate any insights.

It is worth noting that when I attempt to send an XMLHttpRequest with just the IP address (without specifying the port), I receive a 200 successful response. However, this does not actually control the Roku. My understanding is that the port must be included for proper functionality.

javascriptgoogle-chrome-extensionxmlhttprequestchromecastroku

Answer №1

In a nutshell, I was struggling with figuring out what to do for my inputs. After some experimenting tonight, I found a solution that worked for me:

var xhttp = new XMLHttpRequest();

xhttp.open("POST","http://" + <ip>:<port> + "/keypress/Select",true);
xhttp.send();

It turns out that I had been using a packaged app instead of an extension, which explains why I couldn't use "sockets". I'm still facing a similar situation but I'm curious about how Chromecast manages to work around this limitation as an extension.

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