In my previous post, I explored how the cast device find and configure the Chromecast dongle. In this post, I'll dig into the actual cast process.

There are plenty resources online that explains how Chromecast works. But most of them focus on up-layer protocols, such as mDNS, DIAL/HTTP. I am more interested in the 802.11 MAC layer. In particular, I was curious in questions such as:

• What happens when you set up a Chromecast?
• How the cast device (such as an Android phone) and Chromecast communicate (in 802.11 layer)?

Some of the questions were obvious, others are not. In this post, I will document the process about the Chromecast setup process. This will be the first of the series of posts on this topic.