App lifecycle
Entire thing is based around DIAL Protocol, which is used for discovery. Google extended Protocol with dynamic app creation and RESt interface to webchannel creation. Google also added extension to LEAP protocol when app is running. This mainly consists of sockets creation url for app and quick info about media being played.
This step consist of establishing ChannelFactory service(created by screen app upon succesful launch) and subsequent Channels between Screen app and Mobile app. Screen app has only one ChannelFactory Service and many App channels. App channel consists of websocket connection to Screen app and Mobile app. Data is relayed between those two connections and no processing is done in underline relay mechanism. Commands are only processed for ChannelFactory. Those commands are REGISTER, NEWCHANNEL and CHANNELREQUEST.