The CarPlay & AirPlay protocol, up close.
Notes from the team building CarCast — a protocol inspector for CarPlay and AirPlay. What we see on the wire, written down for the people building in the same corner.
New in iOS 27 · features + protocol
CarPlay in iOS 27
Every new CarPlay feature in iOS 27 versus iOS 26 — native video apps, the new Siri, MiniPlayer, scrubbing, any widget, EV route sharing, wireless fixes — plus the four things that changed on the wire, including why older head units stall.
New in iOS 26 · protocol
Video on the Dash
iOS 26 quietly opened video on the CarPlay screen. Here's the shape of the
problem on the wire — why it isn't screen mirroring, the single videoPlayback
gate in /info, and how a URL fling actually flows.
More notes in the pipe — the DRM key courier, the /info capability surface, wireless CarPlay. Check back.