Flipper Zero, part 3: Sub-GHz remotes, rolling codes and how gates should be built

Part 3 of 5 in the Flipper Zero series. Part 1: what it actually is and what it can’t do. Part 2: why so many office badges are weaker than they look. Garage doors, gates, car fobs, doorbells and cheap alarm sensors all talk on a handful of license-free bands, mostly around 315, 433.92, 868…