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IIRC Apple uses some proprietary radio protocol (or maybe it’s just Bluetooth) to discover and communicate with nearby Apple products.

• nsagent 3y ago
  It uses Bonjour [1], which has an LGPL reimplementation named Avahi [2] [1]: https://en.m.wikipedia.org/wiki/Bonjour_(software) https://en.m.wikipedia.org/wiki/Bonjour_(software) [2]: https://en.m.wikipedia.org/wiki/Avahi_(software) https://en.m.wikipedia.org/wiki/Avahi_(software)
  • d1sxeyes 3y ago
    For the sake of being picky, Bonjour is not a radio protocol (Layer 1), it’s a set of tools which enable zero config networking (Layer 2/3)
    • nsagent 3y ago
      I agree, it's not a radio protocol and I wasn't trying to imply that it was. The person I was responding to posited it might be one and I pointed them to the protocol that's used without explicitly correcting them on that point.
      • d1sxeyes 3y ago
        Makes sense.
  • dartos 3y ago
    It can’t use just bonjour. Apple devices can detect out of network devices as well.