iOS notes

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Compared with Osmosis on Android:

Must run on a physical iPhone. BLE and Wi-Fi-join do not work in the Simulator.
Joining the AP: NEHotspotConfiguration (needs the Hotspot Configuration entitlement). No bindProcessToNetwork equivalent — reach 192.168.2.1 by pinning sockets to the camera DHCP IPv4 (NWParameters.requiredLocalEndpoint, ephemeral local port). The SoftAP is internetless; iOS keeps cellular as the default route, so camera sockets also set prohibitedInterfaceTypes = [.cellular]. That does not yield a second Wi-Fi AP for watchers — Personal Hotspot while associated to the camera AP is not a supported backhaul. USB/Ethernet tethering is the plausible extra interface. Live media stays unicast to that one phone (live view).
Local Network permission (NSLocalNetworkUsageDescription) is required to talk to 192.168.2.1, plus a Bluetooth usage string.
No MAC/OUI over CoreBluetooth. Xtra 10004 identification keys off the BLE name (xtra / edge), not a MAC.
Pace fff5 writes with .withoutResponse + delays, same as Android.