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Thanks for your reply.I use the `dns_sd.h` api to search for other devices(Apple device and non Apple device) which pulish itself, and they can find each other on the same infrastructure Wi-Fi, but it does not work when the device leaves Wi-Fi. I found a flag named `kDNSServiceFlagsIncludeP2P` and an interface index named `kDNSServiceInterfaceIndexP2P` in `dns_sd.h`, can I use it to establish a p2p connection between Apple device and non Apple device without the same infrastructure Wi-Fi?

Helpful FAQ.Hi eskimo. Is there any change in the peer-to-peer networking space now(early 2019)?