Does CFNetwork provide API to open a socket on a particular interface? This post suggestsusing SCNetworkInterfaceCopyAll and SCNetworkInterfaceGetInterfaceType to find an interface with a desired type. But I get an error saying SCNetworkInterfaceCopyAll is unavailable in Xcode 8.3.2.If SCNetworkInterfaceCopyAll is unavailable, how would you search the result of getifaddrs to find an interface with a type (e.g. kSCNetworkInterfaceTypeIEEE80211 (wifi) vs kSCNetworkInterfaceTypeWWAN (cell)).Thanks!