Xcode 8.3.2 cannot find CocoaAsyncSocket.h
I'm an old-school c/c++ programmer new to the Xcode IDE, tasked with creating an app for iOS that can receive data from an IPv4 multicast address. Since Swift 3 doesn't have an API for joining to a multicast address or binding to a port, I need to embed Objective-C code in the Swift code.
I have found a number of ways to do it with an asynch UDP socket, but when I reference either CocoaAsyncSocket.h (or GCDAsyncUdpSocket.h), I get an error "Module 'CocoaAsyncSocket' not found." Indeed, if I do a file search, I come up dry.
I don't see that Objective-C or its libraries can be downloaded from Apple, and they didn't come along when I downloaded Xcode 8.3.2, nor can I locate an Open Source version. Can anyone provide some pointers? Thanks!
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