How to fetch address from CocoaAsyncUDPSocket

Question

Does anyone know how the delegate method for receiving UDP data in CocoaAsyncSockets work when it comes to fetching the source address? Specifically the method

-(void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext

The address comes back as NSData* but interpreting it using NSUTF8StringEncoding returns null and NSASCIIStringEncoding returns a bunch of garbled characters. How is it supposed to be interpreted?

Yeah, I want to accomplish is more or less the same. I did however find a more effective solution than the one posted there. — Rick, Aug 01 '13 at 14:10
For IPv4 addresses that is fine. I posted the "more complicated" code there because it works also with IPv6, which is used more and more. — Martin R, Aug 01 '13 at 14:14

score 2 · Accepted Answer · answered Aug 01 '13 at 13:25

Figured out how to do it, the data is in the form of a struct sockaddr_in*. After importing <arpa/inet.h>you can do the following:

struct sockaddr_in *addr = (struct sockaddr_in *)[address bytes];
NSString *IP = [NSString stringWithCString:inet_ntoa(addr->sin_addr) encoding:NSASCIIStringEncoding];

How to fetch address from CocoaAsyncUDPSocket

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