get SSID info

MasterViewController.m

#pragma mark - fetchSSID
- (id)fetchSSIDInfo {
    NSArray *ifs = (__bridge_transfer id) CNCopySupportedInterfaces();
    NSLog(@"Supported interfaces: %@", ifs);
    id info = nil;
    for (NSString *ifnam in ifs) {
        info = (__bridge_transfer id) CNCopyCurrentNetworkInfo((__bridge CFStringRef) ifnam);
        NSLog(@"%@ => %@", ifnam, info);
        if (info && [info count]) {break;}
    }
    return info;
}