Geoloqi provides a real-time streaming service through Websockets and Socket.IO.
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You can subscribe to the location updates for all users in a group by connecting to the streaming server and listening to the group token.
Using the framework from your link I was able to connect to the streaming server with the following:
socketIO = [[SocketIO alloc] initWithDelegate:self];
NSDictionary *groupWithToken = [NSDictionary dictionaryWithObjectsAndKeys:@"xxxxxx", @"group", nil];
socketIO.useSecure = YES;
[socketIO connectToHost:@"subscribe.geoloqi.com" onPort:443 withParams:groupWithToken];
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