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I'm unsure what you mean by "Socket.IO via an Obj-C lib". Could you send a link? It looks like Socket.IO is node (which I don't believe you can use in iOS).

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Here's a link to a socket.io client library in Obj-C:

https://github.com/pkyeck/socket.IO-objc

He means communicating with a Socket.IO server from Obj-C (most probably also using web sockets but speaking the Socket.IO protocol).

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