On Feb 10, 2009, at 7:44 PM, gumbo...@mac.com wrote:

I currently have a RealBasic application that manages a furnace temperature controller. Using the TCPSocket class in RB the app listens to a port and I can query this application from other computers on the LAN and set parameters of the temperature controller, by passing strings.

What I would like to be able to do, is the same thing from my iPhone with a Cocoa application. I have only 3 years experience with Cocoa and none with network comms.

Can someone please explain what would be the best way to achieve this and where I should start reading.

You can use NSStream objects, obtained from +getStreamsToHost:port:inputStream:outputStream:.

See the Stream Programming Guide for Cocoa: 
http://developer.apple.com/documentation/Cocoa/Conceptual/Streams/

Cheers,
Ken

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