The example code from Chapter 8 of my book, Professional iOS Network Programming. Further discussion is also available on the Wiley P2P forum.
The Low-Level Networking app communicates with a fake warehouse server that responds to telnet queries about the warehouse's current status and evironment conditions. A segmented control in the app allows the user to switch between three modes of communication:
- BSD sockets
- CFStream
- NSStream
Each different networking type is built to read the same telnet feed, so it is easy to do an apples-to-apples comparison between all three methods.
Although an example telnet server is not provided, the warehouse server is expected to return results in a comma-separated format:
84,60,+67,1,1,0,0,0,1
where the values mean
{room temperature},{outlet temperature},{coil temperature},{compressor status},{air switch status},{auxiliary heat status},{front door status},{system status},{alarm status}