XBee is 2.4 GHz, but it is not WiFi or Bluetooth. There is no API for controlling iPod radio at this low level. If you want to talk to the XBee network, you need to connect through some kind of gateway device, which is located both in the XBee network and in one of the networks connected to the iPhone. It can be either the Internet, LAN, or through a physical connection to the dock connector.
If you like the hardware, you can create a device with an Ethernet jack and an XBee radio station, and then write iPhone software to talk to your gadget, which will send your messages to the XBee network.
Or you could build your node end devices to use WiFi directly, leaving XBee completely out of the equation.
Peter Bierman
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