As part of the mock up process I needed to get the XBee hooked up to the Teensy. The latest release of the Arduino IDE from PJRC has an updated XBee library that I needed to use. I keep forgetting to update the firmware of the XBee (I lent Elan a radio and configured it to his needs, I needed to reconfigure it to mine). The big issue was API=2 and the Router API firmware. It’s working great now except that my XBee configuration code is not working. The AT commands aren’t able to be processed correctly so I can’t determine the BAUD rate or the PANID for the radio programmatically. That’s the next issue to address. The good news is that I’m able to control the tower LEDs from the iPhone through the Teensy!