Just FYI, photo
Olimex board. NXP LPC2106 ARM CPU.
XBee wired to 2nd serial port.
XBee carrier board.
Also have this on Olimex LPC2129 boards. I put in a jumper so serial port 2 on this board can be logic level or RS232 based on pluggable jumpers. So this board has CAN and RS232. Using the Binary API mode of the XBees.
Noob to ARMs, I found that the 2129 code will run verbatim on the 2106 (since the 2129 has less RAM). Convenient for debugging.