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Basic Arduino API Communication
Here are short tutorials to ensure your XBee's are communicating when hooked up to an Arduino.
Test Blink
This is a short tutorial to test if the Arduino receives a signal. Make sure the board's 13 pin LED light shown in the tutorial lights up.
https://www.norwegiancreations.com/2013/10/arduino-tutorial-1-lets-make-xbee-talk/